The TOSCA Simple Profile in YAML specifies a rendering of
TOSCA which aims to provide a more accessible syntax as well as a more concise
and incremental expressiveness of the TOSCA DSL in order to minimize the
learning curve and speed the adoption of the use of TOSCA to portably describe
cloud applications.
This proposal describes a YAML rendering for TOSCA. YAML is
a human friendly data serialization standard (http://yaml.org/)
with a syntax much easier to read and edit than XML. As there are a number of
DSLs encoded in YAML, a YAML encoding of the TOSCA DSL makes TOSCA more
accessible by these communities.
This proposal prescribes an isomorphic rendering in YAML of
a subset of the TOSCA v1.0 ensuring that TOSCA semantics are preserved and can
be transformed from XML to YAML or from YAML to XML. Additionally, in order to
streamline the expression of TOSCA semantics, the YAML rendering is sought to
be more concise and compact through the use of the YAML syntax.
The TOSCA metamodel uses the
concept of service templates to describe cloud workloads as a topology
template, which is a graph of node templates modeling the components a workload
is made up of and as relationship templates modeling the relations between
those components. TOSCA further provides a type system of node types to
describe the possible building blocks for constructing a service template, as
well as relationship type to describe possible kinds of relations. Both node
and relationship types may define lifecycle operations to implement the
behavior an orchestration engine can invoke when instantiating a service
template. For example, a node type for some software product might provide a
‘create’ operation to handle the creation of an instance of a component at runtime,
or a ‘start’ or ‘stop’ operation to handle a start or stop event triggered by
an orchestration engine. Those lifecycle operations are backed by
implementation artifacts such as scripts or Chef recipes that implement the
actual behavior.
An orchestration engine
processing a TOSCA service template uses the mentioned lifecycle operations to
instantiate single components at runtime, and it uses the relationship between
components to derive the order of component instantiation. For example, during
the instantiation of a two-tier application that includes a web application
that depends on a database, an orchestration engine would first invoke the
‘create’ operation on the database component to install and configure the
database, and it would then invoke the ‘create’ operation of the web
application to install and configure the application (which includes
configuration of the database connection).
The TOSCA simple profile
assumes a number of base types (node types and relationship types) to be
supported by each compliant environment such as a ‘Compute’ node type, a
‘Network’ node type or a generic ‘Database’ node type (see Appendix C). Furthermore, it is envisioned that a large number of additional types for use in
service templates will be defined by a community over time. Therefore, template
authors in many cases will not have to define types themselves but can simply
start writing service templates that use existing types. In addition, the
simple profile will provide means for easily customizing existing types, for
example by providing a customized ‘create’ script for some software.
3
A “hello world” template for TOSCA Simple Profile in YAML
As mentioned before, the TOSCA
simple profile assumes the existence of a small set of pre-defined, normative set
of node types (e.g., a ‘Compute’ node) along with other types, which will be
introduced through the course of this document, for creating TOSCA Service Templates.
It is envisioned that many additional node types for building service templates
will be created by communities some may be published as profiles that build
upon the TOSCA Simple Profile specification. Using the normative TOSCA Compute
node type, a very basic “Hello World” TOSCA template for deploying just a
single server would look as follows:
Example
1 - TOSCA Simple "Hello World"
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: Template for
deploying a single server with predefined properties.
topology_template:
node_templates:
my_server:
type: tosca.nodes.Compute
capabilities:
#
Host container properties
host:
properties:
num_cpus:
1
disk_size: 10 GB
mem_size:
4 MB
# Guest Operating System properties
os:
properties:
#
host Operating System image properties
architecture:
x86_64
type: linux
distribution: rhel
version:
6.5
|
The template above contains a very simple topology
template with only a single ‘Compute’ node template that declares some basic values
for properties within two of the several capabilities that are built into the
Compute node type definition. All TOSCA Orchestrators are expected to know how
to instantiate a Compute node since it is normative and expected to represent a
well-known function that is portable across TOSCA implementations. This
expectation is true for all normative TOSCA Node and Relationship types that
are defined in the Simple Profile specification. This means, with TOSCA’s
approach, that the application developer does not need to provide any
deployment or implementation artifacts that contain code or logic to
orchestrate these common software components. TOSCA orchestrators simply select
or allocate the correct node (resource) type that fulfils the application
topologies requirements using the properties declared in the node and its
capabilities.
In the above example, the “host”
capability contains properties that allow application developers to optionally
supply the number of CPUs, memory size and disk size they believe they need
when the Compute node is instantiated in order to run their applications.
Similarly, the “os” capability is used to provide values to
indicate what host operating system the Compute node should have when it is
instantiated.
The logical diagram of the “hello world” Compute node would
look as follows:
As you can see, the Compute
node also has attributes and other built-in capabilities, such as Bindable and Endpoint, each with additional properties
that will be discussed in other examples later in this document. Although the
Compute node has no direct properties apart from those in its capabilities,
other TOSCA node type definitions may have properties that are part of the node
type itself in addition to having Capabilities. TOSCA orchestration engines are
expected to validate all property values provided in a node template against
the property definitions in their respective node type definitions referenced
in the service template. The tosca_definitions_version
keyname in the TOSCA service template identifies the versioned set of
normative TOSCA type definitions to use for validating those types defined in
the TOSCA Simple Profile including the Compute node type. Specifically, the
value tosca_simple_yaml_1_0_0 indicates
Simple Profile v1.0.0 definitions would be used for validation. Other type
definitions may be imported from other service templates using the import keyword discussed later.
Typically, one would want to
allow users to customize deployments by providing input parameters instead of
using hardcoded values inside a template. In addition, output values are
provided to pass information that perhaps describes the state of the deployed template
to the user who deployed it (such as the private IP address of the deployed
server). A refined service template with corresponding inputs and outputs
sections is shown below.
Example 2 - Template with input and output parameter sections
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: Template for
deploying a single server with predefined properties.
topology_template:
inputs:
cpus:
type: integer
description: Number of CPUs
for the server.
constraints:
- valid_values: [ 1, 2, 4,
8 ]
node_templates:
my_server:
type: tosca.nodes.Compute
capabilities:
# Host container properties
host:
properties:
# Compute properties
num_cpus: { get_input:
cpus }
mem_size: 4 MB
disk_size: 10 GB
outputs:
server_ip:
description: The private IP
address of the provisioned server.
value: { get_attribute: [
my_server, private_address ] }
|
The inputs and outputs
sections are contained in the topology_template
element of the TOSCA template, meaning that they are scoped to node templates
within the topology template. Input parameters defined in the inputs section
can be assigned to properties of node template within the containing topology
template; output parameters can be obtained from attributes of node templates
within the containing topology template.
Note that the inputs section of a
TOSCA template allows for defining optional constraints on each input parameter
to restrict possible user input. Further note that TOSCA provides for a set of
intrinsic functions like get_input, get_property
or get_attribute to reference elements within the template or
to retrieve runtime values.
4
TOSCA template for a simple software installation
Software installations can be modeled in TOSCA as node
templates that get related to the node template for a server on which the
software shall be installed. With a number of existing software node types
(e.g. either created by the TOSCA work group or a community) template authors
can just use those node types for writing service templates as shown below.
Example 3 - Simple (MySQL) software installation on a TOSCA Compute node
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: Template for
deploying a single server with MySQL software on top.
topology_template:
inputs:
# omitted here for brevity
node_templates:
mysql:
type: tosca.nodes.DBMS.MySQL
properties:
root_password: {
get_input: my_mysql_rootpw }
port: { get_input:
my_mysql_port }
requirements:
- host: db_server
db_server:
type: tosca.nodes.Compute
capabilities:
# omitted here for brevity
|
The example above makes use of a node type tosca.nodes.DBMS.MySQL
for the mysql node template to install MySQL on a
server. This node type allows for setting a property root_password
to adapt the password of the MySQL root user at deployment. The
set of properties and their schema has been defined in the node type definition.
By means of the get_input function, a value provided by the user at
deployment time is used as value for the root_password property. The
same is true for the port property.
The mysql node template is related to the db_server node template (of type tosca.nodes.Compute) via the requirements section to indicate where
MySQL is to be installed. In the TOSCA metamodel, nodes get related to each
other when one node has a requirement against some feature provided by another
node. What kinds of requirements exist is defined by the respective node type.
In case of MySQL, which is software that needs to be installed or hosted on a
compute resource, the underlying node type named DBMS has a predefined requirement called host, which needs to be fulfilled by
pointing to a node template of type tosca.nodes.Compute.
The
logical relationship between the mysql
node and its host db_server node would
appear as follows:
Within the requirements section, all entries simple
entries are a map which contains the symbolic name of a requirement definition as
the key and the identifier of the fulfilling node as the value. The
value is essentially the symbolic name of the other node template; specifically,
or the example above, the host
requirement is fulfilled by referencing the db_server
node template. The underlying TOSCA DBMS
node type already defines a complete requirement definition for the host requirement of type Container and assures that a HostedOn TOSCA relationship will
automatically be created and will only allow a valid target host node is of
type Compute. This approach allows the
template author to simply provide the name of a valid Compute node (i.e., db_server) as the value for the mysql node’s host requirement and not worry about defining
anything more complex if they do not want to.
Node types in TOSCA have
associated implementations that provide the automation (e.g. in the form of scripts
such as Bash, Chef or Python) for the normative lifecycle operations of a node.
For example, the node type implementation for a MySQL database would associate
scripts to TOSCA node operations like configure,
start, or stop to manage the state of MySQL at runtime.
Many node types may already
come with a set of operational scripts that contain basic commands that can
manage the state of that specific node. If it is desired, template authors can
provide a custom script for one or more of the operation defined by a node type
in their node template which will override the default implementation in the
type. The following example shows a mysql
node template where the template author provides their own configure script:
Example 4 - Node Template overriding its Node Type's "configure" interface
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: Template for
deploying a single server with MySQL software on top.
topology_template:
inputs:
# omitted here for brevity
node_templates:
mysql:
type: tosca.nodes.DBMS.MySQL
properties:
root_password: {
get_input: my_mysql_rootpw }
port: { get_input:
my_mysql_port }
requirements:
- host: db_server
interfaces:
Standard:
configure: scripts/my_own_configure.sh
db_server:
type: tosca.nodes.Compute
capabilities:
# omitted here for brevity
|
In the example above, the my_own_configure.sh
script is provided for the configure operation of
the MySQL node type’s Standard lifecycle interface. The path
given in the example above (i.e., ‘scripts/’) is interpreted relative to the
template file, but it would also be possible to provide an absolute URI to the
location of the script.
In other words, operations
defined by node types can be thought of as “hooks” into which automation can be
injected. Typically, node type implementations provide the automation for those
“hooks”. However, within a template, custom automation can be injected to run
in a hook in the context of the one, specific node template (i.e. without
changing the node type).
In the example shown in section
4 the deployment of the MySQL middleware
only, i.e. without actual database content was shown. The following example shows
how such a template can be extended to also contain the definition of custom
database content on-top of the MySQL DBMS software.
Example 5 - Template for deploying database content on-top of MySQL DBMS middleware
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: Template for
deploying MySQL and database content.
topology_template:
inputs:
# omitted here for brevity
node_templates:
my_db:
type:
tosca.nodes.Database.MySQL
properties:
name: { get_input:
database_name }
user: { get_input:
database_user }
password: { get_input:
database_password }
port: { get_input:
database_port }
artifacts:
db_content:
implementation: files/my_db_content.txt
type:
tosca.artifacts.File
requirements:
- host: mysql
interfaces:
Standard:
create:
implementation:
db_create.sh
inputs:
# Copy DB file
artifact to server’s staging area
db_data: { get_artifact: [
SELF, db_content ] }
mysql:
type: tosca.nodes.DBMS.MySQL
properties:
root_password: {
get_input: mysql_rootpw }
port: { get_input:
mysql_port }
requirements:
- host: db_server
db_server:
type: tosca.nodes.Compute
capabilities:
# omitted here for brevity
|
In the example above, the my_db
node template or type tosca.nodes.Database.MySQL represents an
actual MySQL database instance managed by a MySQL DBMS installation. The requirements
section of the my_db node template expresses that the database
it represents is to be hosted on a MySQL DBMS node template named mysql
which is also declared in this template.
In its artifacts section of the my_db
the node template, there is an artifact definition named db_content
which represents a text file my_db_content.txt which
in turn will be used to add content to the SQL database as part of the create
operation. The requirements section of the my_db node template
expresses that the database is hosted on a MySQL DBMS represented by the mysql
node.
As you can see above, a script is associated with the create
operation with the name db_create.sh.
The TOSCA Orchestrator sees that this is not a named artifact declared in the
node’s artifact section, but instead a filename for a normative TOCA
implementation artifact script type (i.e., tosca.artifacts.Implementation.Bash).
Since this is an implementation type for TOSCA, the orchestrator will execute
the script automatically to create the node on db_server, but first it will prepare the
local environment with the declared inputs for the operation. In this case, the
orchestrator would see that the db_data
input is using the get_artifact
function to retrieve the file (my_db_content.txt)
which is associated with the db_content
artifact name prior to executing the db_create.sh
script.
The logical diagram for this example would appear as follows:
Note that while it would be
possible to define one node type and corresponding node templates that
represent both the DBMS middleware and actual database content as one entity,
TOSCA normative node types distinguish between middleware (container) and
application (containee) node types. This allows on one hand to have better
re-use of generic middleware node types without binding them to content running
on top of them, and on the other hand this allows for better substitutability
of, for example, middleware components like a DBMS during the deployment of
TOSCA models.
The definition of multi-tier
applications in TOSCA is quite similar to the example shown in section 4, with the only difference that multiple software node stacks (i.e., node templates for
middleware and application layer components), typically hosted on different
servers, are defined and related to each other. The example below defines a web
application stack hosted on the web_server
“compute” resource, and a database software stack similar to the one shown
earlier in section 6 hosted on the db_server
compute resource.
Example 6 - Basic two-tier application (web application and database server tiers)
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: Template for
deploying a two-tier application servers on two
topology_template:
inputs:
# Admin user name and password
to use with the WordPress application
wp_admin_username:
type: string
wp_admin_password:
type: string
wp_db_name:
type: string
wp_db_user:
type: string
wp_db_password:
type: string
wp_db_port:
type: integer
mysql_root_password:
type: string
mysql_port:
type: integer
context_root:
type: string
node_templates:
wordpress:
type:
tosca.nodes.WebApplication.WordPress
properties:
context_root: { get_input:
context_root }
admin_user: { get_input:
wp_admin_username }
admin_password: {
get_input: wp_admin_password }
db_host: { get_attribute:
[ db_server, private_address ] }
requirements:
- host: apache
- database_endpoint:
wordpress_db
interfaces:
Standard:
inputs:
db_host: { get_attribute:
[ db_server, private_address ] }
db_port: {
get_property: [ wordpress_db, port ] }
db_name: {
get_property: [ wordpress_db, name ] }
db_user: {
get_property: [ wordpress_db, user ] }
db_password: {
get_property: [ wordpress_db, password ] }
apache:
type:
tosca.nodes.WebServer.Apache
properties:
# omitted here for brevity
requirements:
- host: web_server
web_server:
type: tosca.nodes.Compute
capabilities:
# omitted here for brevity
wordpress_db:
type:
tosca.nodes.Database.MySQL
properties:
name: { get_input:
wp_db_name }
user: { get_input:
wp_db_user }
password: { get_input:
wp_db_password }
port: { get_input:
wp_db_port }
requirements:
- host: mysql
mysql:
type: tosca.nodes.DBMS.MySQL
properties:
root_password: {
get_input: mysql_root_password }
port: { get_input:
mysql_port }
requirements:
- host: db_server
db_server:
type: tosca.nodes.Compute
capabilities:
# omitted here for brevity
|
The web application stack
consists of the wordpress, the apache and the web_server
node templates. The wordpress node template represents a custom web
application of type tosca.nodes.WebApplication.WordPress which is hosted
on an Apache web server represented by the apache node template. This
hosting relationship is expressed via the host entry in the requirements
section of the wordpress node template. The apache node template,
finally, is hosted on the web_server compute node.
The database stack consists of the wordpress_db, the mysql
and the db_server node templates. The wordpress_db node
represents a custom database of type tosca.nodes.Database.MySQL which is
hosted on a MySQL DBMS represented by the mysql node template. This
node, in turn, is hosted on the db_server compute node.
The wordpress node requires a connection to the
wordpress_db node, since the WordPress application needs a database to
store its data in. This relationship is established through the database_endpoint
entry in the requirements section of the wordpress node template’s
declared node type. For configuring the WordPress web application, information
about the database to connect to is required as input to the configure
operation. Therefore, the input parameters are defined and values for them are retrieved
from the properties and attributes of the wordpress_db node via the get_property
and get_attribute functions. In the above example, these inputs
are defined at the interface-level and would be available to all operations of
the Standard interface (i.e., the tosca.interfaces.node.lifecycle.Standard
interface) within the wordpress node template and not just the
configure operation.
In previous examples, the
template author did not have to think about explicit relationship types to be
used to link a requirement of a node to another node of a model, nor did the
template author have to think about special logic to establish those links. For
example, the host requirement
in previous examples just pointed to another node template and based on metadata
in the corresponding node type definition the relationship type to be
established is implicitly given.
In some cases it might be
necessary to provide special processing logic to be executed when establishing
relationships between nodes at runtime. For example, when connecting the
WordPress application from previous examples to the MySQL database, it might be
desired to apply custom configuration logic in addition to that already
implemented in the application node type. In such a case, it is possible for
the template author to provide a custom script as implementation for an
operation to be executed at runtime as shown in the following example.
Example 7 – Providing a custom relationship script to establish a connection
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description:
Template for deploying a two-tier application on two servers.
topology_template:
inputs:
# omitted here for brevity
node_templates:
wordpress:
type: tosca.nodes.WebApplication.WordPress
properties:
# omitted here for brevity
requirements:
- host: apache
- database_endpoint:
node: wordpress_db
relationship: my_custom_database_connection
wordpress_db:
type: tosca.nodes.Database.MySQL
properties:
# omitted here for the brevity
requirements:
- host: mysql
relationship_templates:
my_custom_database_connection:
type: ConnectsTo
interfaces:
Configure:
pre_configure_source: scripts/wp_db_configure.sh
# other resources not shown for this example ...
|
The node type definition for the wordpress
node template is WordPress which declares the complete database_endpoint
requirement definition. This database_endpoint
declaration indicates it must be fulfilled by any node template that provides an
Endpoint.Database Capability Type using a ConnectsTo
relationship. The wordpress_db node template’s underlying MySQL
type definition indeed provides the Endpoint.Database Capability
type. In this example however, no explicit relationship template is declared;
therefore TOSCA orchestrators would automatically create a ConnectsTo
relationship to establish the link between the wordpress
node and the wordpress_db node at runtime.
The ConnectsTo relationship (see C.5.4) also provides a
default Configure interface with
operations that optionally get executed when the orchestrator establishes the
relationship. In the above example, the author has provided the custom script wp_db_configure.sh to be executed for
the operation called pre_configure_source.
The script file is assumed to be located relative to the referencing service
template such as a relative directory within the TOSCA Cloud Service Archive (CSAR)
packaging format. This approach allows for conveniently hooking in custom
behavior without having to define a completely new derived relationship type.
In the previous section it was
shown how custom behavior can be injected by specifying scripts inline in the
requirements section of node templates. When the same custom behavior is
required in many templates, it does make sense to define a new relationship
type that encapsulates the custom behavior in a re-usable way instead of
repeating the same reference to a script (or even references to multiple
scripts) in many places.
Such a custom relationship type
can then be used in templates as shown in the following example.
Example 8 – A web application Node Template requiring a custom database connection type
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: Template for
deploying a two-tier application on two servers.
topology_template:
inputs:
# omitted here for brevity
node_templates:
wordpress:
type: tosca.nodes.WebApplication.WordPress
properties:
# omitted here for brevity
requirements:
- host: apache
- database_endpoint:
node: wordpress_db
relationship: my.types.WordpressDbConnection
wordpress_db:
type:
tosca.nodes.Database.MySQL
properties:
# omitted here for the
brevity
requirements:
- host: mysql
# other resources not shown here
...
|
In the example above, a special relationship type my.types.WordpressDbConnection
is specified for establishing the link between the wordpress node and the
wordpress_db
node through the use of the relationship (keyword) attribute in the database
reference. It is assumed, that this special relationship type provides some
extra behavior (e.g., an operation with a script) in addition to what a generic
“connects to” relationship would provide. The definition of this custom
relationship type is shown in the following section.
The following YAML snippet shows the definition of the
custom relationship type used in the previous section. This type derives from
the base “ConnectsTo” and overrides one operation defined by that base
relationship type. For the pre_configure_source
operation defined in the Configure
interface of the ConnectsTo relationship type, a script implementation is
provided. It is again assumed that the custom configure script is located at a
location relative to the referencing service template, perhaps provided in some
application packaging format (e.g., the TOSCA Cloud Service Archive (CSAR)
format).
Example 9 - Defining a custom relationship type
|
tosca_definitions_version: tosca_simple_yaml_1_0_0
description: Definition of custom
WordpressDbConnection relationship type
relationship_types:
my.types.WordpressDbConnection:
derived_from: tosca.relationships.ConnectsTo
interfaces:
Configure:
pre_configure_source:
scripts/wp_db_configure.sh
|
In the above example, the Configure
interface is the specified alias or shorthand name for the TOSCA interface type
with the full name of tosca.interfaces.relationship.Configure
which is defined in the appendix.
In some cases it can be
necessary to define a generic dependency between two nodes in a template to
influence orchestration behavior, i.e. to first have one node processed before
another dependent node gets processed. This can be done by using the generic dependency requirement which is defined
by the TOSCA Root Node Type and thus gets
inherited by all other node types in TOSCA (see section C.7.1).
Example 10 - Simple dependency relationship between two nodes
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: Template with a
generic dependency between two nodes.
topology_template:
inputs:
# omitted here for brevity
node_templates:
my_app:
type: my.types.MyApplication
properties:
# omitted here for brevity
requirements:
- dependency: some_service
some_service:
type: some.nodetype.SomeService
properties:
# omitted here for brevity
|
As in previous examples, the relation that one node
depends on another node is expressed in the requirements section using
the built-in requirement named dependency that exists for all node types
in TOSCA. Even if the creator of the MyApplication node type did
not define a specific requirement for SomeService (similar to the database
requirement in the example in section 8), the template author who knows that
there is a timing dependency and can use the generic dependency
requirement to express that constraint using the very same syntax as used for
all other references.
In TOSCA templates, nodes are either:
·
Concrete: meaning that they have a deployment and/or one
or more implementation artifacts that are declared on the “create” operation of
the node’s Standard lifecycle interface, or they are
·
Abstract: where the template describes the node type along
with its required capabilities and properties that must be satisfied.
TOSCA Orchestrators, by default, when finding an abstract
node in TOSCA Service Template during deployment will attempt to “select” a
concrete implementation for the abstract node type that best matches and
fulfills the requirements and property constraints the template author provided
for that abstract node. The concrete implementation of the node could be
provided by another TOSCA Service Template (perhaps located in a catalog or repository
known to the TOSCA Orchestrator) or by an existing resource or service
available within the target Cloud Provider’s platform that the TOSCA
Orchestrator already has knowledge of.
TOSCA supports two methods for template authors to express
requirements for an abstract node within a TOSCA service template.
1. Using
a target node_filter: where a node template can describe a requirement
(relationship) for another node without including it in the topology. Instead,
the node provides a node_filter to describe the target node type along with its
capabilities and property constrains
2. Using
an abstract node template: that describes the abstract node’s type
along with its property constraints and any requirements and capabilities it
also exports. This first method you have already seen in examples from
previous chapters where the Compute node is abstract and selectable by the
TOSCA Orchestrator using the supplied Container and OperatingSystem
capabilities property constraints.
These approaches allows architects and developers to create
TOSCA service templates that are composable and can be reused by allowing
flexible matching of one template’s requirements to another’s capabilities.
Examples of both these approaches are shown below.
Using TOSCA, it is possible to
define only the software components of an application in a template and just
express constrained requirements against the hosting infrastructure. At
deployment time, the provider can then do a late binding and dynamically
allocate or assign the required hosting infrastructure and place software
components on top.
This example shows how a single
software component (i.e., the mysql node template) can define its host requirements that the TOSCA Orchestrator
and provider will use to select or allocate an appropriate host Compute node by using matching criteria
provided on a node_filter.
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: Template with
requirements against hosting infrastructure.
topology_template:
inputs:
# omitted here for brevity
node_templates:
mysql:
type: tosca.nodes.DBMS.MySQL
properties:
# omitted here for brevity
requirements:
- host:
node_filter:
capabilities:
# Constraints for
selecting “host” (Container Capability)
- host
properties:
- num_cpus:
{ in_range: [ 1, 4 ] }
- mem_size:
{ greater_or_equal: 2 GB }
# Constraints for
selecting “os” (OperatingSystem Capability)
- os:
properties:
-
architecture: { equal: x86_64 }
- type:
linux
-
distribution: ubuntu
|
In the example above, the mysql component contains
a host requirement for a node of type Compute
which it inherits from its parent DBMS node type definition; however, there is
no declaration or reference to any node template of type Compute.
Instead, the mysql node template augments the abstract “host”
requirement with a node_filter which contains additional
selection criteria (in the form of property constraints that the provider must
use when selecting or allocating a host Compute node.
Some of the constraints shown above narrow down the boundaries
of allowed values for certain properties such as mem_size
or num_cpus for the “host” capability by
means of qualifier functions such as greater_or_equal. Other constraints,
express specific values such as for the architecture or
distribution properties of the “os” capability which
will require the provider to find a precise match.
Note that when no qualifier function
is provided for a property (filter), such as for the distribution property, it is interpreted to
mean the equal operator as shown on the
architecture property.
11.2 Using an abstract
node template to define infrastructure requirements for software
This previous approach works well if no other
component (i.e., another node template) other than mysql
node template wants to reference the same Compute node the
orchestrator would instantiate. However, perhaps another component wants to
also be deployed on the same host, yet still allow the flexible matching
achieved using a node-filter. The alternative to the above approach is to
create an abstract node template that represents the Compute
node in the topology as follows:
|
tosca_definitions_version: tosca_simple_yaml_1_0_0
description: Template with requirements against hosting
infrastructure.
topology_template:
inputs:
# omitted here for brevity
node_templates:
mysql:
type: tosca.nodes.DBMS.MySQL
properties:
# omitted here for brevity
requirements:
- host: mysql_compute
mysql_compute:
type: Compute
capabilities:
host:
properties:
num_cpus: { equal: 2 }
mem_size: { greater_or_equal: 2 GB }
os:
properties:
architecture: { equal: x86_64 }
type: linux
distribution: ubuntu
|
As you can see the resulting mysql_compute
node template looks very much like the “hello
world” template as shown in Chapter 3 (where the Compute
node template was abstract), but this one also allows the TOSCA orchestrator
more flexibility when “selecting” a host Compute node by
providing flexible constraints for properties like mem_size.
As we proceed, you will see that TOSCA provides many
normative node types like Compute for
commonly found services (e.g., BlockStorage,
WebServer, Network, etc.). When these TOSCA normative
node types are used in your application’s topology they are always assumed to
be “selectable” by TOSCA Orchestrators which work with target infrastructure
providers to find or allocate the best match for them based upon your
application’s requirements and constraints.
In the same way requirements
can be defined on the hosting infrastructure (as shown above) for an
application, it is possible to express requirements against application or
middleware components such as a database that is not defined in the same
template. The provider may then allocate a database by any means, (e.g. using a
database-as-a-service solution).
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: Template with a
database requirement.
topology_template:
inputs:
# omitted here for brevity
node_templates:
my_app:
type: my.types.MyApplication
properties:
admin_user: { get_input:
admin_username }
admin_password: {
get_input: admin_password }
db_endpoint_url: { get_property:
[SELF, database_endpoint, url_path ] }
requirements:
- database_endpoint:
node: my.types.nodes.MyDatabase
node_filter:
properties:
- db_version: {
greater_or_equal: 5.5 }
|
In the example above, the application my_app
requires a database node of type MyDatabase which has a db_version
property value of greater_or_equal to the value 5.5.
This example also shows how the get_property
intrinsic function can be used to retrieve the url_path
property from the database node that will be selected by the provider and
connected to my_app at runtime due to fulfillment of the database_endpoint
requirement. To locate the property, the get_property’s first argument is set
to the keyword SELF which indicates the property is being
referenced from something in the node itself. The second parameter is the name
of the requirement named database_endpoint which contains the property are
looking for. The last argument is the name of the property itself (i.e., url_path)
which contains the value we want to retrieve and assign to db_endpoint_url.
From
an application perspective, it is often not necessary or desired to dive into
platform details, but the platform/runtime for an application is abstracted. In
such cases, the template for an application can use generic representations of
platform components. The details for such platform components, such as the
underlying hosting infrastructure at its configuration, can then be defined in
separate template files that can be used for substituting the more abstract
representations in the application level template file.
When
a topology template is instantiated by a TOSCA Orchestrator, the orchestrator
has to look for realizations of the single node templates according to the node
types specified for each node template. Such realizations can either be node
types that include the appropriate implementation artifacts and deployment
artifacts that can be used by the orchestrator to bring to life the real-world
resource modeled by a node template. Alternatively, separate topology templates
may be annotated as being suitable for realizing a node template in the
top-level topology template.
In
the latter case, a TOSCA Orchestrator will use additional substitution mapping
information provided as part of the substituting topology templates to derive
how the substituted part get “wired” into the overall deployment, for example,
how capabilities of a node template in the top-level topology template get
bound to capabilities of node templates in the substituting topology template.
Thus,
in cases where no “normal” node type implementation is available, or the node
type corresponds to a whole subsystem that cannot be implemented as a single
node, additional topology templates can be used for filling in more abstract
placeholders in top level application templates.
The
following sample defines a web application web_app
connected to a database db.
In this example, the complete hosting stack for the application is defined
within the same topology template: the web application is hosted on a web
server web_server, which in turn is
installed (hosted) on a compute node server.
The hosting stack for the
database db, in contrast, is not
defined within the same file but only the database is represented as a node
template of type tosca.nodes.Database.
The underlying hosting stack for the database is defined in a separate template
file, which is shown later in this section. Within the current template, only a
number of properties (user, password, name)
are assigned to the database using hardcoded values in this simple example.
Figure 1: Using template substitution to implement a database tier
When a node template is to be
substituted by another service template, this has to be indicated to an
orchestrator by means of a special “substitutable” directive. This directive
causes, for example, special processing behavior when validating the left-hand
service template in Figure 1. The hosting requirement of the db node template is not bound to any
capability defined within the service template, which would normally cause a
validation error. When the “substitutable” directive is present, the
orchestrator will however first try to perform substitution of the respective
node template and after that validate if all mandatory requirements of all
nodes in the resulting graph are fulfilled.
Note that in contrast to the
use case described in section 0 (where a database was abstractly referred to in
the requirements section of a node and
the database itself was not represented as a node template), the approach shown
here allows for some additional modeling capabilities in cases where this is
required.
For example, if multiple components shall use the same database (or any other
sub-system of the overall service), this can be expressed by means of normal
relations between node templates, whereas such modeling would not be possible
in requirements sections of disjoint
node templates.
tosca_definitions_version:
tosca_simple_yaml_1_0
topology_template:
description: Template of an application connecting to a database.
node_templates:
web_app:
type: tosca.nodes.WebApplication.MyWebApp
requirements:
- host: web_server
- database_endpoint: db
web_server:
type: tosca.nodes.WebServer
requirements:
- host: server
server:
type: tosca.nodes.Compute
# details omitted for brevity
db:
# This node is abstract (no Deploment or Implemenation artifacts on create)
# and can be substituted with a topology provided by another template
# that exports a Database type’s capabilities.
type: tosca.nodes.Database
properties:
user: my_db_user
password: secret
name: my_db_name
|
The following sample defines a template for a
database including its complete hosting stack, i.e. the template includes a database
node template, a template for the database management system (dbms)
hosting the database, as well as a computer node server
on which the DBMS is installed.
This service template can be used standalone for deploying
just a database and its hosting stack. In the context of the current use case,
though, this template can also substitute the database node template in the
previous snippet and thus fill in the details of how to deploy the database.
In order to enable such a substitution, an additional metadata
section substitution_mappings is added
to the topology template to tell a TOSCA Orchestrator how exactly the topology
template will fit into the context where it gets used. For example,
requirements or capabilities of the node that gets substituted by the topology
template have to be mapped to requirements or capabilities of internal node
templates for allow for a proper wiring of the resulting overall graph of node
templates.
In short, the substitution_mappings
section provides the following information:
1. It
defines what node templates, i.e. node templates of which type, can be
substituted by the topology template.
2. It
defines how capabilities of the substituted node (or the capabilities defined
by the node type of the substituted node template, respectively) are bound to
capabilities of node templates defined in the topology template.
3. It
defines how requirements of the substituted node (or the requirements defined
by the node type of the substituted node template, respectively) are bound to
requirements of node templates defined in the topology template.
Figure 2: Substitution mappings
The substitution_mappings
section in the sample below denotes that this topology template can be used for
substituting node templates of type tosca.nodes.Database.
It further denotes that the database_endpoint
capability of the substituted node gets fulfilled by the database_endpoint
capability of the database node contained in the topology
template.
tosca_definitions_version:
tosca_simple_yaml_1_0
topology_template:
description: Template of a database including its hosting stack.
inputs:
db_user:
type: string
db_password:
type: string
# other inputs omitted for brevity
substitution_mappings:
node_type: tosca.nodes.Database
capabilities:
database_endpoint: [ database, database_endpoint ]
node_templates:
database:
type: tosca.nodes.Database
properties:
user: { get_input: db_user }
# other properties omitted for brevity
requirements:
- host: dbms
dbms:
type: tosca.nodes.DBMS
# details omitted for brevity
server:
type: tosca.nodes.Compute
# details omitted for brevity
|
Note that the substitution_mappings
section does not define any mappings for requirements of the Database node
type, since all requirements are fulfilled by other nodes templates in the
current topology template. In cases where a requirement of a substituted node
is bound in the top-level service template as well as in the substituting topology
template, a TOSCA Orchestrator SHOULD raise a validation error.
Further note that no mappings for properties or attributes
of the substituted node are defined. Instead, the inputs and outputs defined by
the topology template have to match the properties and attributes or the
substituted node. If there are more inputs than the substituted node has
properties, default values must be defined for those inputs, since no values
can be assigned through properties in a substitution case.
A common use case when providing an end-to-end service is to
define a chain of several subsystems that together implement the overall
service. Those subsystems are typically defined as separate service templates
to (1) keep the complexity of the end-to-end service template at a manageable
level and to (2) allow for the re-use of the respective subsystem templates in
many different contexts. The type of subsystems may be specific to the targeted
workload, application domain, or custom use case. For example, a company or a
certain industry might define a subsystem type for company- or industry
specific data processing and then use that subsystem type for various end-user
services. In addition, there might be generic subsystem types like a database
subsystem that are applicable to a wide range of use cases.
Figure 3 shows the chaining of three subsystem types – a
message queuing subsystem, a transaction processing subsystem, and a databank
subsystem – that support, for example, an online booking application. On the
front end, this chain provides a capability of receiving messages for handling
in the message queuing subsystem. The message queuing subsystem in turn requires
a number of receivers, which in the current example are two transaction
processing subsystems. The two instances of the transaction processing
subsystem might be deployed on two different hosting infrastructures or
datacenters for high-availability reasons. The transaction processing
subsystems finally require a database subsystem for accessing and storing
application specific data. The database subsystem in the backend does not
require any further component and is therefore the end of the chain in this
example.
Figure 3: Chaining of subsystems in a service template
All of the node templates in the service template shown
above are abstract and considered substitutable where each can be treated as
their own subsystem; therefore, when instantiating the overall service, the
orchestrator would realize each substitutable node template using other TOSCA
service templates. These service templates would include more nodes and
relationships that include the details for each subsystem. A simplified version
of a TOSCA service template for the overall service is given in the following
listing.
tosca_definitions_version:
tosca_simple_yaml_1_0
topology_template:
description: Template of online transaction processing service.
node_templates:
mq:
type: example.QueuingSubsystem
properties:
# properties omitted for brevity
capabilities:
message_queue_endpoint:
# details omitted for brevity
requirements:
- receiver: trans1
- receiver: trans2
trans1:
type: example.TransactionSubsystem
properties:
mq_service_ip: { get_attribute: [ mq, service_ip ] }
receiver_port: 8080
capabilities:
message_receiver:
# details omitted for brevity
requirements:
- database_endpoint: dbsys
trans2:
type: example.TransactionSubsystem
properties:
mq_service_ip: { get_attribute: [ mq, service_ip ] }
receiver_port: 8080
capabilities:
message_receiver:
# details omitted for brevity
requirements:
- database_endpoint: dbsys
dbsys:
type: example.DatabaseSubsystem
properties:
# properties omitted for brevity
capabilities:
database_endpoint:
# details omitted for brevity
|
As can be seen in the example above, the subsystems are
chained to each other by binding requirements of one subsystem node template to
other subsystem node templates that provide the respective capabilities. For
example, the receiver requirement of
the message queuing subsystem node template mq
is bound to transaction processing subsystem node templates trans1 and trans2.
Subsystems can be parameterized by providing properties. In
the listing above, for example, the IP address of the message queuing server is
provided as property mq_service_ip to
the transaction processing subsystems and the desired port for receiving
messages is specified by means of the receiver_port
property.
If attributes of the instantiated subsystems shall be
obtained, this would be possible by using the get_attribute
intrinsic function on the respective subsystem node templates.
The types of subsystems that are required for a certain
end-to-end service are defined as TOSCA node types as shown in the following
example. Node templates of those node types can then be used in the end-to-end
service template to define subsystems to be instantiated and chained for
establishing the end-to-end service.
The realization of the defined node type will be given in
the form of a whole separate service template as outlined in the following
section.
tosca_definitions_version:
tosca_simple_yaml_1_0
node_types:
example.TransactionSubsystem:
properties:
mq_service_ip:
type: string
receiver_port:
type: integer
attributes:
receiver_ip:
type: string
receiver_port:
type: integer
capabilities:
message_receiver: tosca.capabilities.Endpoint
requirements:
- database_endpoint: tosca.capabilities.Endpoint.Database
|
Configuration parameters that shall be allowed for
customizing the instantiation of any subsystem are defined as properties of the
node type. In the current example, those are the properties mq_service_ip and receiver_port that had been used in the
end-to-end service template in section 13.1.
Observable attributes of the
resulting subsystem instances are defined as attributes of the node type. In
the current case, those are the IP address of the message receiver as well as
the actually allocated port of the message receiver endpoint.
The details of a subsystem, i.e. the software components and
their hosting infrastructure, are defined as node templates and relationships
in a service template. By means of substitution mappings that have been
introduced in section 12.2, the service template is annotated to indicate to an
orchestrator that it can be used as realization of a node template of certain
type, as well as how characteristics of the node type are mapped to internal
elements of the service template.
Figure 4: Defining subsystem details in a service
template
Figure 1 illustrates how a transaction processing subsystem
as outlined in the previous section could be defined in a service template. In
this example, it simply consists of a custom application app of type SomeApp
that is hosted on a web server websrv,
which in turn is running on a compute node.
The application named app provides a capability to receive
messages, which is bound to the message_receiver
capability of the substitutable node type. It further requires access to a
database, so the application’s database_endpoint
requirement is mapped to the database_endpoint
requirement of the TransactionSubsystem
node type.
Properties of the TransactionSubsystem node type are used to
customize the instantiation of a subsystem. Those properties can be mapped to
any node template for which the author of the subsystem service template wants
to expose configurability. In the current example, the application app and the
web server middleware websrv get
configured through properties of the TransactionSubsystem
node type. All properties of that node type are defined as inputs of the service template. The input
parameters in turn get mapped to node templates by means of get_input function calls in the respective
sections of the service template.
Similarly, attributes of the whole subsystem can be obtained
from attributes of particular node templates. In the current example,
attributes of the web server and the hosting compute node will be exposed as
subsystem attributes. All exposed attributes that are defined as attributes of
the substitutable TransactionSubsystem
node type are defined as outputs of the subsystem service template.
An outline of the subsystem service
template is shown in the listing below. Note that this service template could
be used for stand-alone deployment of a transaction processing system as well,
i.e. it is not restricted just for use in substitution scenarios. Only the
presence of the substitution_mappings
metadata section in the topology_template
enables the service template for substitution use cases.
tosca_definitions_version:
tosca_simple_yaml_1_0
topology_template:
description: Template of a database including its hosting stack.
inputs:
mq_service_ip:
type: string
description: IP address of the message queuing server to receive messages
from
receiver_port:
type: string
description: Port to be used for receiving messages
# other inputs omitted for brevity
substitution_mappings:
node_type: example.TransactionSubsystem
capabilities:
message_receiver: [ app, message_receiver
]
requirements:
database_endpoint: [ app, database ]
node_templates:
app:
type: example.SomeApp
properties:
# properties omitted for brevity
capabilities:
message_receiver:
properties:
service_ip: { get_input: mq_service_ip }
# other properties omitted for brevity
requirements:
- database:
# details omitted for brevity
- host: websrv
websrv:
type: tosca.nodes.WebServer
properties:
# properties omitted for brevity
capabilities:
data_endpoint:
properties:
port_name: { get_input: receiver_port }
# other properties omitted for brevity
requirements:
- host: server
server:
type: tosca.nodes.Compute
# details omitted for brevity
outputs:
receiver_ip:
description: private IP address of the message receiver application
value: { get_attribute: [ server, private_address ] }
receiver_port:
description: Port of the message receiver endpoint
value: { get_attribute: [ app, app_endpoint, port ] }
|
14 Grouping
node templates
In designing applications composed of several interdependent
software components (or nodes) it is often desirable to manage these components
as a named group. This can provide an effective way of associating policies
(e.g., scaling, placement, security or other) that orchestration tools can
apply to all the components of group during deployment or during other
lifecycle stages.
In many realistic scenarios it is desirable to
include scaling capabilities into an application to be able to react on load
variations at runtime. The example below shows the definition of a scaling web
server stack, where a variable number of servers with apache installed on them
can exist, depending on the load on the servers.
Example 11 - Grouping Node Templates with same scaling policy
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: Template for a
scaling web server.
topology_template:
inputs:
# omitted here for brevity
node_templates:
apache:
type: tosca.nodes.WebServer.Apache
properties:
# Details omitted for
brevity
requirements:
- host: server
server:
type: tosca.nodes.Compute
# details omitted for
brevity
groups:
webserver_group:
members: [ apache, server ]
policies:
- my_scaling_policy:
# Specific policy
definitions are considered domain specific and
# are not included
here
|
The example first of all uses the concept of
grouping to express which components (node templates) need to be scaled as a
unit – i.e. the compute nodes and the software on-top of each compute node.
This is done by defining the webserver_group in the groups
section of the template and by adding both the apache node template and the server
node template as a member to the group.
Furthermore, a scaling policy
is defined for the group to express that the group as a whole (i.e. pairs of server node and the apache component installed on top)
should scale up or down under certain conditions.
In cases where no explicit
binding between software components and their hosting compute resources is
defined in a template, but only requirements are defined as has been shown in
section 11, a provider could decide to place software components on the same
host if their hosting requirements match, or to place them onto different
hosts.
It is often desired, though, to
influence placement at deployment time to make sure components get collocation
or anti-collocated. This can be expressed via grouping and policies as shown in
the example below.
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: Template hosting
requirements and placement policy.
topology_template:
inputs:
# omitted here for brevity
node_templates:
wordpress_server:
type: tosca.nodes.WebServer
properties:
# omitted here for brevity
requirements:
- host:
# Find a Compute node
that fulfills these additional filter reqs.
node_filter:
capabilities:
- host:
properties:
- mem_size:
{ greater_or_equal: 2 MB }
- disk_size:
{ greater_or_equal: 10 MB }
- os:
properties:
-
architecture: x86_64
- type:
linux
mysql:
type: tosca.nodes.DBMS.MySQL
properties:
# omitted here for brevity
requirements:
- host:
node: tosca.nodes.Compute
node_filter:
capabilities:
- host:
properties:
- disk_size:
{ greater_or_equal: 1 GB }
- os:
properties:
- architecture:
x86_64
- type:
linux
groups:
my_collocation_group:
members: [ wordpress_server,
mysql ]
policies:
-
my_anti_collocation_policy:
# Specific policy
definitions are considered domain specific and
# are not included
here
|
In the example above, both software components wordpress_server
and mysql
have similar hosting requirements. Therefore, a provider could decide to put
both on the same server as long as both their respective requirements can be
fulfilled. By defining a group of the two components and attaching an
anti-collocation policy to the group it can be made sure, though, that both
components are put onto different hosts at deployment time.
The YAML 1.2 specification allows for defining of aliases which allow for
authoring a block of YAML (or node) once and indicating it is an “anchor” and
then referencing it elsewhere in the same document as an “alias”. Effectively,
YAML parsers treat this as a “macro” and copy the anchor block’s code to
wherever it is referenced. Use of this feature is especially helpful when
authoring TOSCA Service Templates where similar definitions and property
settings may be repeated multiple times when describing a multi-tier
application.
For example, an application that has a web server and
database (i.e., a two-tier application) may be described using two Compute nodes (one to host the web server and
another to host the database). The author may want both Compute nodes to be
instantiated with similar properties such as operating system, distribution,
version, etc.
To accomplish this, the author would describe the
reusable properties using a named anchor in the “dsl_definitions”
section of the TOSCA Service Template and reference the anchor name as an alias
in any Compute node templates where these properties
may need to be reused. For example:
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile that just
defines a YAML macro for commonly reused Compute
properties.
dsl_definitions:
my_compute_node_props: &my_compute_node_props
disk_size: 10 GB
num_cpus: 1
mem_size: 4096 kB
topology_template:
node_templates:
my_server:
type: Compute
capabilities:
- host:
properties:
*my_compute_node_props
my_database:
type: Compute
capabilities:
- host:
properties:
*my_compute_node_props
|
It is possible for type and template authors to declare
input variables within an inputs block
on interfaces to nodes or relationships in order to pass along information
needed by their operations (scripts). These declarations can be scoped such as
to make these variable values available to all operations on a node or
relationships interfaces or to individual operations. TOSCA orchestrators will
make these values available as environment variables within the execution
environments in which the scripts associated with lifecycle operations are run.
16.1 Example: declaring
input variables for all operations on a single interface
|
node_templates:
wordpress:
type:
tosca.nodes.WebApplication.WordPress
requirements:
...
- database_endpoint:
mysql_database
interfaces:
Standard:
inputs:
wp_db_port: { get_property:
[ SELF, database_endpoint, port ] }
|
|
node_templates:
wordpress:
type:
tosca.nodes.WebApplication.WordPress
requirements:
...
- database_endpoint:
mysql_database
interfaces:
Standard:
create:
wordpress_install.sh
configure:
implementation: wordpress_configure.sh
inputs:
wp_db_port: { get_property:
[ SELF, database_endpoint, port ] }
|
In the case where an input variable name is defined
at more than one scope within the same interfaces section of a node or template
definition, the lowest (or innermost) scoped declaration would override those
declared at higher (or more outer) levels of the definition.
|
node_templates:
frontend:
type: MyTypes.SomeNodeType
attributes:
url: { get_operation_output: [ SELF,
Standard, create, generated_url ] }
interfaces:
Standard:
create:
implementation:
scripts/frontend/create.sh
|
In this example, the Standard create operation exposes /
exports an environment variable named “generated_url”
attribute which will be assigned to the WordPress node’s url attribute.
|
node_templates:
frontend:
type: MyTypes.SomeNodeType
interfaces:
Standard:
create:
implementation:
scripts/frontend/create.sh
configure:
implementation:
scripts/frontend/configure.sh
inputs:
data_dir: { get_operation_output: [ SELF, Standard, create, data_dir ] }
|
In this example, the Standard
lifecycle’s create operation exposes / exports an
environment variable named “data_dir” which will be
passed as an input to the Standard lifecycle’s configure
operation.
A TOSCA service template contains a topology template,
which models the components of an application, their relationships and
dependencies (a.k.a., a topology model) that get interpreted and instantiated
by TOSCA Orchestrators. The actual node and relationship instances that are
created represent a set of resources distinct from the template itself, called
a topology instance (model). The direction of this specification is to
provide access to the instances of these resources for management and operational
control by external administrators. This model can also be accessed by an
orchestration engine during deployment – i.e. during the actual process of
instantiating the template in an incremental fashion, That is, the orchestrator
can choose the order of resources to instantiate (i.e., establishing a partial
set of node and relationship instances) and have the ability, as they are being
created, to access them in order to facilitate instantiating the remaining
resources of the complete topology template.
Most entity types in TOSCA (e.g., Node, Relationship,
Requirement and Capability Types) have property
definitions which allow template authors to set the values for as inputs
when these entities are instantiated by an orchestrator. These property values
are considered to reflect the desired state of the entity by the author. Once
instantiated, the actual values for these properties on the realized (instantiated)
entity are obtainable via attributes on the entity with the same name as the
corresponding property.
In other words, TOSCA orchestrators will
automatically reflect (i.e., make available) any property defined on an entity
making it available as an attribute of the entity with the same name as the
property.
Use of this feature is shown in the example below where a
source node named my_client, of type ClientNode, requires a connection to another
node named my_server of type ServerNode. As you can see, the ServerNode type defines a property named notification_port which defines a dedicated
port number which instances of my_client
may use to post asynchronous notifications to it during runtime. In this case,
the TOSCA Simple Profile assures that the notification_port
property is implicitly reflected as an attribute in the my_server node (also with the name notification_port) when its node template is
instantiated.
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile that shows
how the (notification_port) property is reflected as an attribute and can be
referenced elsewhere.
node_types:
ServerNode:
derived_from: SoftwareComponent
properties:
notification_port:
type: integer
capabilities:
# omitted here for brevity
ClientNode:
derived_from: SoftwareComponent
properties:
# omitted here for brevity
requirements:
- server:
capability: Endpoint
node: ServerNode
relationship:
ConnectsTo
topology_template:
node_templates:
my_server:
type:
ServerNode
properties:
notification_port:
8000
my_client:
type:
ClientNode
requirements:
-
server:
node: my_server
relationship: my_connection
relationship_templates:
my_connection:
type: ConnectsTo
interfaces:
Configure:
inputs:
targ_notify_port: { get_attribute: [ TARGET, notification_port ] }
# other operation definitions omitted here for brevity
|
Specifically, the above example shows that the ClientNode type needs the notification_port value anytime a node of ServerType is connected to it using the ConnectsTo relationship in order to make it
available to its Configure operations
(scripts). It does this by using the get_attribute
function to retrieve the notification_port
attribute from the TARGET node of the ConnectsTo relationship (which is a node of
type ServerNode) and assigning it to an
environment variable named targ_notify_port.
It should be noted that the actual port value of the notification_port attribute may or may not be
the value 8000 as requested on the
property; therefore, any node that is dependent on knowing its actual “runtime”
value would use the get_attribute
function instead of the get_property
function.
Appendix A. TOSCA Simple Profile definitions
in YAML
This section describes all of the YAML block structure for
all keys and mappings that are defined for the TOSCA Version 1.0 Simple Profile
specification that are needed to describe a TOSCA Service Template (in YAML).
A.1 TOSCA namespace and alias
The following table defines the namespace alias and
(target) namespace values that SHALL be used when referencing the TOSCA Simple
Profile version 1.0 specification.
A.1.1 Rules to avoid namespace
collisions
TOSCA Simple Profiles allows template authors to declare
their own types and templates and assign them simple names with no apparent
namespaces. Since TOSCA Service Templates can import other service templates
to introduce new types and topologies of templates that can be used to provide
concrete implementations (or substitute) for abstract nodes. Rules are needed
so that TOSCA Orchestrators know how to avoid collisions and apply their own
namespaces when import and nesting occur.
The following cases are considered:
·
Duplicate property names within same entity (e.g., Node Type,
Node Template, Relationship Type, etc.)
·
Duplicate requirement names within same entity (e.g., Node Type,
Node Template, Relationship Type, etc.)
·
Duplicate capability names within same entity (e.g., Node Type,
Node Template, Relationship Type, etc.)
·
Collisions that occurs from “import” for any Type or Template.
·
Collision that occurs from “substitution” of other Node
Templates.
A.2 Parameter and property
types
This clause describes the primitive types that are used for
declaring normative properties, parameters and grammar elements throughout this
specification.
A.2.1
Referenced YAML Types
Many of the types we use in this profile are
built-in types from the YAML
1.2 specification (i.e., those identified by the “tag:yaml.org,2002”
version tag).
The following table declares the valid YAML type
URIs and aliases that SHALL be used when possible when defining parameters or
properties within TOSCA Service Templates using this specification:
A.2.1.1 Notes
·
The “string” type is the default type when not specified on a
parameter or property declaration.
·
While YAML supports further type aliases, such as “str” for
“string”, the TOSCA Simple Profile specification promotes the fully expressed
alias name for clarity.
A.2.2 TOSCA version
TOSCA supports the concept of “reuse” of type definitions,
as well as template definitions which could be version and change over time.
It is important to provide a reliable, normative means to represent a version
string which enables the comparison and management of types and templates over
time. Therefore, the TOSCA TC intends to provide a normative version type
(string) for this purpose in future Working Drafts of this specification.
|
Shorthand Name
|
version
|
|
Type Qualified Name
|
tosca:version
|
A.2.2.1 Grammar
TOSCA version strings have the following grammar:
|
<major_version>.<minor_version>[.<fix_version>[.<qualifier>[-<build_version]
] ]
|
In the above grammar, the pseudo values that appear
in angle brackets have the following meaning:
·
major_version: is a required integer value
greater than or equal to 0 (zero)
·
minor_version: is a required integer value
greater than or equal to 0 (zero).
·
fix_version: is a optional integer value
greater than or equal to 0 (zero).
·
qualifier: is an optional string that indicates
a named, pre-release version of the associated code that has been derived from
the version of the code identified by the combination major_version,
minor_version and fix_version numbers.
·
build_version: is an optional integer value
greater than or equal to 0 (zero) that can be used to further qualify different
build versions of the code that has the same qualifer_string.
A.2.2.2 Version Comparison
·
When comparing TOSCA versions, all component versions (i.e.,
major, minor and fix) are compared in sequence from left to right.
·
TOSCA versions that include the optional qualifier are considered
older than those without a qualifier.
·
TOSCA versions with the same major, minor, and fix versions and
have the same qualifier string, but with different build versions can be
compared based upon the build version.
·
Qualifier strings are considered domain-specific. Therefore,
this specification makes no recommendation on how to compare TOSCA versions
with the same major, minor and fix versions, but with different qualifiers
strings and simply considers them different named branches derived from the
same code.
A.2.2.3 Examples
Example of a version with
|
# basic version strings
6.1
2.0.1
# version string with optional
qualifier
3.1.0.beta
# version string with optional
qualifier and build version
1.0.0.alpha-10
|
A.2.2.4 Notes
·
[Maven-Version] The TOSCA
version type is compatible with the Apache Maven versioning policy.
A.2.2.5 Additional Requirements
·
A version value of zero (i.e., ‘0’, ‘0.0’, or ‘0.0.0’) SHALL
indicate there no version provided.
·
A version value of zero used with any qualifiers SHALL NOT be
valid.
A.2.3 TOCSA range type
The range type can be used to define numeric ranges
with a lower and upper boundary. For example, this allows for specifying a
range of ports to be opened in a firewall.
|
Shorthand Name
|
range
|
|
Type Qualified Name
|
tosca:range
|
A.2.3.1 Grammar
TOSCA range values have the following grammar:
|
[<lower_bound>,
<upper_bound>]
|
In the above grammar, the pseudo values that appear
in angle brackets have the following meaning:
·
lower_bound: is a required integer value that
denotes the lower boundary of the range.
·
upper_bound: is a required integer value that
denotes the upper boundary of the range. This value must be greater than lower_bound.
A.2.3.2 Keywords:
The following Keywords may be used in the TOSCA
range type:
|
Keyword
|
Applicable Types
|
Description
|
|
UNBOUNDED
|
scalar
|
Used to represent an unbounded upper bounds (positive)
value in a set for a scalar type.
|
A.2.3.3 Examples
Example of a node template property with a range
value:
|
# numeric range between 1 and 100
a_range_property: [ 1, 100 ]
# a property that has allows any
number 0 or greater
num_connections: [ 0, UNBOUNDED ]
|
A.2.4 TOSCA list type
The list type allows for specifying multiple values for a
parameter of property. For example, if an application allows for being
configured to listen on multiple ports, a list of ports could be configured
using the list data type.
Note that entries in a list for one property or
parameter must be of the same type. The type (for simple entries) or schema
(for complex entries) is defined by the entry_schema attribute
of the respective property definition,
attribute definitions, or input or
output parameter definitions.
|
Shorthand Name
|
list
|
|
Type Qualified Name
|
tosca:list
|
A.2.4.1 Grammar
TOSCA lists are essentially normal YAML lists with
the following grammars:
A.2.4.1.1 Square bracket notation
|
[ <list_entry_1>,
<list_entry_2>, ... ]
|
A.2.4.1.2 Bulleted (sequenced) list notation
|
- <list_entry_1>
- ...
- <list_entry_n>
|
In the above grammars, the pseudo values that appear
in angle brackets have the following meaning:
·
<list_entry_*>: represents one entry of
the list.
A.2.4.2 Declaration Examples
A.2.4.2.1 List declaration using a simple type
The following example shows a list declaration with
an entry schema based upon a simple integer type (which has additional
constraints):
|
<some_entity>:
...
properties:
listen_ports:
type: list
entry_schema:
description: listen port
entry (simple integer type)
type: integer
constraints:
- rangemax_length: 128
|
A.2.4.2.2 List declaration using a complex type
The following example shows a list declaration with
an entry schema based upon a complex type:
|
<some_entity>:
...
properties:
products:
type: list
entry_schema:
description: Product
information entry (complex type) defined elsewhere
type: ProductInfo
|
A.2.4.3 Definition Examples
These examples show two notation options for defining lists:
·
A single-line option which is useful for only short lists with
simple entries.
·
A multi-line option where each list entry is on a separate line;
this option is typically useful or more readable if there is a large number of
entries, or if the entries are complex.
A.2.4.3.1 Square bracket notation
|
listen_ports: [ 80, 8080 ]
|
A.2.4.3.2 Bulleted list notation
|
listen_ports:
- 80
- 8080
|
A.2.5 TOSCA map type
The map type allows for specifying multiple values for a
parameter of property as a map. In contrast to the list type, where each entry
can only be addressed by its index in the list, entries in a map are named
elements that can be addressed by their keys.
Note that entries in a map for one property or
parameter must be of the same type. The type (for simple entries) or schema
(for complex entries) is defined by the entry_schema attribute
of the respective property definition,
attribute definition, or input or
output parameter definition.
|
Shorthand Name
|
map
|
|
Type Qualified Name
|
tosca:map
|
A.2.5.1 Grammar
TOSCA maps are normal YAML dictionaries with
following grammar:
A.2.5.1.1 Single-line grammar
|
{ <entry_key_1>:
<entry_value_1>, ..., <entry_key_n>: <entry_value_n> }
...
<entry_key_n>:
<entry_value_n>
|
A.2.5.1.2 Multi-line grammar
|
<entry_key_1>:
<entry_value_1>
...
<entry_key_n>:
<entry_value_n>
|
In the above grammars, the pseudo values that appear
in angle brackets have the following meaning:
·
entry_key_*: is the required key for an entry
in the map
·
entry_value_*: is the value of the respective
entry in the map
A.2.5.2 Declaration Examples
A.2.5.2.1 Map declaration using a simple type
The following example shows a map with an entry
schema definition based upon an existing string type (which has additional
constraints):
|
<some_entity>:
...
properties:
emails:
type: map
entry_schema:
description: basic email
address
type: string
constraints:
- max_length: 128
|
A.2.5.2.2 Map declaration using a complex type
The following example shows a map with an entry
schema definition for contact information:
|
<some_entity>:
...
properties:
contacts:
type: map
entry_schema:
description: simple
contact information
type: ContactInfo
|
A.2.5.3 Definition Examples
These examples show two notation options for
defining maps:
·
A single-line option which is useful for only short maps with simple
entries.
·
A multi-line option where each map entry is on a separate line;
this option is typically useful or more readable if there is a large number of
entries, or if the entries are complex.
A.2.5.3.1 Single-line notation
|
# notation option for shorter maps
user_name_to_id_map: { user1:
1001, user2: 1002 }
|
A.2.5.3.2 Multi-line notation
|
# notation for longer maps
user_name_to_id_map:
user1: 1001
user2: 1002
|
A.2.6 TOCSA
scalar-unit type
The scalar-unit type can be used to define scalar values
along with a unit from the list of recognized units provided below.
A.2.6.1 Grammar
TOSCA scalar-unit typed values have the following
grammar:
In the above grammar, the pseudo values that appear
in angle brackets have the following meaning:
·
scalar: is a required scalar value.
·
unit: is a required unit value. The unit value
MUST be type-compatible with the scalar.
A.2.6.2 Additional requirements
·
Whitespace: any number of spaces (including zero or
none) SHALL be allowed between the scalar
value and the unit value.
·
It SHALL be considered an error if either the scalar or
unit portion is missing on a property or attribute declaration derived from any
scalar-unit type.
·
When performing constraint clause evaluation on values of the
scalar-unit type, both the scalar value portion and unit value portion SHALL
be compared together (i.e., both are treated as a single value). For example,
if we have a property called storage_size.
which is of type scalar-unit, a valid range constraint would appear as follows:
o storage_size: in_range [ 4 GB, 20 GB ]
where storage_size’s range would be evaluated using
both the numeric and unit values (combined together), in this case ‘4 GB’ and
’20 GB’.
A.2.6.3 Concrete Types
|
Shorthand Names
|
scalar-unit.size, scalar-unit.size
|
|
Type Qualified Names
|
tosca:scalar-unit.size, tosca:scalar-unit.time
|
The scalar-unit type grammar is abstract and has two
recognized concrete types in TOSCA:
·
scalar-unit.size – used to define properties that have
scalar values measured in size units.
·
scalar-unit.time – used to define properties that have
scalar values measured in size units.
·
scalar-unit.frequency – used to define properties that
have scalar values measured in units per second.
These types and their allowed unit values are
defined below.
A.2.6.4 scalar-unit.size
A.2.6.4.1 Recognized Units
|
Unit
|
Usage
|
Description
|
|
B
|
size
|
byte
|
|
kB
|
size
|
kilobyte (1000 bytes)
|
|
KiB
|
size
|
kibibytes (1024 bytes)
|
|
MB
|
size
|
megabyte (1000000 bytes)
|
|
MiB
|
size
|
mebibyte (1048576 bytes)
|
|
GB
|
size
|
gigabyte (1000000000 bytes)
|
|
GiB
|
size
|
gibibytes (1073741824 bytes)
|
|
TB
|
size
|
terabyte (1000000000000
bytes)
|
|
TiB
|
size
|
tebibyte (1099511627776
bytes)
|
A.2.6.4.2 Examples
|
# Storage size in Gigabytes
properties:
storage_size: 10 GB
|
A.2.6.4.3 Notes
A.2.6.5 scalar-unit.time
A.2.6.5.1 Recognized Units
|
Unit
|
Usage
|
Description
|
|
d
|
time
|
days
|
|
h
|
time
|
hours
|
|
m
|
time
|
minutes
|
|
s
|
time
|
seconds
|
|
ms
|
time
|
milliseconds
|
|
us
|
time
|
microseconds
|
|
ns
|
time
|
nanoseconds
|
A.2.6.5.2 Examples
|
# Response time in milliseconds
properties:
respone_time: 10 ms
|
A.2.6.5.3 Notes
A.2.6.6 scalar-unit.frequency
A.2.6.6.1 Recognized Units
|
Unit
|
Usage
|
Description
|
|
Hz
|
frequency
|
Hertz, or Hz. equals one cycle per second.
|
|
kHz
|
frequency
|
Kilohertz, or kHz, equals to 1,000 Hertz
|
|
MHz
|
frequency
|
Megahertz, or MHz, equals to 1,000,000 Hertz or 1,000 kHz
|
|
GHz
|
frequency
|
Gigahertz, or GHz, equals to 1,000,000,000 Hertz, or
1,000,000 kHz, or 1,000 MHz.
|
A.2.6.6.2 Examples
|
# Processor raw clock rate
properties:
clock_rate: 2.4 GHz
|
A.2.6.6.3 Notes
·
The value for Hertz (Hz) is the International Standard Unit (ISU)
as described by the Bureau International des Poids et Mesures (BIPM) in the “SI Brochure: The International System of Units (SI) [8th edition,
2006; updated in 2014]”, http://www.bipm.org/en/publications/si-brochure/
A.3 Normative values
A.3.1 Node States
As components (i.e., nodes) of TOSCA applications are deployed,
instantiated and orchestrated over their lifecycle using normative lifecycle
operations (see section C.6 for normative lifecycle definitions) it is
important define normative values for communicating the states of these components
normatively between orchestration and workflow engines and any managers of
these applications.
The following table provides the list of recognized
node states for TOSCA Simple Profile that would be set by the orchestrator to
describe a node instance’s state:
|
Node State
|
|
Value
|
Transitional
|
Description
|
|
initial
|
no
|
Node is not yet created.
Node only exists as a template definition.
|
|
creating
|
yes
|
Node is transitioning from initial state
to created state.
|
|
created
|
no
|
Node software has been
installed.
|
|
configuring
|
yes
|
Node is transitioning from created state
to configured state.
|
|
configured
|
no
|
Node has been configured
prior to being started.
|
|
starting
|
yes
|
Node is transitioning from configured
state to started state.
|
|
started
|
no
|
Node is started.
|
|
stopping
|
yes
|
Node is transitioning from
its current state to a configured state.
|
|
deleting
|
yes
|
Node is transitioning from
its current state to one where it is deleted and its state is no longer
tracked by the instance model.
|
|
error
|
no
|
Node is in an error state.
|
A.3.2 Directives
There are currently no directive values defined for
this version of the TOSCA Simple Profile.
A.3.3 Network Name aliases
The following are recognized values that may be used
as aliases to reference types of networks within an application model without knowing
their actual name (or identifier) which may be assigned by the underlying Cloud
platform at runtime.
|
Alias value
|
Description
|
|
PRIVATE
|
An alias used to reference
the first private network within a property or attribute of a Node or
Capability which would be assigned to them by the underlying platform at
runtime.
A private network contains
IP addresses and ports typically used to listen for incoming traffic to an
application or service from the Intranet and not accessible to the public
internet.
|
|
PUBLIC
|
An alias used to reference
the first public network within a property or attribute of a Node or
Capability which would be assigned to them by the underlying platform at
runtime.
A public network contains IP
addresses and ports typically used to listen for incoming traffic to an
application or service from the Internet.
|
A.3.3.1 Usage
These aliases would be used in the tosca.capabilities.Endpoint Capability type
(and types derived from it) within the network_name
field for template authors to use to indicate the type of network the Endpoint
is supposed to be assigned an IP address from.
A.4 TOSCA Metamodel
This section defines all modelable entities that comprise
the TOSCA Version 1.0 Simple Profile specification along with their keynames,
grammar and requirements.
A.4.1 Required Keynames
The TOSCA metamodel includes complex types (e.g., Node
Types, Relationship Types, Capability Types, Data Types, etc.) each of which
include their own list of reserved keynames that are sometimes marked as required.
These types may be used to derive other types. These derived types (e.g.,
child types) do not have to provide required keynames as long as they have been
specified in the type they have been derived from (i.e., their parent type).
A.5 Reusable modeling
definitions
A.5.1 Description
definition
This optional element provides a means include single or
multiline descriptions within a TOSCA Simple Profile template as a scalar
string value.
A.5.1.1 Keyname
The following keyname is used to provide a
description within the TOSCA Simple Profile specification:
A.5.1.2 Grammar
Description definitions have the following grammar:
A.5.1.3 Examples
Simple descriptions are treated as a single literal
that includes the entire contents of the line that immediately follows the description
key:
|
description: This is an example of a single line description (no
folding).
|
The YAML “folded” style may also be used for
multi-line descriptions which “folds” line breaks as space characters.
|
description: >
This is an example of a
multi-line description using YAML. It permits for line
breaks for easier readability...
if needed. However, (multiple)
line breaks are folded into a single space
character when processed into a
single string value.
|
A.5.1.4 Notes
- Use of “folded” style is discouraged for the
YAML string type apart from when used with the description keyname.
A.5.2 Constraint
clause
A constraint clause defines an operation along with one or
more compatible values that can be used to define a constraint on a property or
parameter’s allowed values when it is defined in a TOSCA Service Template or
one of its entities.
A.5.2.1 Operator keynames
The following is the list of recognized operators
(keynames) when defining constraint clauses:
|
Operator
|
Type
|
Value Type
|
Description
|
|
equal
|
scalar
|
any
|
Constrains a property or parameter to a value equal to
(‘=’) the value declared.
|
|
greater_than
|
scalar
|
comparable
|
Constrains a property or parameter to a value greater than
(‘>’) the value declared.
|
|
greater_or_equal
|
scalar
|
comparable
|
Constrains a property or parameter to a value greater than
or equal to (‘>=’) the value declared.
|
|
less_than
|
scalar
|
comparable
|
Constrains a property or parameter to a value less than
(‘<’) the value declared.
|
|
less_or_equal
|
scalar
|
comparable
|
Constrains a property or parameter to a value less than or
equal to (‘<=’) the value declared.
|
|
in_range
|
dual scalar
|
comparable, range
|
Constrains a property or parameter to a value in range of
(inclusive) the two values declared.
Note: subclasses or templates of types that declare a
property with the in_range constraint MAY only further restrict the range
specified by the parent type.
|
|
valid_values
|
list
|
any
|
Constrains a property or parameter to a value that is in
the list of declared values.
|
|
length
|
scalar
|
string, list, map
|
Constrains the property or parameter to a value of a given
length.
|
|
min_length
|
scalar
|
string, list, map
|
Constrains the property or parameter to a value to a
minimum length.
|
|
max_length
|
scalar
|
string, list, map
|
Constrains the property or parameter to a value to a
maximum length.
|
|
pattern
|
regex
|
string
|
Constrains the property or parameter to a value that is
allowed by the provided regular expression.
Note: Future drafts of this specification will detail the use of
regular expressions and reference an appropriate standardized grammar.
|
A.5.2.1.1 Comparable value
types
In the Value Type column above, an entry of “comparable”
includes integer, float,
timestamp, string,
version, and scalar-unit
types while an entry of “any” refers to any type allowed in the TOSCA
simple profile in YAML.
A.5.2.2 Additional Requirements
·
If no operator is present for a simple scalar-value on a
constraint clause, it SHALL be interpreted as being equivalent to having
the “equal” operator provided; however, the “equal”
operator may be used for clarity when expressing a constraint clause.
·
The “length” operator SHALL be
interpreted mean “size” for set types (i.e., list, map, etc.).
A.5.2.3 Grammar
Constraint clauses have one of the following
grammars:
|
# Scalar grammar
<operator>:
<scalar_value>
# Dual scalar grammar
<operator>: [
<scalar_value_1>, <scalar_value_2> ]
# List grammar
<operator> [
<value_1>, <value_2>, ..., <value_n> ]
# Regular expression (regex)
grammar
pattern:
<regular_expression_value>
|
In the above grammar, the
pseudo values that appear in angle brackets have the following meaning:
·
operator: represents a
required operator from the specified list shown above (see section A.5.2.1 “Operator keynames”).
·
scalar_value, scalar_value_*:
represents a required scalar (or atomic quantity) that can hold only one value
at a time. This will be a value of a primitive type, such as an integer or
string that is allowed by this specification.
·
value_*: represents a
required value of the operator that is not limited to scalars.
·
reqular_expression_value:
represents a regular expression (string) value.
A.5.2.4 Examples
Constraint clauses used on parameter or property
definitions:
|
# equal
equal: 2
# greater_than
greater_than: 1
# greater_or_equal
greater_or_equal: 2
# less_than
less_than: 5
# less_or_equal
less_or_equal: 4
# in_range
in_range: [ 1, 4 ]
# valid_values
valid_values: [ 1, 2, 4 ]
# specific length (in characters)
length: 32
# min_length (in characters)
min_length: 8
# max_length (in characters)
max_length: 64
|
A.5.2.5 Additional
Requirements
- Values provided by the operands (i.e., values
and scalar values) SHALL be type-compatible with their associated
operations.
- Future drafts of this specification will detail
the use of regular expressions and reference an appropriate standardized
grammar.
A.5.3 Property
Filter definition
A property filter definition defines criteria, using
constraint clauses, for selection of a TOSCA entity based upon it property
values.
A.5.3.1 Grammar
Property filter definitions have one of the
following grammars:
A.5.3.1.1 Short notation:
The following single-line grammar may be used when
only a single constraint is needed on a property:
A.5.3.1.2 Extended notation:
The following multi-line grammar may be used when
multiple constraints are needed on a property:
In the above grammars, the pseudo values that appear
in angle brackets have the following meaning:
·
property_name:
represents the name of property that would be used to select a
property definition with the same name (property_name) on a TOSCA entity (e.g.,
a Node Type, Node Template, Capability Type, etc.).
·
property_constraint_clause_*:
represents constraint clause(s) that would be used to filter entities based
upon the named property’s value(s).
A.5.3.2 Additional Requirements
·
Property constraint clauses must be type compatible with the
property definitions (of the same name) as defined on the target TOSCA entity
that the clause would be applied against.
A.5.4 Node
Filter definition
A node filter definition defines criteria for selection of a
TOSCA Node Template based upon the template’s property values, capabilities and
capability properties.
A.5.4.1 Keynames
The following is the list of recognized keynames
recognized for a TOSCA node filter definition:
|
Keyname
|
Required
|
Type
|
Description
|
|
properties
|
no
|
list of
property filter definition
|
An optional sequenced list of
property filters that would be used to select (filter) matching TOSCA
entities (e.g., Node Template, Node Type, Capability Types, etc.) based upon
their property definitions’ values.
|
|
capabilities
|
no
|
list of capability names or capability type names
|
An optional sequenced list of
capability names or types that would be used to select (filter) matching
TOSCA entities based upon their existence.
|
A.5.4.2 Additional filtering on named Capability
properties
Capabilities used as filters often have their own
sets of properties which also can be used to construct a filter.
|
Keyname
|
Required
|
Type
|
Description
|
|
<capability
name_or_type>
name>:
properties
|
no
|
list of
property filter definitions
|
An optional sequenced list of
property filters that would be used to select (filter) matching TOSCA
entities (e.g., Node Template, Node Type, Capability Types, etc.) based upon
their capabilities’ property definitions’ values.
|
A.5.4.3 Grammar
Node filter definitions have one of the following
grammars:
In the above grammar, the pseudo values that appear
in angle brackets have the following meaning:
·
property_filter_def_*:
represents a property filter definition that would be used to
select (filter) matching TOSCA entities (e.g., Node Template, Node Type,
Capability Types, etc.) based upon their property definitions’ values.
·
property_constraint_clause_*:
represents constraint clause(s) that would be used to filter entities based
upon property values.
·
capability_name_or_type_*: represents the type or name of
a capability that would be used to select (filter) matching TOSCA entities
based upon their existence.
·
cap_*_property_def_*:
represents a property filter definition that would be used to select (filter)
matching TOSCA entities (e.g., Node Template, Node Type, Capability Types,
etc.) based upon their capabilities’ property definitions’ values.
A.5.4.4 Additional requirements
·
TOSCA orchestrators SHALL search for matching capabilities
listed on a target filter by assuming the capability name is first a symbolic
name and secondly it is a type name (in order to avoid namespace collisions).
A.5.4.5 Example
The following example is a filter that would be used to
select a TOSCA Compute node based upon
the values of its defined capabilities. Specifically, this filter would select Compute
nodes that supported a specific range of CPUs (i.e., num_cpus value between 1 and 4) and memory
size (i.e., mem_size of 2 or greater)
from its declared “host” capability. In this example, the author also wants
the Compute node to support an encryption capability of type mytypes.capabilities.compute.encryption which
has properties that support a specific (AES) encryption algorithm and keylength (128).
|
my_node_template:
# other details omitted for
brevity
requirements:
- host:
node_filter:
capabilities:
# My “host” Compute
node needs these properties:
- host:
properties:
- num_cpus: { in_range:
[ 1, 4 ] }
- mem_size: {
greater_or_equal: 2 MB }
# and should also
support this type of encryption and properties:
- mytypes.capabilities.compute.encryption:
properties:
- algorithm: {
equal: aes }
- keylength: {
valid_values: [ 128, 256 ] }
|
A.5.5 Artifact definition
An artifact definition defines a named, typed file that can
be associated with Node Type or Node Template and used by orchestration engine
to facilitate deployment and implementation of interface operations.
A.5.5.1 Keynames
The following is the list of recognized keynames
recognized for a TOSCA artifact definition:
|
Keyname
|
Required
|
Type
|
Description
|
|
type
|
yes
|
string
|
The required artifact type for the artifact definition.
|
|
implementation
|
no
|
string
|
The optional URI string (relative or absolute) which can
be used to locate the artifact’s file.
|
|
repository
|
no
|
string
|
The optional name of the repository definition which
contains the location of the external repository that contains the artifact.
The artifact is expected to be referenceable by its implementation URI within the repository.
|
|
description
|
no
|
description
|
The optional description for the artifact definition.
|
|
deploy_path
|
no
|
string
|
The file path the associated file would be deployed into
within the target node’s container.
|
A.5.5.2 Grammar
Artifact definitions have one of the following
grammars:
A.5.5.2.1 Short notation
The following single-line grammar may be used when the
artifact’s type and mime type can be inferred from the file URI:
A.5.5.2.2 Extended notation:
The following multi-line grammar may be used when
the artifact’s definition’s type and mime type need to be explicitly declared:
In the above grammars, the pseudo values that appear
in angle brackets have the following meaning:
·
artifact_name: represents the required symbolic
name of the artifact as a string.
·
artifact_description: represents the optional description for the artifact.
·
artifact_type_name: represents the required artifact type the artifact definition is
based upon.
·
artifact_file_URI: represents the required URI string
(relative or absolute) which can be used to locate the artifact’s file.
·
file_deployement_path: represents the optional
path the artifact_file_URI would be copied into within the
target node’s container.
A.5.5.3 Example
The following represents an artifact definition:
|
my_file_artifact:
../my_apps_files/operation_artifact.txt
|
A.5.6 Repository definition
A repository definition defines a named external repository
which contains deployment and implementation artifacts that are referenced
within the TOSCA Service Template.
A.5.6.1 Keynames
The following is the list of recognized keynames
recognized for a TOSCA repository definition:
|
Keyname
|
Required
|
Type
|
Constraints
|
Description
|
|
description
|
no
|
description
|
None
|
The optional description for the repository.
|
|
url
|
yes
|
string
|
None
|
The required URL or network address used to access the
repository.
|
|
credential
|
no
|
Credential
|
None
|
The optional Credential used to authorize access to the
repository.
|
A.5.6.2 Grammar
Repository definitions have one the following
grammars:
A.5.6.2.1 Single-line grammar (no credential):
A.5.6.2.2 Multi-line grammar
In the above grammar, the pseudo values that appear
in angle brackets have the following meaning:
·
repository_name:
represents the required symbolic name of the repository as a string.
·
repository_description:
contains an optional description of the repository.
·
repository_address:
represents the required URL of the repository as a string.
·
authorization_credential:
represents the optional credentials (e.g., user ID and password) used to
authorize access to the repository.
A.5.6.3 Additional Requirements
·
None
A.5.6.4 Example
The following represents a repository definition:
|
repositories:
my_code_repo:
description: My project’s code
repository in GitHub
url: https://github.com/my-project/
|
A.5.7 Property
definition
A property definition defines a named, typed value and
related data that can be associated with an entity defined in this
specification (e.g., Node Types, Relationship Types, Capability Types, etc.).
Properties are used by template authors to provide input values to TOSCA
entities which indicate their “desired state” when they are instantiated. The
value of a property can be retrieved using the get_property function within TOSCA Service
Templates.
A.5.7.1.1 Attribute and Property reflection
The actual state of the entity, at any point in its
lifecycle once instantiated, is reflected by Attribute definitions. TOSCA
orchestrators automatically create an attribute for every declared property
(with the same symbolic name) to allow introspection of both the desired state
(property) and actual state (attribute).
A.5.7.2 Keynames
The following is the list of recognized keynames
recognized for a TOSCA property definition:
|
Keyname
|
Required
|
Type
|
Constraints
|
Description
|
|
type
|
yes
|
string
|
None
|
The required data type for the property.
|
|
description
|
no
|
description
|
None
|
The optional description for the property.
|
|
required
|
no
|
boolean
|
default: true
|
An optional key that declares a property as required (true)
or not (false).
|
|
default
|
no
|
<any>
|
None
|
An optional key that may provide a value to be used as a
default if not provided by another means.
|
|
status
|
no
|
string
|
default: supported
|
The optional status of the property relative to the
specification or implementation. See table below for valid values.
|
|
constraints
|
no
|
list of
constraint
clauses
|
None
|
The optional list of sequenced constraint clauses for the
property.
|
|
entry_schema
|
no
|
string
|
None
|
The optional key that is used to declare the name of the Datatype definition for entries of set
types such as the TOSCA list or map.
|
A.5.7.3
Status values
The following
property status values are supported:
|
Value
|
Description
|
|
supported
|
Indicates the property is supported. This is the default
value for all property definitions.
|
|
unsupported
|
Indicates the property is not supported.
|
|
experimental
|
Indicates the property is experimental and has no official
standing.
|
|
deprecated
|
Indicates the property has been deprecated by a new
specification version.
|
A.5.7.4 Grammar
Named property definitions have the following
grammar:
In the above grammar, the pseudo values that appear
in angle brackets have the following meaning:
·
property_name: represents
the required symbolic name of the property as a string.
·
property_description:
represents the optional description of
the property.
·
property_type: represents
the required data type of the property.
·
property_required:
represents an optional boolean value (true or
false) indicating whether or not the property is required. If this keyname is
not present on a property definition, then the property SHALL be considered required
(i.e., true) by default.
·
default_value: contains a
type-compatible value that may be used as a default if not provided by another
means.
·
status_value: a string that contains a keyword that indicates the
status of the property relative to the specification or implementation.
·
property_constraints:
represents the optional sequenced list of one or more constraint clauses on the property
definition.
·
entry_description:
represents the optional description of
the entry schema.
·
entry_type: represents
the required type name for entries in a
list or map property
type.
·
entry_constraints:
represents the optional sequenced list of one or more constraint clauses on entries in a list or map property
type.
A.5.7.5 Additional Requirements
·
Implementations of the TOSCA Simple Profile SHALL automatically
reflect (i.e., make available) any property defined on an entity as an
attribute of the entity with the same name as the property.
·
A property SHALL be considered required by default
(i.e., as if the required keyname on the definition is set to true)
unless the definition’s required keyname is
explicitly set to false.
·
The value provided on a property definition’s default
keyname SHALL be type compatible with the type declared on the
definition’s type keyname.
- Constraints of a property definition SHALL
be type-compatible with the type defined for that definition.
A.5.7.6 Notes
·
This element directly maps to the PropertiesDefinition
element defined as part of the schema for most type and entities defined in the
TOSCA v1.0 specification.
- In the TOSCA v1.0
specification constraints are expressed in the XML Schema definitions
of Node Type properties referenced in the PropertiesDefinition element of NodeType definitions.
A.5.7.7 Example
The following represents an example of a property definition
with constraints:
|
num_cpus:
type: integer
description: Number of CPUs requested
for a software node instance.
default: 1
required: true
constraints:
- valid_values: [ 1, 2, 4, 8 ]
|
A.5.8
Property assignment
This section defines the grammar for assigning values to
named properties within TOSCA Node and Relationship templates which are defined
in their corresponding named types.
A.5.8.1 Keynames
The TOSCA property assignment has no keynames.
A.5.8.2 Grammar
Property assignments have the following grammar:
A.5.8.2.1 Short notation:
The following single-line grammar may be used when a
simple value assignment is needed:
|
<property_name>:
<property_value> | { <property_value_expression> }
|
In the above grammars, the pseudo values that appear
in angle brackets have the following meaning:
·
property_name:
represents the name of a property that would be used to select a
property definition with the same name within on a TOSCA entity (e.g., Node
Template, Relationship Template, etc,) which is declared in its declared type (e.g.,
a Node Type, Node Template, Capability Type, etc.).
·
property_value, property_value_expression:
represent the type-compatible value to assign to the named property. Property
values may be provided as the result from the evaluation of an expression or a
function.
A.5.9 Attribute
definition
An attribute definition defines a named, typed value that
can be associated with an entity defined in this specification (e.g., a Node,
Relationship or Capability Type). Specifically, it is used to expose the
“actual state” of some property of a TOSCA entity after it has been deployed
and instantiated (as set by the TOSCA orchestrator). Attribute values can be
retrieved via the get_attribute
function from the instance model and used as values to other entities within
TOSCA Service Templates.
A.5.9.1.1 Attribute and Property reflection
TOSCA orchestrators automatically create Attribute definitions for any Property definitions declared on the
same TOSCA entity (e.g., nodes, node capabilities and relationships) in order
to make accessible the actual (i.e., the current state) value from the running
instance of the entity.
A.5.9.2 Keynames
The following is the list of recognized keynames
recognized for a TOSCA attribute definition:
|
Keyname
|
Required
|
Type
|
Constraints
|
Description
|
|
type
|
yes
|
string
|
None
|
The required data type for the attribute.
|
|
description
|
no
|
description
|
None
|
The optional description for the attribute.
|
|
default
|
no
|
<any>
|
None
|
An optional key that may provide a value to be used as a
default if not provided by another means.
This value SHALL be type compatible with the type declared
by the property definition’s type keyname.
|
|
status
|
no
|
string
|
default: supported
|
The optional status of the attribute relative to the
specification or implementation. See supported status values defined
under the Property definition
section.
|
|
entry_schema
|
no
|
string
|
None
|
The optional key that is used to declare the name of the Datatype definition for entries of set
types such as the TOSCA list or map.
|
A.5.9.3 Grammar
Attribute definitions have the following grammar:
In the above grammar, the pseudo values that appear
in angle brackets have the following meaning:
·
attribute_name:
represents the required symbolic name of the attribute as a string.
·
attribute_type:
represents the required data type of the attribute.
·
attribute_description:
represents the optional description of
the attribute.
·
default_value: contains a
type-compatible value that may be used as a default if not provided by another
means.
·
status_value: contains a
value indicating the attribute’s status relative to the specification version
(e.g., supported, deprecated, etc.). Supported status values for this keyname
are defined under Property definition.
A.5.9.4 Additional Requirements
·
In addition to any explicitly defined attributes on a TOSCA
entity (e.g., Node Type, RelationshipType, etc.), implementations of the TOSCA Simple
Profile MUST automatically reflect (i.e., make available) any property
defined on an entity as an attribute of the entity with the same name as the
property.
·
Values for the default keyname MUST be derived or
calculated from other attribute or operation output values (that reflect the
actual state of the instance of the corresponding resource) and not hard-coded
or derived from a property settings or inputs (i.e., desired state).
A.5.9.5 Notes
·
Attribute definitions are very similar to Property definitions; however,
properties of entities reflect an input that carries the template author’s
requested or desired value (i.e., desired state) which the orchestrator
(attempts to) use when instantiating the entity whereas attributes reflect the
actual value (i.e., actual state) that provides the actual instantiated value.
o For example, a
property can be used to request the IP address of a node using a property
(setting); however, the actual IP address after the node is instantiated may by
different and made available by an attribute.
A.5.9.6 Example
The following represents a required attribute
definition:
|
actual_cpus:
type: integer
description: Actual number of
CPUs allocated to the node instance.
|
A.5.10
Attribute assignment
This section defines the grammar for assigning values to
named attributes within TOSCA Node and Relationship templates which are defined
in their corresponding named types.
A.5.10.1 Keynames
The TOSCA attribute assignment has no keynames.
A.5.10.2 Grammar
Attribute assignments have the following grammar:
A.5.10.2.1 Short notation:
The following single-line grammar may be used when a
simple value assignment is needed:
|
<attribute_name>: <attribute_value>
| { <attribute_value_expression> }
|
A.5.10.2.2 Extended notation:
The following multi-line grammar may be used when a
value assignment requires keys in addition to a simple value assignment:
|
<attribute_name>:
description:
<attribute_description>
value: <attribute_value> |
{ <attribute_value_expression> }
|
In the above grammars, the pseudo values that appear
in angle brackets have the following meaning:
·
attribute_name:
represents the name of an attribute that would be used to select
an attribute definition with the same name within on a TOSCA entity (e.g., Node
Template, Relationship Template, etc.) which is declared (or reflected from a
Property definition) in its declared type (e.g., a Node Type, Node Template,
Capability Type, etc.).
·
attribute_value, attribute_value_expresssion:
represent the type-compatible value to assign to the named attribute.
Attribute values may be provided as the result from the evaluation of an
expression or a function.
·
attribute_description:
represents the optional description of
the attribute.
A.5.10.3 Additional requirements
·
Attribute values MAY be provided by the underlying
implementation at runtime when requested by the get_attribute function or it MAY
be provided through the evaluation of expressions and/or functions that derive
the values from other TOSCA attributes (also at runtime).
A.5.11 Operation
definition
An operation definition defines a named function or
procedure that can be bound to an implementation artifact (e.g., a script).
A.5.11.1 Keynames
The following is the list of recognized keynames
recognized for a TOSCA operation definition:
|
Keyname
|
Required
|
Type
|
Description
|
|
description
|
no
|
description
|
The optional description string for the associated named
operation.
|
|
implementation
|
no
|
string
|
The optional implementation artifact name (e.g., a script
file name within a TOSCA CSAR file).
|
|
inputs
|
no
|
list of
property definitions
|
The optional list of input properties definitions (i.e.,
parameter definitions) for operation definitions that are within TOSCA Node
or Relationship Type definitions. This includes when operation definitions
are included as part of a Requirement definition in a Node Type.
|
|
no
|
list of
property
assignments
|
The optional list of input property assignments (i.e.,
parameters assignments) for operation definitions that are within TOSCA Node
or Relationship Template definitions. This includes when operation
definitions are included as part of a Requirement assignment in a Node
Template.
|
The following is the list of recognized keynames to
be used with the implementation keyname within a TOSCA operation
definition:
|
Keyname
|
Required
|
Type
|
Description
|
|
primary
|
no
|
string
|
The optional implementation artifact name (e.g., the
primary script file name within a TOSCA CSAR file).
|
|
dependencies
|
no
|
list of
string
|
The optional list of one or more dependent or secondary
implementation artifact name which are referenced by the primary
implementation artifact (e.g., a library the script installs or a secondary
script).
|
A.5.11.2 Grammar
Operation definitions have the following grammars:
A.5.11.2.1 Short notation
The following single-line grammar may be used when
only an operation’s implementation artifact is needed:
A.5.11.2.2 Extended notation for use in Type
definitions
The following multi-line grammar may be used in Node
or Relationship Type definitions when additional information about the
operation is needed:
A.5.11.2.3 Extended notation for use in Template
definitions
The following multi-line grammar may be used in Node
or Relationship Template definitions when additional information about the
operation is needed:
In the above grammars, the pseudo values that appear
in angle brackets have the following meaning:
·
operation_name: represents the required
symbolic name of the operation as a string.
·
operation_description: represents the optional description string for the corresponding operation_name.
·
implementation_artifact_name: represents the
optional name (string) of an implementation
artifact definition (defined elsewhere), or the direct name of an
implementation artifact’s relative filename (e.g., a service template-relative,
path-inclusive filename or absolute file location using a URL).
·
property_definitions: represents the optional
list of property definitions which
the TOSCA orchestrator would make available (i.e., or pass) to the
corresponding implementation artifact during its execution.
·
property_assignments: represents the optional
list of property assignments
for passing parameters to Node or Relationship Template operations providing
values for properties defined in their respective type definitions.
·
list_of_dependent_artifact_names: represents
the optional list of one or more dependent or secondary implementation artifact
name which are referenced by the primary implementation artifact.
A.5.11.3 Additional requirements
·
The default sub-classing behavior for implementations of
operations SHALL be override. That is, implementation artifacts assigned in
subclasses override any defined in its parent class.
·
Template authors may provide property assignments on operation
inputs on templates that do not necessarily have a property definition defined
in its corresponding type.
·
Implementation artifact file names (e.g., script filenames) may
include file directory path names that are relative to the TOSCA service
template file itself when packaged within a TOSCA Cloud Service ARchive (CSAR)
file.
A.5.11.4 Examples
A.5.11.4.1 Single-line implementation example
|
interfaces:
Standard:
start:
implementation:
primary: scripts/start_server.sh
|
A.5.11.4.2 Multi-line implementation example
|
interfaces:
Configure:
pre_configure_source:
implementation:
primary: scripts/pre_configure_source.sh
dependencies:
scripts/setup.sh
binaries/library.rpm
scripts/register.py
|
A.5.12 Interface
definition
An interface definition defines a named interface that can
be associated with a Node or Relationship Type
A.5.12.1 Keynames
The following is the list of recognized keynames
recognized for a TOSCA interface definition:
|
Keyname
|
Required
|
Type
|
Description
|
|
inputs
|
no
|
list of
property definitions
|
The optional list of input property definitions available
to all defined operations for interface definitions that are within TOSCA
Node or Relationship Type definitions. This includes when interface
definitions are included as part of a Requirement definition in a Node Type.
|
|
no
|
list of
property
assignments
|
The optional list of input property assignments (i.e.,
parameters assignments) for interface definitions that are within TOSCA Node
or Relationship Template definitions. This includes when interface
definitions are referenced as part of a Requirement assignment in a Node
Template.
|
A.5.12.2 Grammar
Interface definitions have the following grammar:
A.5.12.2.1 Extended notation for use in Type
definitions
The following multi-line grammar may be used in Node
or Relationship Type definitions:
A.5.12.2.2 Extended notation for use in Template
definitions
The following multi-line grammar may be used in Node
or Relationship Type definitions:
In the above grammars, the pseudo values that appear
in angle brackets have the following meaning:
·
interface_definition_name: represents the
required symbolic name of the interface as a string.
·
interface_type_name: represents the required name of the Interface
Type for the interface definition.
·
property_definitions: represents the optional
list of property definitions (i.e.,
parameters) which the TOSCA orchestrator would make available (i.e., or pass)
to all defined operations.
-
This means these properties and their values would be accessible to
the implementation artifacts (e.g., scripts) associated to each operation
during their execution.
·
property_assignments: represents the optional
list of property assignments
for passing parameters to Node or Relationship Template operations providing
values for properties defined in their respective type definitions.
·
operation_definitions: represents
the required name of one or more operation
definitions.
A.6 Type-specific definitions
A.6.1 Capability
definition
A capability definition defines a named, typed set of data that
can be associated with Node Type or Node Template to describe a transparent
capability or feature of the software component the node describes.
A.6.1.1 Keynames
The following is the list of recognized keynames for
a TOSCA capability definition:
|
Keyname
|
Required
|
Type
|
Constraints
|
Description
|
|
type
|
yes
|
string
|
N/A
|
The required name of the Capability Type the capability
definition is based upon.
|
|
description
|
no
|
description
|
N/A
|
The optional description of the Capability definition.
|
|
properties
|
no
|
list of
property definitions
|
N/A
|
An optional list of property definitions for the
Capability definition.
|
|
attributes
|
no
|
list of
attribute
definitions
|
N/A
|
An optional list of attribute definitions for the
Capability definition.
|
|
valid_source_types
|
no
|
string[]
|
N/A
|
An optional list of one or more valid names of Node Types
that are supported as valid sources of any relationship established to the
declared Capability Type.
|
|
occurrences
|
no
|
range of integer
|
implied default of [1,UNBOUNDED]
|
The optional minimum and maximum occurrences for the
capability. By default, an exported Capability should allow at least one
relationship to be formed with it with a maximum of UNBOUNDED relationships.
Note: the keyword UNBOUNDED
is also supported to represent any positive integer.
|
A.6.1.2 Grammar
Capability definitions have one of the following
grammars:
A.6.1.2.1 Short notation
The following grammar may be used when only a list
of capability definition names needs to be declared:
A.6.1.2.2 Extended notation
The following multi-line grammar may be used when
additional information on the capability definition is needed:
In the above grammars, the pseudo values that appear
in angle brackets have the following meaning:
·
capability_definition_name:
represents the symbolic name of the capability as a string.
·
capability_type:
represents the required name of a capability
type the capability definition is based upon.
·
capability_description: represents the optional
description of the capability
definition.
·
property_definitions: represents the optional
list of property definitions for the
capability definition.
·
attribute_definitions: represents the optional
list of attribute definitions for
the capability definition.
·
node_type_names:
represents the optional list of one or more names of Node Types that the Capability definition
supports as valid sources for a successful relationship to be established to
itself.
A.6.1.3 Examples
The following examples show capability definitions
in both simple and full forms:
A.6.1.3.1 Simple notation example
|
# Simple notation, no properties
defined or augmented
some_capability:
mytypes.mycapabilities.MyCapabilityTypeName
|
A.6.1.3.2 Full notation
example
|
# Full notation, augmenting
properties of the referenced capability type
some_capability:
type: mytypes.mycapabilities.MyCapabilityTypeName
properties:
limit:
type: integer
default: 100
|
A.6.1.4 Additional requirements
·
Any Node Type (names) provides as values for the valid_source_types
keyname SHALL be type-compatible (i.e., derived from the same parent Node Type)
with any Node Types defined using the same keyname in the parent Capability
Type.
·
Capability symbolic names SHALL be unique; it is an error if a
capability name is found to occur more than once.
A.6.1.5 Notes
- The Capability
Type, in this example MyCapabilityTypeName, would be defined elsewhere and have an integer
property named limit.
- This definition directly maps to the CapabilitiesDefinition of the Node Type
entity as defined in the TOSCA v1.0 specification.
A.6.2 Requirement
definition
The Requirement definition describes a named requirement
(dependencies) of a TOSCA Node Type or Node template which needs to be
fulfilled by a matching Capability definition declared by another TOSCA
modelable entity. The requirement definition may itself include the specific
name of the fulfilling entity (explicitly) or provide an abstract type, along
with additional filtering characteristics, that a TOSCA orchestrator can use to
fulfil the capability at runtime (implicitly).
A.6.2.1 Keynames
The following is the list of recognized keynames for
a TOSCA requirement definition:
|
Keyname
|
Required
|
Type
|
Constraints
|
Description
|
|
capability
|
yes
|
string
|
N/A
|
The required reserved keyname used that can be used to
provide the name of a valid Capability
Type that can fulfil the requirement.
|
|
node
|
no
|
string
|
N/A
|
The optional reserved keyname used to provide the name of
a valid Node Type that contains the
capability definition that can be used to fulfil the requirement.
|
|
relationship
|
no
|
string
|
N/A
|
The optional reserved keyname used to provide the name of
a valid Relationship Type to
construct when fulfilling the requirement.
|
|
occurrences
|
no
|
range of integer
|
implied default of [1,1]
|
The optional minimum and maximum occurrences for the
requirement.
Note: the keyword UNBOUNDED
is also supported to represent any positive integer.
|
A.6.2.1.1 Additional Keynames for multi-line
relationship grammar
The Requirement definition contains the Relationship
Type information needed by TOSCA Orchestrators to construct relationships to
other TOSCA nodes with matching capabilities; however, it is sometimes
recognized that additional properties may need to be passed to the relationship
(perhaps for configuration). In these cases, additional grammar is provided so
that the Node Type may declare additional Property definitions to be used as
inputs to the Relationship Type’s declared interfaces (or specific operations
of those interfaces).
|
Keyname
|
Required
|
Type
|
Constraints
|
Description
|
|
type
|
yes
|
string
|
N/A
|
The optional reserved keyname used to provide the name of
the Relationship Type for the requirement definition’s relationship keyname.
|
|
interfaces
|
no
|
list of interface
definitions
|
N/A
|
The optional reserved keyname used to reference declared
(named) interface definitions of the corresponding Relationship Type in order
to declare additional Property definitions for these interfaces or operations
of these interfaces.
|
A.6.2.2 Grammar
Requirement definitions have one of the following
grammars:
A.6.2.2.1 Simple grammar (Capability Type only)
A.6.2.2.2 Extended grammar (with Node and Relationship
Types)
A.6.2.2.3 Extended grammar for declaring Property
Definitions on the relationship’s Interfaces
The following additional multi-line grammar is
provided for the relationship keyname in order to declare new Property
definitions for inputs of known Interface definitions of the declared
Relationship Type.
In the above grammars, the pseudo values that appear
in angle brackets have the following meaning:
·
requirement_name: represents the required
symbolic name of the requirement definition as a string.
·
capability_type_name: represents the required
name of a Capability type that can be used to fulfil the requirement.
·
node_type_name: represents the optional name of
a TOSCA Node Type that contains the Capability Type definition the requirement
can be fulfilled by.
·
relationship_type_name: represents the optional
name of a Relationship Type to be
used to construct a relationship between this requirement definition (i.e., in
the source node) to a matching capability definition (in a target node).
·
min_occurrences, max_occurrences: represents
the optional minimum and maximum occurrences of the requirement (i.e., its
cardinality).
·
interface_definitions: represents one or more
already declared interfaces in the Relationship Type (as declared on the type
keyname) allowing for the declaration of new Property definition for these
interfaces or for specific Operation definitions of these interfaces.
A.6.2.3 Additional Requirements
·
Requirement symbolic names SHALL be unique; it is an error if a
requirement name is found to occur more than once.
·
If the occurrences keyname is not present, then
the occurrence of the requirement SHALL be one and only one; that is a
default declaration as follows would be assumed:
o
occurrences: [1,1]
A.6.2.4 Notes
·
This element directly maps to the RequirementsDefinition
of the Node Type entity as defined in the TOSCA v1.0
specification.
·
The requirement symbolic name is used for identification of the
requirement definition only and not relied upon for establishing any
relationships in the topology.
A.6.2.5 Requirement Type definition is a tuple
A requirement definition allows type designers to govern
which types are allowed (valid) for fulfillment using three levels of
specificity with only the Capability Type being required.
1. Node
Type (optional)
2. Relationship
Type (optional)
3. Capability
Type (required)
The first level allows selection, as shown in both
the simple or complex grammar, simply providing the node’s type using the node
keyname. The second level allows specification of the relationship type to use
when connecting the requirement to the capability using the relationship
keyname. Finally, the specific named capability type on the target node is
provided using the capability keyname.
A.6.2.5.1 Property filter
In addition to the node, relationship and capability types,
a filter, with the keyname node_filter,
may be provided to constrain the allowed set of potential target nodes based
upon their properties and their capabilities’ properties. This allows TOSCA
orchestrators to help find the “best fit” when selecting among multiple
potential target nodes for the expressed requirements.
A.6.3 Artifact Type
An Artifact Type is a reusable entity that defines the type
of one or more files which Node Types or Node Templates can have dependent
relationships and used during operations such as during installation or
deployment.
A.6.3.1 Keynames
The following is the list of recognized keynames for
a TOSCA Artifact Type definition:
|
Keyname
|
Required
|
Type
|
Description
|
|
derived_from
|
no
|
string
|
An optional parent Artifact Type name the Artifact Type
derives from.
|
|
description
|
no
|
description
|
An optional description for the Artifact Type.
|
|
mime_type
|
no
|
string
|
The required mime type property for the Artifact Type.
|
|
file_ext
|
no
|
string[]
|
The required file extension property for the Artifact
Type.
|
|
properties
|
no
|
list of
property definitions
|
An optional list of property definitions for the Artifact
Type.
|
A.6.3.2 Grammar
Artifact Types have following grammar:
In the above grammar, the pseudo values that appear
in angle brackets have the following meaning:
·
artifact_type_name: represents the name of the
Artifact Type being declared as a string.
·
parent_artifact_type_name: represents the name of the Artifact
Type this Artifact Type definition derives from (i.e., its “parent” type).
·
artifact_description: represents the
optional description string for the
Artifact Type.
·
mime_type_string: represents the optional Multipurpose
Internet Mail Extensions (MIME) standard string value that describes the file
contents for this type of Artifact Type as a string.
·
file_extensions: represents the optional list
of one or more recognized file extensions for this type of artifact type as strings.
·
property_definitions: represents the optional
list of property definitions for the
artifact type.
A.6.3.3 Examples
|
my_artifact_type:
description: Java Archive
artifact type
derived_from:
tosca.artifact.Root
mime_type: application/java-archive
file_ext: [ jar ]
|
A.6.4 Interface Type
An Interface Type is a reusable entity that
describes a set of operations that can be used to interact with or manage a
node or relationship in a TOSCA topology.
A.6.4.1 Keynames
The following is the list of recognized keynames for
a TOSCA Interface Type definition:
|
Keyname
|
Required
|
Type
|
Description
|
|
inputs
|
no
|
list of
property definitions
|
The optional list of input parameter definitions.
|
A.6.4.2 Grammar
Interface Types have following grammar:
In the above grammar, the pseudo values that appear
in angle brackets have the following meaning:
- interface_type_name:
represents the required name of the interface as a string.
- property_definitions:
represents the optional list of property
definitions (i.e., parameters) which the TOSCA orchestrator would make
available (i.e., or pass) to all implementation artifacts for operations
declared on the interface during their execution.
- operation_definitions:
represents the required list of one or more operation definitions.
A.6.4.3 Example
The following example shows a custom interface used
to define multiple configure operations.
|
mycompany.mytypes.myinterfaces.MyConfigure:
inputs:
mode:
type: string
pre_configure_service:
description: pre-configure
operation for my service
post_configure_service:
description: post-configure
operation for my service
|
A.6.4.4 Additional Requirements
·
Interface Types MUST NOT include any implementations for
defined operations; that is, the implementation keyname is invalid.
A.6.4.5 Notes
·
The TOSCA Simple Profile specification does not yet provide a
means to derive or extend an Interface Type from another Interface Type.
A.6.5 Data Type
A Data Type definition defines the schema for new named
datatypes in TOSCA.
A.6.5.1 Keynames
The following is the list of recognized keynames for
a TOSCA Data Type definition:
|
Keyname
|
Required
|
Type
|
Description
|
|
derived_from
|
no
|
string
|
The optional key used when a
datatype is derived from an existing TOSCA Data Type.
|
|
description
|
no
|
description
|
The optional description for the
Data Type.
|
|
constraints
|
no
|
list of
constraint clauses
|
The optional list of sequenced
constraint clauses for the Data Type.
|
|
properties
|
no
|
list of
property definitions
|
The optional list property
definitions that comprise the schema for a complex Data Type in TOSCA.
|
A.6.5.2 Grammar
Data Types have the following grammar:
In the above grammar, the pseudo values that appear
in angle brackets have the following meaning:
·
data_type_name:
represents the required symbolic name of the datatype as a string.
·
datatype_description: represents the optional description for the datatype.
·
existing_type_name:
represents the optional name of a valid TOSCA type this new datatype
would derive from.
·
type_constraints:
represents the optional sequenced list of one or more
type-compatible constraint clauses
that restrict the datatype.
·
property_definitions:
represents the optional list of one or more property
definitions that provide the schema for the datatype.
A.6.5.3 Additional Requirements
·
A valid datatype definition MUST have either a valid derived_from
declaration or at least one valid property definition.
·
Any constraint
clauses SHALL be type-compatible with the type declared by the derived_from
keyname.
·
If a properties keyname is provided, it SHALL contain
one or more valid property definitions.
A.6.5.4 Examples
The following example represents a datatype definition based
upon an existing string type:
A.6.5.4.1 Defining a complex datatype
|
# define a new complex
datatype
mytypes.phonenumber:
description: my phone
number datatype
properties:
countrycode:
type: integer
areacode:
type: integer
number:
type: integer
|
A.6.5.4.2 Defining a datatype derived from an
existing datatype
|
# define a new datatype
that derives from existing type and extends it
mytypes.phonenumber.extended:
derived_from:
mytypes.phonenumber
description: custom
phone number type that extends the basic phonenumber type
properties:
phone_description:
type: string
constraints:
- max_length:
128
|
A.6.6 Capability
Type
A Capability Type is a reusable entity that
describes a kind of capability that a Node Type can declare to expose.
Requirements (implicit or explicit) that are declared as part of one node can
be matched to (i.e., fulfilled by) the Capabilities declared by another node.
A.6.6.1 Keynames
The following is the list of recognized keynames for
a TOSCA Capability Type definition:
|
Keyname
|
Required
|
Type
|
Description
|
|
derived_from
|
no
|
string
|
An optional parent capability type name this new
Capability Type derives from.
|
|
description
|
no
|
description
|
An optional description for the Capability Type.
|
|
properties
|
no
|
list of
property definitions
|
An optional list of property definitions for the
Capability Type.
|
|
attributes
|
no
|
list of
attribute
definitions
|
An optional list of attribute definitions for the
Capability Type.
|
|
valid_source_types
|
no
|
string[]
|
An optional list of one or more valid names of Node Types
that are supported as valid sources of any relationship established to the
declared Capability Type.
|
A.6.6.2 Grammar
Capability Types have following grammar:
In the above grammar, the pseudo values that appear
in angle brackets have the following meaning:
·
capability_type_name: represents the required
name of the Capability Type being declared as a string.
·
parent_capability_type_name: represents the
name of the Capability Type this
Capability Type definition derives from (i.e., its “parent” type).
·
capability_description: represents the optional
description string for the
corresponding capability_type_name.
·
property_definitions: represents an optional
list of property definitions that the
Capability type exports.
·
attribute_definitions: represents the optional
list of attribute definitions for the
Capability Type.
·
node_type_names: represents the optional list
of one or more names of Node Types that
the Capability Type supports as valid sources for a successful relationship to
be established to itself.
A.6.6.3 Example
|
mycompany.mytypes.myapplication.MyFeature:
derived_from:
tosca.capabilities.Root
description: a custom feature of
my company’s application
properties:
my_feature_setting:
type: string
my_feature_value:
type: integer
|
A.6.7 Requirement Type
A Requirement Type is a reusable entity that
describes a kind of requirement that a Node Type can declare to expose. The
TOSCA Simple Profile seeks to simplify the need for declaring specific
Requirement Types from nodes and instead rely upon nodes declaring their
features sets using TOSCA Capability Types along with a named Feature notation.
Currently, there are no use cases in this TOSCA Simple
Profile in YAML specification that utilize an independently defined Requirement
Type. This is a desired effect as part of the simplification of the TOSCA v1.0
specification.
A.6.8 Node Type
A Node Type is a reusable entity that defines the type of
one or more Node Templates. As such, a Node Type defines the structure of observable
properties via a Properties Definition, the Requirements and Capabilities of
the node as well as its supported interfaces.
A.6.8.1 Keynames
The following is the list of recognized keynames for
a TOSCA Node Type definition:
|
Keyname
|
Required
|
Definition/Type
|
Description
|
|
derived_from
|
no
|
string
|
An optional parent Node Type name this new Node Type
derives from.
|
|
description
|
no
|
description
|
An optional description for the Node Type.
|
|
properties
|
no
|
list of
property definitions
|
An optional list of property definitions for the Node
Type.
|
|
attributes
|
no
|
list of
attribute
definitions
|
An optional list of attribute definitions for the Node
Type.
|
|
requirements
|
no
|
list of
requirement definitions
|
An optional sequenced list of requirement
definitions for the Node Type.
|
|
capabilities
|
no
|
list of
capability
definitions
|
An optional list of capability definitions for the Node
Type.
|
|
interfaces
|
no
|
list of
interface definitions
|
An optional list of interface definitions supported by the
Node Type.
|
|
artifacts
|
no
|
list of
artifacts definitions
|
An optional list of named artifact definitions for the
Node Type.
|
A.6.8.2 Grammar
Node Types have following grammar:
In the above grammar, the
pseudo values that appear in angle brackets have the following meaning:
·
node_type_name: represents the required
symbolic name of the Node Type being declared.
·
parent_node_type_name: represents the name (string) of the Node
Type this Node Type definition derives from (i.e., its “parent” type).
·
node_type_description: represents the optional description string for the corresponding node_type_name.
·
property_definitions: represents the optional
list of property definitions for the
Node Type.
·
attribute_definitions: represents the optional
list of attribute definitions for
the Node Type.
·
requirement_definitions: represents the
optional sequenced list of requirement
definitions for the Node Type.
·
capability_definitions: represents the optional
list of capability definitions for
the Node Type.
·
interface_definitions: represents the optional
list of one or more interface definitions
supported by the Node Type.
·
artifact_definitions: represents the optional
list of artifact definitions for the
Node Template that augment those provided by its declared Node Type.
A.6.8.3 Additional Requirements
·
Requirements are intentionally expressed as a sequenced list of
TOSCA Requirement definitions which
SHOULD be resolved (processed) in sequence order by TOSCA Orchestrators. .
A.6.8.4 Best Practices
·
It is recommended that all Node Types SHOULD derive directly (as
a parent) or indirectly (as an ancestor) of the TOSCA Root Node Type (i.e., tosca.nodes.Root) to promote compatibility
and portability. However, it is permitted to author Node Types that do not do
so.
·
TOSCA Orchestrators, having a full view of the complete
application topology template and its resultant dependency graph of nodes and
relationships, MAY prioritize how they instantiate the nodes and
relationships for the application (perhaps in parallel where possible) to
achieve the greatest efficiency
A.6.8.5 Example
|
my_company.my_types.my_app_node_type:
derived_from:
tosca.nodes.SoftwareComponent
description: My company’s custom
applicaton
properties:
my_app_password:
type: string
description: application
password
constraints:
- min_length: 6
- max_length: 10
attributes:
my_app_port:
type: integer
description: application
port number
requirements:
- some_database:
capability:
EndPoint.Database
node: Database
relationship: ConnectsTo
|
A.6.9 Relationship
Type
A Relationship Type is a reusable entity that defines the
type of one or more relationships between Node Types or Node Templates.
A.6.9.1 Keynames
The following is the list of recognized keynames for
a TOSCA Relationship Type definition:
|
Keyname
|
Required
|
Definition/Type
|
Description
|
|
derived_from
|
no
|
string
|
An optional parent Relationship Type name the Relationship
Type derives from.
|
|
description
|
no
|
description
|
An optional description for the Relationship Type.
|
|
properties
|
no
|
list of
property definitions
|
An optional list of property definitions for the
Relationship Type.
|
|
attributes
|
no
|
list of
attribute
definitions
|
An optional list of attribute definitions for the
Relationship Type.
|
|
interfaces
|
no
|
list of
interface
definitions
|
An optional list of interface definitions interfaces
supported by the Relationship Type.
|
|
valid_target_types
|
no
|
string[]
|
An optional list of one or more names of Capability Types
that are valid targets for this relationship.
|
A.6.9.2 Grammar
Relationship Types have following grammar:
In the above grammar, the pseudo values that appear
in angle brackets have the following meaning:
·
relationship_type_name: represents the required
symbolic name of the Relationship Type being declared as a string.
·
parent_relationship_type_name: represents the
name (string) of the Relationship Type this Relationship
Type definition derives from (i.e., its “parent” type).
·
relationship_description: represents the
optional description string for the
corresponding relationship_type_name.
·
property_definitions: represents the optional
list of property definitions for the
Relationship Type.
·
attribute_definitions: represents the optional
list of attribute definitions for
the Relationship Type.
·
interface_definitions: represents the optional
list of one or more names of valid interface
definitions supported by the Relationship Type.
·
capability_type_names: represents one or more
names of valid target types for the relationship (i.e., Capability Types).
A.6.9.3 Best Practices
·
For TOSCA application portability, it is recommended that designers
use the normative Relationship types defined in this specification where
possible and derive from them for customization purposes.
·
The TOSCA Root Relationship Type (tosca.relationships.Root)
SHOULD be used to derive new types where possible when defining new
relationships types. This assures that its normative configuration interface
(tosca.interfaces.relationship.Configure) can be used in a deterministic way by
TOSCA orchestrators.
A.6.9.4 Examples
|
mycompanytypes.myrelationships.AppDependency:
derived_from:
tosca.relationships.DependsOn
valid_target_types: [ mycompanytypes.mycapabilities.SomeAppCapability
]
|
A.7 Template-specific
definitions
The definitions in this section provide reusable modeling
element grammars that are specific to the Node or Relationship templates.
A.7.1 Capability
assignment
A capability assignment allows node template authors to
assign values to properties and attributes for a named capability definition
that is part of a Node Template’s type definition.
A.7.1.1 Keynames
The following is the list of recognized keynames for
a TOSCA capability assignment:
|
Keyname
|
Required
|
Type
|
Description
|
|
properties
|
no
|
list of
property
assignments
|
An optional list of property definitions for the
Capability definition.
|
|
attributes
|
no
|
list of
attribute
assignments
|
An optional list of attribute definitions for the
Capability definition.
|
A.7.1.2 Grammar
Capability assignments have one of the following
grammars:
In the above grammars, the pseudo values that appear
in angle brackets have the following meaning:
·
capability_definition_name: represents the symbolic name
of the capability as a string.
·
property_assignments: represents the optional
list of property assignments
for the capability definition.
·
attribute_assignments: represents the optional
list of attribute
assignments for the capability definition.
A.7.1.3
Example
The following example shows a capability assignment:
A.7.1.3.1 Notation example
|
node_templates:
some_node_template:
capabilities:
some_capability:
properties:
limit: 100
|
A.7.2 Requirement assignment
A Requirement assignment allows template authors to provide
either concrete names of TOSCA templates or provide abstract selection criteria
for providers to use to find matching TOSCA templates that are used to fulfill
a named requirement’s declared TOSCA Node Type.
A.7.2.1 Keynames
The following is the list of recognized keynames for
a TOSCA requirement assignment:
|
Keyname
|
Required
|
Type
|
Description
|
|
capability
|
no
|
string
|
The optional reserved keyname used to provide the name of
either a:
·
Capability definition within a target node
template that can fulfill the requirement.
·
Capability Type that the provider will use to select a
type-compatible target node template to fulfill the requirement at
runtime.
|
|
node
|
no
|
string
|
The optional reserved keyname used to identify the target
node of a relationship. specifically, it is used to provide either a:
·
Node Template name that can fulfil the target node
requirement.
·
Node Type name that the provider will use to select a
type-compatible node template to fulfil the requirement at runtime.
|
|
relationship
|
no
|
string
|
The optional reserved keyname used to provide the name of
either a:
·
Relationship Template to use to relate the source
node to the (capability in the) target node when fulfilling the
requirement.
·
Relationship Type that the provider will use to select a
type-compatible relationship template to relate the source node to the
target node at runtime.
|
|
node_filter
|
no
|
node filter
|
The optional filter definition that TOSCA orchestrators or
providers would use to select a type-compatible target node that can
fulfill the associated abstract requirement at runtime.
|
The following is the list of recognized keynames for
a TOSCA requirement assignment’s relationship keyname
which is used when Property assignments need to be provided to inputs of
declared interfaces or their operations:
|
Keyname
|
Required
|
Type
|
Description
|
|
type
|
no
|
string
|
The optional reserved keyname used to provide the name of
the Relationship Type for the requirement assignment’s relationship keyname.
|
|
properties
|
no
|
list of
interface
definitions
|
The optional reserved keyname used to reference declared
(named) interface definitions of the corresponding Relationship Type in order
to provide Property assignments for these interfaces or operations of these
interfaces.
|
A.7.2.2 Grammar
Named requirement assignments have one of the
following grammars:
A.7.2.2.1 Short notation:
The following single-line grammar may be used if only
a concrete Node Template for the target node needs to be declared in the
requirement:
This notation is only valid if the corresponding
Requirement definition in the Node Template’s parent Node Type declares (at a
minimum) a valid Capability Type which can be found in the declared target Node
Template. A valid capability definition always needs to be provided in the
requirement declaration of the source node to identify a specific
capability definition in the target node the requirement will form a
TOSCA relationship with.
A.7.2.2.2 Extended notation:
The following grammar would be used if the
requirement assignment needs to provide more information than just the Node
Template name:
A.7.2.2.3 Extended grammar with Property Assignments
for the relationship’s Interfaces
The following additional multi-line grammar is
provided for the relationship keyname in order to provide new Property
assignments for inputs of known Interface definitions of the declared
Relationship Type.
Examples of uses for the extended requirement
assignment grammar include:
·
The need to allow runtime selection of the target node based upon
an abstract Node Type rather than a concrete Node Template. This may include
use of the node_filter keyname to provide node and capability filtering
information to find the “best match” of a concrete Node Template at runtime.
·
The need to further clarify the concrete Relationship Template or
abstract Relationship Type to use when relating the source node’s requirement
to the target node’s capability.
·
The need to further clarify the concrete capability (symbolic)
name or abstract Capability Type in the target node to form a relationship
between.
·
The need to (further) constrain the occurrences of the
requirement in the instance model.
In the above grammars, the pseudo values that appear
in angle brackets have the following meaning:
·
requirement_name: represents the symbolic name
of a requirement assignment as a string.
·
node_template_name: represents the optional name
of a Node Template that contains the capability this requirement will be
fulfilled by.
·
relationship_template_name: represents the
optional name of a Relationship Type
to be used when relating the requirement appears to the capability in the
target node.
·
capability_symbolic_name: represents the
optional ordered list of specific, required capability type or named capability
definition within the target Node Type or Template.
·
node_type_name: represents the optional name of
a TOSCA Node Type the associated named requirement can be fulfilled by. This
must be a type that is compatible with the Node Type declared on the matching
requirement (same symbolic name) the requirement’s Node Template is based upon.
·
relationship_type_name: represents the optional
name of a Relationship Type that
is compatible with the Capability Type in the target node.
·
property_assignments: represents the optional
list of property value assignments for the declared relationship.
·
interface_assignments: represents the optional
list of interface definitions for the declared relationship used to provide
property assignments on inputs of interfaces and operations.
·
capability_type_name: represents the optional
name of a Capability Type definition within the target Node Type this
requirement needs to form a relationship with.
·
node_filter_definition: represents the optional
node filter TOSCA orchestrators
would use to fulfill the requirement for selecting a target node. Note that
this SHALL only be valid if the node keyname’s value is
a Node Type and is invalid if it is a Node Template.
A.7.2.3 Examples
A.7.2.3.1 Example 1 – Abstract hosting requirement on
a Node Type
A web application node template named ‘my_application_node_template’
of type WebApplication declares a requirement named ‘host’
that needs to be fulfilled by any node that derives from the node type WebServer.
In this case, the node template’s type is WebApplication
which already declares the Relationship Type HostedOn to use to
relate to the target node and the Capability Type of Container
to be the specific target of the requirement in the target node.
A.7.2.3.2 Example 2 - Requirement with Node Template
and a custom Relationship Type
This example is similar to the previous example; however,
the requirement named ‘database’ describes a requirement for a connection
to a database endpoint (Endpoint.Database)
Capability Type in a named node template (my_database). However,
the connection requires a custom Relationship Type (my.types.CustomDbConnection’)
declared on the keyname ‘relationship’.
|
# Example of a (database)
requirement that is fulfilled by a node template named
# “my_database”, but also requires
a custom database connection relationship
my_application_node_template:
requirements:
- database:
node: my_database
capability: Endpoint.Database
relationship:
my.types.CustomDbConnection
|
A.7.2.3.3 Example 3 - Requirement for a Compute node
with additional selection criteria (filter)
This example shows how to
extend an abstract ‘host’ requirement for a Compute node
with a filter definition that further constrains TOSCA orchestrators to include
additional properties and capabilities on the target node when fulfilling the
requirement.
A.7.3 Node Template
A Node Template specifies the occurrence of a manageable
software component as part of an application’s topology model which is defined
in a TOSCA Service Template. A Node template is an instance of a specified
Node Type and can provide customized properties, constraints or operations
which override the defaults provided by its Node Type and its implementations.
A.7.3.1 Keynames
The following is the list of recognized keynames for
a TOSCA Node Template definition:
|
Keyname
|
Required
|
Type
|
Description
|
|
type
|
yes
|
string
|
The required name of the Node Type the Node Template is
based upon.
|
|
description
|
no
|
description
|
An optional description for the Node Template.
|
|
directives
|
no
|
string[]
|
An optional list of directive values to provide processing
instructions to orchestrators and tooling.
|
|
properties
|
no
|
list of
property
assignments
|
An optional list of property value assignments for the
Node Template.
|
|
attributes
|
no
|
list of
attribute
assignments
|
An optional list of attribute value assignments for the
Node Template.
|
|
requirements
|
no
|
list of
requirement
assignments
|
An optional sequenced list of requirement
assignments for the Node Template.
|
|
capabilities
|
no
|
list of
capability
assignments
|
An optional list of capability assignments for the Node
Template.
|
|
interfaces
|
no
|
list of
interface definitions
|
An optional list of named interface definitions for the
Node Template.
|
|
artifacts
|
no
|
list of
artifact definitions
|
An optional list of named artifact definitions for the
Node Template.
|
|
node_filter
|
no
|
node filter
|
The optional filter definition that TOSCA orchestrators
would use to select the correct target node. This keyname is only valid if
the directive has the value of “selectable” set.
|
|
copy
|
no
|
string
|
The optional (symbolic) name of another node template to
copy into (all keynames and values) and use as a basis for this node
template.
|
A.7.3.2 Grammar
In the above grammar, the pseudo values that appear
in angle brackets have the following meaning:
·
node_template_name: represents the required
symbolic name of the Node Template being declared.
·
node_type_name: represents the name of the Node
Type the Node Template is based upon.
·
node_template_description: represents the
optional description string for Node
Template.
·
directives: represents the optional list of
processing instruction keywords for treatment of the node for tooling and
orchestrators.
·
property_assignments: represents the optional
list of property assignments
for the Node Template that provide values for properties defined in its
declared Node Type.
·
attribute_assignments: represents the optional
list of attribute
assignments for the Node Template that provide values for attributes
defined in its declared Node Type.
·
requirement_assignments: represents the
optional sequenced list of requirement assignments for the
Node Template that allow assignment of type-compatible capabilities, target
nodes, relationships and target (node filters) for use when fulfilling the
requirement at runtime.
·
capability_assignments: represents the optional
list of capability assignments
for the Node Template that augment those provided by its declared Node Type.
·
interface_definitions: represents the optional
list of interface definitions for the
Node Template that augment those provided by its declared Node Type.
·
artifact_definitions: represents the optional
list of artifact definitions for the
Node Template that augment those provided by its declared Node Type.
·
node_filter_definition: represents the optional
node filter TOSCA orchestrators
would use for selecting a matching node template.
·
source_node_template_name: represents the
optional (symbolic) name of another node template to copy into (all keynames
and values) and use as a basis for this node template.
A.7.3.3 Additional requirements
·
The node_filter keyword (and supporting grammar) SHALL
only be valid if the Node Template has a directive keyname with
the value of “selectable” set.
·
The source node template provided as a value on the copy
keyname MUST NOT itself use the copy keyname (i.e., it
must itself be a complete node template description and not copied from another
node template).
A.7.3.4 Example
|
node_templates:
mysql:
type: tosca.nodes.DBMS.MySQL
properties:
root_password: { get_input:
my_mysql_rootpw }
port: { get_input:
my_mysql_port }
requirements:
- host: db_server
interfaces:
Standard:
configure:
scripts/my_own_configure.sh
|
A.7.4 Relationship Template
A Relationship Template specifies the occurrence of a
manageable relationship between node templates as part of an application’s
topology model which is defined in a TOSCA Service Template. A Relationship
template is an instance of a specified Relationship Type and can provide
customized properties, constraints or operations which override the defaults
provided by its Relationship Type and its implementations.
The following is the list of recognized keynames for
a TOSCA Relationship Template definition:
|
Keyname
|
Required
|
Type
|
Description
|
|
type
|
yes
|
string
|
The required name of the Relationship Type the
Relationship Template is based upon.
|
|
alias
|
no
|
string
|
The optional name of a different Relationship Template
definition whose values are (effectively) copied into the definition for this
Relationship Template (prior to any other overrides).
|
|
description
|
no
|
description
|
An optional description for the Relationship Template.
|
|
properties
|
no
|
list of
property
assignments
|
An optional list of property assignments for the
Relationship Template.
|
|
attributes
|
no
|
list of
attribute
assignments
|
An optional list of attribute assignments for the
Relationship Template.
|
|
interfaces
|
no
|
list of
interface definitions
|
An optional list of named interface definitions for the
Node Template.
|
|
copy
|
no
|
name
|
The optional (symbolic) name of another relationship
template to copy into (all keynames and values) and use as a basis for this
relationship template.
|
A.7.4.1 Grammar
In the above grammar, the pseudo values that appear
in angle brackets have the following meaning:
·
relationship_template_name: represents the
required symbolic name of the Relationship Template being declared.
·
relationship_type_name: represents the name of
the Relationship Type the Relationship Template is based upon.
·
relationship_template_description: represents
the optional description string for the
Relationship Template.
·
property_assignments: represents the optional
list of property assignments
for the Relationship Template that provide values for properties defined in its
declared Relationship Type.
·
attribute_assignments: represents the optional
list of attribute
assignments for the Relationship Template that provide values for
attributes defined in its declared Relationship Type.
·
interface_definitions: represents the optional
list of interface definitions for the
Relationship Template that augment those provided by its declared
Relationship Type.
·
source_relationship_template_name: represents
the optional (symbolic) name of another relationship template to copy into (all
keynames and values) and use as a basis for this relationship template.
A.7.4.2 Additional requirements
·
The source relationship template provided as a value on the copy
keyname MUST NOT itself use the copy keyname (i.e., it must
itself be a complete relationship template description and not copied from
another relationship template).
A.7.4.3 Example
A.8 Topology Template definition
This section defines the topology template of a cloud
application. The main ingredients of the topology template are node templates
representing components of the application and relationship templates
representing links between the components. These elements are defined in the
nested node_templates section and the
nested relationship_templates sections,
respectively. Furthermore, a topology template allows for defining input
parameters, output parameters as well as grouping of node templates.
A.8.1 Grammar
The overall grammar of the topology_template
section is shown below.–Detailed grammar definitions of the each sub-sections
are provided in subsequent subsections.
|
topology_template:
description:
# a description of the
topology template
inputs:
# definition of input
parameters for the topology template
node_templates:
# definition of the node
templates of the topology
relationship_templates:
# definition of the
relationship templates of the topology
outputs:
# definition of output
parameters for the topology template
groups:
# definition of logical groups
of node templates within the topology
substitution_mappings:
node_type: <node_type_name>
capabilities:
<map_of_capability_mappings_to_expose>
requirements:
<map_of_requirement_mapping_to_expose>
|
A.8.1.1 inputs
The inputs section
provides a means to define parameters using TOSCA property definitions, their
allowed values via constraints and default values within a TOSCA Simple Profile
template. Input parameters defined in the inputs
section of a topology template can be mapped to properties of node templates or
relationship templates within the same topology template and can thus be used
for parameterizing the instantiation of the topology template.
This section defines topology template-level input parameter
section.
·
Inputs here would ideally be mapped to BoundaryDefinitions in
TOSCA v1.0.
·
Treat input parameters as fixed global variables (not settable
within template)
·
If not in input take default (nodes use default)
A.8.1.1.1 Grammar
The grammar of the inputs section is as
follows:
A.8.1.1.2 Examples
This section provides a set of examples for the
single elements of a topology template.
Simple inputs example without
any constraints:
|
inputs:
fooName:
type: string
description: Simple string
typed property definition with no constraints.
default: bar
|
Example of inputs with
constraints:
|
inputs:
SiteName:
type: string
description: string typed
property definition with constraints
default: My Site
constraints:
- min_length: 9
|
A.8.1.2 node_templates
The node_templates
section lists the Node Templates that describe the (software) components that
are used to compose cloud applications.
A.8.1.2.1 grammar
The grammar of the node_templates section
is a follows:
A.8.1.2.2 Example
Example of node_templates section:
|
node_templates:
my_webapp_node_template:
type: WebApplication
my_database_node_template:
type: Database
|
A.8.1.3 relationship_templates
The relationship_templates
section lists the Relationship Templates that describe the relations between
components that are used to compose cloud applications.
Note that in the TOSCA Simple Profile, the explicit
definition of relationship templates as it was required in TOSCA v1.0 is
optional, since relationships between nodes get implicitly defined by
referencing other node templates in the requirements sections of node
templates.
A.8.1.3.1 Grammar
The grammar of the relationship_templates
section is as follows:
A.8.1.3.2 Example
Example of relationship_templates
section:
|
relationship_templates:
my_connectsto_relationship:
type:
tosca.relationships.ConnectsTo
interfaces:
Configure:
inputs:
speed: { get_attribute:
[ SOURCE, connect_speed ] }
|
A.8.1.4 outputs
The outputs section provides
a means to define the output parameters that are available from a TOSCA Simple
Profile service template. It allows for exposing attributes of node templates
or relationship templates within the containing topology_template to users of a service.
A.8.1.4.1 Grammar
The grammar of the outputs section is as
follows:
A.8.1.4.2 Example
Example of the outputs section:
|
outputs:
server_address:
description: The first private
IP address for the provisioned server.
value: { get_attribute: [ HOST,
networks, private, addresses, 0 ] }
|
A.8.1.5 groups
The groups section
allows for grouping one or more node templates within a TOSCA Service Template
and for assigning special attributes like policies to the group.
A.8.1.5.1 Grammar
The grammar of the groups section is as
follows:
|
groups:
<group_symbolic_name_1>:
members: [
node_template_name_1, ..., node_template_name_n ]
policies:
- <optional_list of
policy_names_for_group_1>
...
<group_symbolic_name_N>
members: [
node_template_name_1, ..., node_template_name_n ]
policies:
- <optional_list of
policy_names_for_group_N>
|
A.8.1.5.2 Example
The following example shows the definition of three
Compute nodes in the node_templates section of a topology_template
as well as the grouping of two of the Compute nodes in a group server_group_1.
|
node_templates:
server1:
type: tosca.nodes.Compute
# more details ...
server2:
type: tosca.nodes.Compute
# more details ...
server3:
type: tosca.nodes.Compute
# more details ...
groups:
server_group_1:
members: [ server1, server2 ]
policies:
- anti_collocation_policy:
# specific policy
declarations omitted, as this is not yet specified
|
A.8.2 Notes
·
The parameters (properties) that are listed as part of the inputs
block can be mapped to PropertyMappings provided as part of BoundaryDefinitions
as described by the TOSCA v1.0 specification.
·
The node templates listed as part of the node_templates
block can be mapped to the list of NodeTemplate
definitions provided as part of TopologyTemplate of a ServiceTemplate
as described by the TOSCA v1.0 specification.
·
The relationship templates listed as part of the relationship_templates
block can be mapped to the list of RelationshipTemplate
definitions provided as part of TopologyTemplate of a ServiceTemplate
as described by the TOSCA v1.0 specification.
·
The output parameters that are listed as part of the outputs
section of a topology template can be mapped to PropertyMappings
provided as part of BoundaryDefinitions as described by the
TOSCA v1.0 specification.
o Note, however,
that TOSCA v1.0 does not define a direction (input vs. output) for those
mappings, i.e. TOSCA v1.0 PropertyMappings are
underspecified in that respect and TOSCA Simple Profile’s inputs
and outputs provide a more concrete definition of input and output
parameters.
A.9 Service Template definition
A TOSCA Service Template (YAML)
document contains element definitions of building blocks for cloud application,
or complete models of cloud applications. This section describes the top-level
structural elements (TOSCA keynames) along with their grammars, which are
allowed to appear in a TOSCA Service Template document.
A.9.1 Keynames
The following is the list of recognized keynames for
a TOSCA Service Template definition:
|
Keyname
|
Required
|
Type
|
Description
|
|
tosca_definitions_version
|
yes
|
string
|
Defines the version of the TOSCA Simple Profile
specification the template (grammar) complies with.
|
|
tosca_default_namespace
|
no
|
string
|
Defines the namespace of the TOSCA schema to use for
validation.
|
|
metadata
|
no
|
map of string
|
Defines a section used to declare additional metadata
information. Domain-specific TOSCA profile specifications may define
keynames that are required for their implementations.
|
|
description
|
no
|
description
|
Declares a description for this Service Template and its
contents.
|
|
imports
|
no
|
list of
string
|
Declares import statements external TOSCA Definitions
documents. For example, these may be file location or URIs relative to the
service template file within the same TOSCA CSAR file.
|
|
dsl_defintions
|
no
|
N/A
|
Declares optional DSL-specific definitions and
conventions. For example, in YAML, this allows defining reusable YAML macros
(i.e., YAML alias anchors) for use throughout the TOSCA Service Template.
|
|
repositories
|
no
|
list of
Repository
definitions
|
Declares the list of external repositories which contain
artifacts that are referenced in the service template along with their
addresses and necessary credential information used to connect to them in
order to retrieve the artifacts.
|
|
data_types
|
no
|
list of
Data Types
|
Declares a list of optional TOSCA Data Type definitions.
|
|
node_types
|
no
|
list of
Node Types
|
This section contains a set of node type definitions for
use in service templates.
|
|
relationship_types
|
no
|
list of
Relationship
Types
|
This section contains a set of relationship type
definitions for use in service templates.
|
|
capability_types
|
no
|
list of
Capability Types
|
This section contains an optional list of capability type
definitions for use in service templates.
|
|
artifact_types
|
no
|
list of
Artifact Types
|
This section contains an optional list of artifact type
definitions for use in service templates
|
|
interface_types
|
no
|
list of
Interface Types
|
This section contains an optional list of interface type
definitions for use in service templates.
|
|
topology_template
|
no
|
Topology Template
|
Defines the topology template of an application or
service, consisting of node templates that represent the application’s or
service’s components, as well as relationship templates representing
relations between the components.
|
A.9.1.1 Metadata keynames
The following is the list of recognized metadata
keynames for a TOSCA Service Template definition:
|
Keyname
|
Required
|
Type
|
Description
|
|
template_name
|
no
|
string
|
Declares a descriptive name for the template.
|
|
template_author
|
no
|
string
|
Declares the author(s) or owner of the template.
|
|
template_version
|
no
|
string
|
Declares the version string for the template.
|
A.9.2 Grammar
The overall structure of a TOSCA
Service Template and its top-level key collations using the TOSCA Simple
Profile is shown below:
|
tosca_definitions_version: #
Required TOSCA Definitions version string
tosca_default_namespace: # Optional.
default namespace (for type schema)
# Optional metadata keyname: value
pairs
metadata:
template_name: #
Optional name of this service template
template_author: #
Optional author of this service template
template_version: #
Optional version of this service template
# Optional list of domain or
profile specific metadata keynames
# Optional description of the
definitions inside the file.
description: <template_type_description>
imports:
# list of import statements for
importing other definitions files
dsl_definitions:
# list of YAML alias anchors (or
macros)
repositories:
# list of external repository
definitions which host TOSCA artifacts
data_types:
# list of TOSCA datatype
definitions
node_types:
# list of node type definitions
capability_types:
# list of capability type
definitions
relationship_types:
# list of relationship type
definitions
artifact_types:
# list of artifact type
definitions
# list of interface type
definitions
topology_template:
# topology template definition
of the cloud application or service
|
A.9.2.1 Notes
·
TOSCA Service Templates do not have to contain a
topology_template and MAY contain simply type definitions (e.g., Artifact,
Interface, Capability, Node, Relationship Types, etc.) and be imported for use
as type definitions in other TOSCA Service Templates.
A.9.3 Top-level keyname definitions
A.9.3.1 tosca_definitions_version
This required element provides a means to include a
reference to the TOSCA Simple Profile specification within the TOSCA
Definitions YAML file. It is an indicator for the version of the TOSCA grammar
that should be used to parse the remainder of the document.
A.9.3.1.1 Keyname
|
tosca_definitions_version
|
A.9.3.1.2 Grammar
Single-line form:
|
tosca_definitions_version:
<tosca_simple_profile_version>
|
A.9.3.1.3 Examples:
TOSCA Simple Profile version 1.0 specification using
the defined namespace alias (see Section A.1):
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
|
TOSCA Simple Profile version 1.0 specification using
the fully defined (target) namespace (see Section A.1):
A.9.3.2
template_name
This optional element declares the optional name of service
template as a single-line string value.
A.9.3.2.1 Keyname
A.9.3.2.2 Grammar
|
template_name: <name string>
|
A.9.3.2.3 Example
|
template_name: My service template
|
A.9.3.2.4 Notes
·
Some service templates are designed to be referenced and reused
by other service templates. Therefore, in these cases, the template_name
value SHOULD be designed to be used as a unique identifier through the use of
namespacing techniques.
A.9.3.3 template_author
This optional element declares the optional author(s) of the
service template as a single-line string value.
A.9.3.3.1 Keyname
A.9.3.3.2 Grammar
|
template_author: <author
string>
|
A.9.3.3.3 Example
|
template_author: My service
template
|
A.9.3.4 template_version
This element declares the optional version of the service
template as a single-line string value.
A.9.3.4.1 Keyname
A.9.3.4.2 Grammar
A.9.3.4.3 Example
A.9.3.4.4 Notes:
·
Some service templates are designed to be referenced and reused
by other service templates and have a lifecycle of their own. Therefore, in
these cases, a template_version value SHOULD be included and
used in conjunction with a unique template_name value to
enable lifecycle management of the service template and its contents.
A.9.3.5
description
This optional element provides a means to include single or
multiline descriptions within a TOSCA Simple Profile template as a scalar
string value.
A.9.3.5.1 Keyname
A.9.3.6 imports
This optional element provides a way to import a block
sequence of one or more TOSCA Definitions documents. TOSCA Definitions
documents can contain reusable TOSCA type definitions (e.g., Node Types,
Relationship Types, Artifact Types, etc.) defined by other authors. This mechanism
provides an effective way for companies and organizations to define normative
types and/or describe their software applications for reuse in other TOSCA
Service Templates.
A.9.3.6.1 Keyname
A.9.3.6.2 Grammar
A.9.3.6.3 Example
|
# An example import of definitions
files from a location relative to the
# file location of the service
template declaring the import.
imports:
-
relative_path/my_defns/my_typesdefs_1.yaml
- ...
-
relative_path/my_defns/my_typesdefs_n.yaml
|
A.9.3.7 dsl_definitions
This optional element provides a section to define macros
(e.g., YAML-style macros when using the TOSCA Simple Profile in YAML
specification).
A.9.3.7.1 Keyname
A.9.3.7.2 Grammar
A.9.3.7.3 Example
|
dsl_definitions:
ubuntu_image_props:
&ubuntu_image_props
architecture: x86_64
type: linux
distribution: ubuntu
os_version: 14.04
redhat_image_props:
&redhat_image_props
architecture: x86_64
type: linux
distribution: rhel
os_version: 6.6
|
A.9.3.8 datatype_definitions
This optional element provides a section to define new
datatypes in TOSCA.
A.9.3.8.1 Keyname
A.9.3.8.2 Grammar
|
datatype_definitions:
<tosca_datatype_def_1>
...
<tosca_datatype_def_n>
|
A.9.3.8.3 Example
|
datatype_definitions:
# A complex datatype definition
simple_contactinfo_type:
properties:
name:
type: string
email:
type: string
phone:
type: string
# datatype definition derived
from an existing type
full_contact_info:
derived_from: simple_contact_info
properties:
street_address:
type: string
city:
type: string
state:
type: string
postalcode:
type: string
|
A.9.3.9 node_types
This element lists the Node Types that provide the reusable
type definitions for software components that Node Templates can be based upon.
A.9.3.9.1 Keyname
A.9.3.9.2 Grammar
A.9.3.9.3 Example
|
node_types:
my_webapp_node_type:
derived_from: WebApplication
properties:
my_port:
type: integer
my_database_node_type:
derived_from: Database
capabilities:
mytypes.myfeatures.transactSQL
|
A.9.3.9.4 Notes
·
The node types listed as part of the node_types
block can be mapped to the list of NodeType definitions as
described by the TOSCA v1.0 specification.
A.9.3.10 relationship_types
This element lists the Relationship Types that provide the
reusable type definitions that can be used to describe dependent relationships
between Node Templates or Node Types.
A.9.3.10.1 Keyname
A.9.3.10.2 Grammar
A.9.3.10.3 Example
|
relationship_types:
mycompany.mytypes.myCustomClientServerType:
derived_from: tosca.relationships.HostedOn
properties:
# more details ...
mycompany.mytypes.myCustomConnectionType:
derived_from: tosca.relationships.ConnectsTo
properties:
# more details ...
|
A.9.3.11
capability_types
This element lists the Capability Types that provide the
reusable type definitions that can be used to describe features Node Templates
or Node Types can declare they support.
A.9.3.11.1 Keyname
A.9.3.11.2 Grammar
A.9.3.11.3 Example
|
capability_types:
mycompany.mytypes.myCustomEndpoint:
derived_from:
tosca.capabilities.Endpoint
properties:
# more details ...
mycompany.mytypes.myCustomFeature:
derived_from:
tosca.capabilities.Feature
properties:
# more details ...
|
This section includes functions that are supported for use
within a TOSCA Service Template.
B.1 Reserved Function Keywords
The following keywords MAY be used in some TOSCA function in
place of a TOSCA Node or Relationship Template name. They will be interpreted
by a TOSCA orchestrator at the time the function would be evaluated at runtime
as described in the table below. Note that some keywords are only valid in the
context of a certain TOSCA entity as also denoted in the table.
|
Keyword
|
Valid Contexts
|
Description
|
|
SELF
|
Node Template or Relationship Template
|
A TOSCA orchestrator will interpret this keyword as the
Node or Relationship Template instance that contains the function at the time
the function is evaluated.
|
|
SOURCE
|
Relationship Template only.
|
A TOSCA orchestrator will interpret this keyword as the
Node Template instance that is at the source end of the relationship that
contains the referencing function.
|
|
TARGET
|
Relationship Template only.
|
A TOSCA orchestrator will interpret this keyword as the
Node Template instance that is at the target end of the relationship that
contains the referencing function.
|
|
HOST
|
Node Template only
|
A TOSCA orchestrator will interpret this keyword to refer
to the all nodes that “host” the node using this reference (i.e., as
identified by its HostedOn relationship).
Specifically, TOSCA orchestrators that encounter this
keyword when evaluating the get_attribute or get_property functions
SHALL search each node along the “HostedOn” relationship chain starting at
the immediate node that hosts the node where the function was evaluated (and
then that node’s host node, and so forth) until a match is found or the
“HostedOn” relationship chain ends.
|
B.2
Environment Variable Conventions
B.2.1 Reserved Environment Variable Names and Usage
TOSCA orchestrators utilize certain reserved keywords in the
execution environments that implementation artifacts for Node or Relationship
Templates operations are executed in. They are used to provide information to
these implementation artifacts such as the results of TOSCA function evaluation
or information about the instance model of the TOSCA application
The following keywords are reserved environment variable
names in any TOSCA supported execution environment:
|
Keyword
|
Valid Contexts
|
Description
|
|
TARGETS
|
Relationship Template only.
|
·
For an implementation artifact
that is executed in the context of a relationship, this keyword, if present,
is used to supply a list of Node Template instances in a TOSCA application’s
instance model that are currently target of the context relationship.
·
The value of this environment
variable will be a comma-separated list of identifiers of the single target
node instances (i.e., the tosca_id attribute of the node).
|
|
TARGET
|
Relationship Template only.
|
·
For an implementation artifact
that is executed in the context of a relationship, this keyword, if present,
identifies a Node Template instance in a TOSCA application’s instance model
that is a target of the context relationship, and which is being acted upon
in the current operation.
·
The value of this environment
variable will be the identifier of the single target node instance (i.e., the
tosca_id attribute of
the node).
|
|
SOURCES
|
Relationship Template only.
|
·
For an implementation artifact
that is executed in the context of a relationship, this keyword, if present,
is used to supply a list of Node Template instances in a TOSCA application’s
instance model that are currently source of the context relationship.
·
The value of this environment
variable will be a comma-separated list of identifiers of the single source
node instances (i.e., the tosca_id attribute of the node).
|
|
SOURCE
|
Relationship Template only.
|
·
For an implementation artifact
that is executed in the context of a relationship, this keyword, if present,
identifies a Node Template instance in a TOSCA application’s instance model
that is a source of the context relationship, and which is being acted upon
in the current operation.
·
The value of this environment
variable will be the identifier of the single source node instance (i.e., the
tosca_id attribute of
the node).
|
For scripts (or implementation artifacts in general) that
run in the context of relationship operations, select properties and attributes
of both the relationship itself as well as select properties and attributes of
the source and target node(s) of the relationship can be provided to the
environment by declaring respective operation inputs.
Declared inputs from mapped properties or attributes of the
source or target node (selected via the SOURCE
or TARGET keyword) will be provided to
the environment as variables having the exact same name as the inputs. In
addition, the same values will be provided for the complete set of source or
target nodes, however prefixed with the ID if the respective nodes. By means of
the SOURCES or TARGETS variables holding the complete set of
source or target node IDs, scripts will be able to iterate over corresponding
inputs for each provided ID prefix.
The following example snippet shows an imaginary
relationship definition from a load-balancer node to worker nodes. A script is
defined for the add_target operation of
the Configure interface of the relationship, and the ip_address attribute of the target is
specified as input to the script:
|
node_templates:
load_balancer:
type: some.vendor.LoadBalancer
requirements:
- member:
relationship:
some.vendor.LoadBalancerToMember
interfaces:
Configure:
add_target:
inputs:
member_ip: {
get_attribute: [ TARGET, ip_address ] }
implementation:
scripts/configure_members.py
|
The add_target operation
will be invoked, whenever a new target member is being added to the
load-balancer. With the above inputs declaration, a member_ip
environment variable that will hold the IP address of the target being added
will be provided to the configure_members.py
script. In addition, the IP addresses of all current load-balancer members will
be provided as environment variables with a naming scheme of <target
node ID>_member_ip. This will allow, for example, scripts that
always just write the complete list of load-balancer members into a
configuration file to do so instead of updating existing list, which might be
more complicated.
Assuming that the TOSCA application instance
includes five load-balancer members, node1 through node5,
where node5 is the current target being added, the
following environment variables (plus potentially more variables) would be
provided to the script:
|
# the ID of the current target and
the IDs of all targets
TARGET=node5
TARGETS=node1,node2,node3,node4,node5
# the input for the current target
and the inputs of all targets
member_ip=10.0.0.5
node1_member_ip=10.0.0.1
node2_member_ip=10.0.0.2
node3_member_ip=10.0.0.3
node4_member_ip=10.0.0.4
node5_member_ip=10.0.0.5
|
With code like shown in the snippet below, scripts
could then iterate of all provided member_ip inputs:
|
#!/usr/bin/python
import os
targets =
os.environ['TARGETS'].split(',')
for t in targets:
target_ip =
os.environ.get('%s_member_ip' % t)
# do something with target_ip
...
|
B.2.2 Prefixed vs. Unprefixed TARGET names
The list target node types assigned to the TARGETS key in an
execution environment would have names prefixed by unique IDs that distinguish different
instances of a node in a running model Future drafts of this specification
will show examples of how these names/IDs will be expressed.
B.2.2.1 Notes
·
Target of interest is always un-prefixed. Prefix is the target
opaque ID. The IDs can be used to find the environment var. for the
corresponding target. Need an example here.
·
If you have one node that contains multiple targets this would
also be used (add or remove target operations would also use this you would get
set of all current targets).
B.3
Intrinsic functions
These functions are supported within the TOSCA template for
manipulation of template data.
B.3.1 concat
The concat function
is used to concatenate two or more string values within a TOSCA service
template.
B.3.1.1 Grammar
|
concat:
[<string_value_expressions_*> ]
|
B.3.1.2 Parameters
|
Parameter
|
Required
|
Type
|
Description
|
|
<string_value_expressions_*>
|
yes
|
list of
string or
string value expressions
|
A list of one or more strings (or expressions that result
in a string value) which can be concatenated together into a single string.
|
B.3.1.3 Examples
|
outputs:
description: Concatenate the URL
for a server from other template values
server_url:
value: { concat: [
'http://',
get_attribute:
[ server, public_address ],
':' ,
get_attribute: [ server, port ] ] }
|
B.3.1 token
The token function
is used within a TOSCA service template on a string to parse out (tokenize)
substrings separated by one or more token characters within a larger string.
B.3.1.1 Grammar
|
token: [
<string_with_tokens>, <string_of_token_chars>,
<substring_index> ]
|
B.3.1.2 Parameters
|
Parameter
|
Required
|
Type
|
Description
|
|
string_with_tokens
|
yes
|
string
|
The composite string that contains one or more substrings
separated by token characters.
|
|
string_of_token_chars
|
yes
|
string
|
The string that contains one or more token characters that
separate substrings within the composite string.
|
|
substring_index
|
yes
|
integer
|
The integer indicates the index of the substring to return
from the composite string. Note that the first substring is denoted by using
the ‘0’ (zero) integer value.
|
B.3.1.3 Examples
|
outputs:
webserver_port:
description: the port
provided at the end of my server’s endpoint’s IP address
value: { token: [
get_attribute: [ my_server, data_endpoint, ip_address ],
‘:’,
1 ] }
|
B.4 Property functions
These functions are used within a service template to obtain
property values from property definitions declared elsewhere in the same
service template. These property definitions can appear either directly in the
service template itself (e.g., in the inputs section) or on entities (e.g.,
node or relationship templates) that have been modeled within the template.
Note that the get_input
and get_property functions may only
retrieve the static values of property definitions of a TOSCA application as
defined in the TOSCA Service Template. The get_attribute
function should be used to retrieve values for attribute definitions (or
property definitions reflected as attribute definitions) from the runtime
instance model of the TOSCA application (as realized by the TOSCA
orchestrator).
B.4.1 get_input
The get_input function
is used to retrieve the values of properties declared within the inputs section of a TOSCA Service Template.
B.4.1.1 Grammar
|
get_input:
<input_property_name>
|
B.4.1.2 Parameters
|
Parameter
|
Required
|
Type
|
Description
|
|
<input_property_name>
|
yes
|
string
|
The name of the property as defined in the inputs section of the service template.
|
B.4.1.3 Examples
|
inputs:
cpus:
type: integer
node_templates:
my_server:
type: tosca.nodes.Compute
capabilities:
host:
properties:
num_cpus: { get_input: cpus }
|
B.4.2 get_property
The get_property function
is used to retrieve property values between modelable entities defined in the
same service template.
B.4.2.1 Grammar
|
get_property: [ <modelable_entity_name>,
<optional_req_or_cap_name>, <property_name>,
<nested_property_name_or_index_1>, ..., <nested_property_name_or_index_n>
]
|
B.4.2.2 Parameters
|
Parameter
|
Required
|
Type
|
Description
|
|
<modelable
entity name> | SELF | SOURCE | TARGET | HOST
|
yes
|
string
|
The required name of a modelable entity (e.g., Node
Template or Relationship Template name) as declared in the service template
that contains the named property definition the function will return the
value from. See section B.1 for valid keywords.
|
|
<optional_req_or_cap_name>
|
no
|
string
|
The optional name of the requirement or capability name
within the modelable entity (i.e., the <modelable_entity_name> which
contains the named property definition the function will return the value
from.
Note: If the property definition is located in the
modelable entity directly, then this parameter MAY be omitted.
|
|
<property_name>
|
yes
|
string
|
The name of the property definition the function will
return the value from.
|
|
<nested_property_name_or_index_*>
|
no
|
string| integer
|
Some TOSCA properties are complex (i.e., composed as
nested structures). These parameters are used to dereference into the names
of these nested structures when needed.
Some properties represent list types. In these cases, an index may be
provided to reference a specific entry in the list (as named in the previous
parameter) to return.
|
B.4.2.3 Examples
The following example shows how to use the
get_property function with an actual Node Template name:
|
node_templates:
mysql_database:
type: tosca.nodes.Database
properties:
name: sql_database1
wordpress:
type:
tosca.nodes.WebApplication.WordPress
...
interfaces:
Standard:
configure:
inputs:
wp_db_name: { get_property: [
mysql_database, name ] }
|
The following example shows
how to use the get_property function using the SELF keyword:
|
node_templates:
mysql_database:
type: tosca.nodes.Database
...
capabilities:
database_endpoint:
properties:
port: 3306
wordpress:
type:
tosca.nodes.WebApplication.WordPress
requirements:
...
- database_endpoint:
mysql_database
interfaces:
Standard:
create: wordpress_install.sh
configure:
implementation:
wordpress_configure.sh
inputs:
...
wp_db_port: { get_property: [ SELF,
database_endpoint, port ] }
|
The following example shows how to use the get_property
function using the TARGET keyword:
B.5
Attribute functions
These functions (attribute functions) are used within an
instance model to obtain attribute values from instances of nodes and
relationships that have been created from an application model described in a
service template. The instances of nodes or relationships can be referenced by
their name as assigned in the service template or relative to the context where
they are being invoked.
B.5.1 get_attribute
The get_attribute
function is used to retrieve the values of named attributes declared by the
referenced node or relationship template name.
B.5.1.1 Grammar
|
get_attribute: [ <modelable_entity_name>,
<optional_req_or_cap_name>, <attribute_name>,
<nested_attribute_name_or_index_1>, ..., <nested_attribute_name_or_index_n>,
]
|
B.5.1.2 Parameters
|
Parameter
|
Required
|
Type
|
Description
|
|
<modelable
entity name> | SELF | SOURCE | TARGET | HOST
|
yes
|
string
|
The required name of a modelable entity (e.g., Node
Template or Relationship Template name) as declared in the service template
that contains the named attribute definition the function will return the
value from. See section B.1 for valid keywords.
|
|
<optional_req_or_cap_name>
|
no
|
string
|
The optional name of the requirement or capability name
within the modelable entity (i.e., the <modelable_entity_name> which
contains the named attribute definition the function will return the value
from.
Note: If the attribute definition is located in
the modelable entity directly, then this parameter MAY be omitted.
|
|
<attribute_name>
|
yes
|
string
|
The name of the attribute definition the function will
return the value from.
|
|
<nested_attribute_name_or_index_*>
|
no
|
string| integer
|
Some TOSCA attributes are complex (i.e., composed as
nested structures). These parameters are used to dereference into the names
of these nested structures when needed.
Some attributes represent list
types. In these cases, an index may be provided to reference a specific entry
in the list (as named in the previous parameter) to return.
|
B.5.1.3 Examples:
The attribute functions are used in the same way as the
equivalent Property functions described above. Please see their examples and
replace “get_property” with “get_attribute” function name.
B.5.1.4 Notes
These functions are used to obtain attributes from instances
of node or relationship templates by the names they were given within the
service template that described the application model (pattern).
B.5.1.4.1 Notes:
- These functions only work when the orchestrator
can resolve to a single node or relationship instance for the named node
or relationship. This essentially means this is acknowledged to work only
when the node or relationship template being referenced from the service
template has a cardinality of 1 (i.e., there can only be one instance of
it running).
B.6 Operation functions
These functions are used within an instance model to obtain values
from interface operations. These can be used in order to set an attribute of a
node instance at runtime or to pass values from one operation to another.
B.6.1 get_operation_output
The get_operation_output
function is used to retrieve the values of variables exposed / exported from an
interface operation.
B.6.1.1 Grammar
|
get_operation_output: <modelable_entity_name>,
<interface_name>, <operation_name>, <output_variable_name>
|
B.6.1.2 Parameters
|
Parameter
|
Required
|
Type
|
Description
|
|
<modelable
entity name> | SELF | SOURCE | TARGET
|
yes
|
string
|
The required name of a modelable entity (e.g., Node
Template or Relationship Template name) as declared in the service template
that implements the named interface and operation.
|
|
<interface_name>
|
Yes
|
string
|
The required name of the interface which defines the
operation.
|
|
<operation_name>
|
yes
|
string
|
The required name of the operation whose value we would
like to retrieve.
|
|
<output_variable_name>
|
Yes
|
string
|
The required name of the variable that is exposed /
exported by the operation.
|
B.6.1.3 Notes
·
If operation failed, then ignore its outputs. Orchestrators
should allow orchestrators to continue running when possible past deployment in
the lifecycle. For example, if an update fails, the application should be
allowed to continue running and some other method would be used to alert
administrators of the failure.
B.7
Navigation functions
·
This version of the TOSCA Simple Profile does not define any
model navigation functions.
B.7.1 get_nodes_of_type
The get_nodes_of_type
function can be used to retrieve a list of all known instances of nodes of the declared
Node Type.
B.7.1.1 Grammar
|
get_nodes_of_type: <node_type_name>
|
B.7.1.2 Parameters
|
Parameter
|
Required
|
Type
|
Description
|
|
<node_type_name>
|
yes
|
string
|
The required name of a Node Type that a TOSCA orchestrator
would use to search a running application instance in order to return all
unique, named node instances of that type.
|
B.7.1.3 Returns
B.7.1.4
|
Return Key
|
Type
|
Description
|
|
TARGETS
|
<see above>
|
The list of node instances from the current application
instance that match the node_type_name supplied as an input
parameter of this function.
|
B.8
Artifact functions
B.8.1 get_artifact
The get_artifact function
is used to retrieve artifact location between modelable entities defined in the
same service template.
B.8.1.1 Grammar
|
get_artifact: [
<modelable_entity_name>, <artifact_name>, <location>,
<remove> ]
|
B.8.1.2 Parameters
|
Parameter
|
Required
|
Type
|
Description
|
|
<modelable entity name> | SELF | SOURCE | TARGET |
HOST
|
yes
|
string
|
The required name of a modelable
entity (e.g., Node Template or Relationship Template name) as declared in the
service template that contains the named property definition the function
will return the value from. See section B.1 for valid keywords.
|
|
<artifact_name>
|
yes
|
string
|
The name of the artifact
definition the function will return the value from.
|
|
<location> | LOCAL_FILE
|
no
|
string
|
Location value must be either a
valid path e.g. ‘/etc/var/my_file’ or ‘LOCAL_FILE’.
If the value is LOCAL_FILE the
orchestrator is responsible for providing a path as the result of the get_artifact call
where the artifact file can be accessed. The orchestrator will also remove
the artifact from this location at the end of the operation.
If the location is a path
specified by the user the orchestrator is responsible to copy the artifact to
the specified location. The orchestrator will return the path as the value of
the get_artifact function
and leave the file here after the execution of the operation.
|
|
remove
|
no
|
boolean
|
Boolean flag to override the
orchestrator default behavior so it will remove or not the artifact at the
end of the operation execution.
If not specified the removal
will depends of the location e.g. removes it in case of ‘LOCAL_FILE’ and keeps it in case of a path.
If true the artifact will be
removed by the orchestrator at the end of the operation execution, if false
it will not be removed.
|
B.8.1.3 Examples
The following example shows how to use the get_artifact function with an actual Node
Template name:
B.8.1.3.1 Example: Retrieving artifact without
specified location:
|
node_templates:
wordpress:
type:
tosca.nodes.WebApplication.WordPress
...
interfaces:
Standard:
configure:
create:
implementation:
wordpress_install.sh
inputs
wp_zip: { get_artifact: [
SELF, zip ] }
artifacts:
zip: /data/wordpress.zip
|
In such implementation the tosca orchestrator may provide
the wordpress.zip archive as a local url (example: file://home/user/wordpress.zip) or
a remote one (example: http://cloudrepo:80/files/wordpress.zip)
(some orchestrator may indeed provide some global artifact repository
management features)
B.8.1.3.2 Example: Retrieving artifact as a local
path :
The following example explains how to force the orchestrator
to copy the fille locally before calling the operation’s implementation script:
|
node_templates:
wordpress:
type:
tosca.nodes.WebApplication.WordPress
...
interfaces:
Standard:
configure:
create:
implementation:
wordpress_install.sh
inputs
wp_zip: { get_artifact: [
SELF, zip, LOCAL_FILE] }
artifacts:
zip: /data/wordpress.zip
|
In such implementation the tosca orchestrator must
provide the wordpress.zip archive as a local path (example: /tmp/wordpress.zip) and will
remove it after the operation is completed.
B.8.1.3.3 Example: Retrieving artifact in a
specified location:
The following example explains how to force the orchestrator
to copy the fille locally to a specific location before calling the operation’s
implementation script :
|
node_templates:
wordpress:
type:
tosca.nodes.WebApplication.WordPress
...
interfaces:
Standard:
configure:
create:
implementation:
wordpress_install.sh
inputs
wp_zip: { get_artifact: [
SELF, zip, C:/wpdata/wp.zip ] }
artifacts:
zip: /data/wordpress.zip
|
In such implementation the tosca orchestrator must
provide the wordpress.zip archive as a local path (example: C:/wpdata/wp.zip
) and will let it after the operation is completed.
B.9 Context-based Entity name
(global)
TBD
Goal:
·
Using the full paths of modelable entity names to qualify context
with the future goal of a more robust get_attribute function: e.g., get_attribute(
<context-based-entity-name>, <attribute name>)
The declarative approach is heavily
dependent of the definition of basic types that a declarative container must
understand. The definition of these types must be very clear such that the
operational semantics can be precisely followed by a declarative container to
achieve the effects intended by the modeler of a topology in an interoperable
manner.
C.1 Assumptions
·
Assumes alignment with/dependence on XML normative types proposal
for TOSCA v1.1
·
Assumes that the normative types will be versioned and the TOSCA
TC will preserve backwards compatibility.
·
Assumes that security and access control will be addressed in
future revisions or versions of this specification.
C.2 Data Types
C.2.1
tosca.datatypes.Credential
The Credential type is a complex TOSCA data Type
used when describing authorization credentials used to access network
accessible resources.
|
Shorthand Name
|
Credential
|
|
Type Qualified Name
|
tosca:Credential
|
|
Type URI
|
tosca.datatypes.Credential
|
C.2.1.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
protocol
|
yes
|
string
|
None
|
The required protocol name.
|
|
token_type
|
yes
|
string
|
default: password
|
The required token type.
|
|
token
|
yes
|
string
|
None
|
The required token used as a credential for authorization
or access to a networked resource.
|
|
keys
|
no
|
map of string
|
None
|
The optional list of protocol-specific keys or assertions.
|
|
user
|
no
|
string
|
None
|
The optional user (name or ID) used for non-token based
credentials.
|
C.2.1.2 Definition
The TOSCA Credential type is defined as follows:
|
tosca.datatypes.Credential:
properties:
protocol:
type: string
required: false
token_type:
type: string
default: password
token:
type: string
keys:
type: map
required: false
entry_schema:
type: string
user:
type: string
required: false
|
C.2.1.3 Additional requirements
·
TOSCA Orchestrators SHALL interpret and validate the value of the
token property based upon the value of the token_type
property.
C.2.1.4 Notes
·
Specific token types and encoding them using network protocols
are not defined or covered in this specification.
·
The use of transparent user names (IDs) or passwords are not
considered best practice.
C.2.1.5 Examples
C.2.1.5.1 Provide a simple user name and password
without a protocol or standardized token format
|
<some_tosca_entity>:
properties:
my_credential:
type: Credential
properties:
user: myusername
token: mypassword
|
C.2.1.5.2 HTTP Basic access authentication
credential
|
<some_tosca_entity>:
properties:
my_credential:
type: Credential
properties:
protocol: http
token_type: basic_auth
# Username and password
are combined into a string
# Note: this would be
base64 encoded before transmission by any impl.
token: myusername:mypassword
|
C.2.1.5.3 X-Auth-Token credential
|
<some_tosca_entity>:
properties:
my_credential:
type: Credential
properties:
protocol: xauth
token_type: X-Auth-Token
# token encoded in
Base64
token: 604bbe45ac7143a79e14f3158df67091
|
C.2.1.5.4 OAuth bearer token credential
|
<some_tosca_entity>:
properties:
my_credential:
type: Credential
properties:
protocol: oauth2
token_type: bearer
# token encoded in
Base64
token: 8ao9nE2DEjr1zCsicWMpBC |
C.2.2 tosca.datatypes.network.NetworkInfo
The Network type is a complex TOSCA data type used
to describe logical network information.
|
Shorthand Name
|
NetworkInfo
|
|
Type Qualified Name
|
tosca:NetworkInfo
|
|
Type URI
|
tosca.datatypes.network.NetworkInfo
|
C.2.2.1 Properties
|
Name
|
Type
|
Constraints
|
Description
|
|
network_name
|
string
|
None
|
The name of the logical network.
e.g., “public”, “private”, “admin”. etc.
|
|
network_id
|
string
|
None
|
The unique ID of for the network generated by the network
provider.
|
|
addresses
|
string []
|
None
|
The list of IP addresses assigned from the underlying
network.
|
C.2.2.2 Definition
The TOSCA NetworkInfo data type is defined as follows:
|
tosca.datatypes.network.NetworkInfo:
properties:
network_name:
type: string
network_id:
type: string
addresses:
type: list
entry_schema:
type: string
|
C.2.2.3 Examples
Example usage of the NetworkInfo data type:
|
private_network:
network_name: private
network_id: 3e54214f-5c09-1bc9-9999-44100326da1b
addresses: [ 10.111.128.10 ]
|
C.2.2.4 Additional
Requirements
·
It is expected that TOSCA orchestrators MUST be able to map the network_name
from the TOSCA model to underlying network model of the provider.
·
The properties (or attributes) of NetworkInfo may or may not be
required depending on usage context.
C.2.3 tosca.datatypes.network.PortInfo
The PortInfo type is a complex TOSCA data type used
to describe network port information.
|
Shorthand Name
|
PortInfo
|
|
Type Qualified Name
|
tosca:PortInfo
|
|
Type URI
|
tosca.datatypes.network.PortInfo
|
C.2.3.1 Properties
|
Name
|
Type
|
Constraints
|
Description
|
|
port_name
|
string
|
None
|
The logical network port name.
|
|
port_id
|
string
|
None
|
The unique ID for the network port generated by the network
provider.
|
|
network_id
|
string
|
None
|
The unique ID for the network.
|
|
mac_address
|
string
|
None
|
The unique media access control address (MAC address)
assigned to the port.
|
|
addresses
|
string []
|
None
|
The list of IP address(es) assigned to the port.
|
C.2.3.2 Definition
The TOSCA Port type is defined as follows:
|
tosca.datatypes.network.PortInfo:
properties:
port_name:
type: string
port_id:
type: string
network_id:
type: string
mac_address:
type: string
addresses:
type: list
entry_schema:
type: string
|
C.2.3.3 Examples
Example usage of the PortInfo data type:
|
ethernet_port:
port_name: port1
port_id: 2c0c7a37-691a-23a6-7709-2d10ad041467
network_id: 3e54214f-5c09-1bc9-9999-44100326da1b
mac_address: f1:18:3b:41:92:1e
addresses: [ 172.24.9.102 ]
|
C.2.3.4 Additional Requirements
·
It is expected that TOSCA orchestrators MUST be able to map the port_name
from the TOSCA model to underlying network model of the provider.
·
The properties (or attributes) of PortInfo may or may not be
required depending on usage context.
C.2.4 tosca.datatypes.network.PortDef
The PortDef type is a TOSCA data Type used to define
a network port.
|
Shorthand Name
|
PortDef
|
|
Type Qualified Name
|
tosca:PortDef
|
|
Type URI
|
tosca.datatypes.network.PortDef
|
C.2.4.1 Definition
The TOSCA PortDef type is defined as follows:
|
tosca.datatypes.network.PortDef:
derived_from: integer
constraints:
- in_range: [ 1, 65535 ]
|
C.2.4.2 Examples
Example use of a PortDef property type:
|
listen_port:
type: PortDef
default: 9000
constraints:
- in_range [ 9000, 9090 ]
|
C.2.5 tosca.datatypes.network.PortSpec
The PortSpec type is a complex TOSCA data Type used
when describing port specifications for a network connection.
|
Shorthand Name
|
PortSpec
|
|
Type Qualified Name
|
tosca:PortSpec
|
|
Type URI
|
tosca.datatypes.network.PortSpec
|
C.2.5.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
protocol
|
yes
|
string
|
default: tcp
|
The required protocol used on the port.
|
|
source
|
no
|
PortDef
|
See PortDef
|
The optional source port.
|
|
source_range
|
no
|
range
|
in_range: [ 1, 65536 ]
|
The optional range for source port.
|
|
target
|
no
|
PortDef
|
See PortDef
|
The optional target port.
|
|
target_range
|
no
|
range
|
in_range: [ 1, 65536 ]
|
The optional range for target port.
|
C.2.5.2 Definition
The TOSCA PortSpec type is defined as follows:
|
tosca.datatypes.network.PortSpec:
properties:
protocol:
type: string
required: true
default: tcp
constraints:
- valid_values: [ udp,
tcp, igmp ]
target:
type: integer
entry_schema:
type: PortDef
target_range:
type: range
constraints:
- in_range: [ 1, 65535 ]
source:
type: integer
entry_schema:
type: PortDef
source_range:
type: range
constraints:
- in_range: [ 1, 65535 ]
|
C.2.5.3 Additional requirements
·
A valid PortSpec must have at least one of the following
properties: target, target_range, source or source_range.
C.2.5.4 Examples
Example usage of the PortSpec data type:
|
# example properties in a node template
some_endpoint:
properties:
ports:
user_port:
protocol: tcp
target: 50000
target_range: [ 20000,
60000 ]
source: 9000
source_range: [ 1000,
10000 ]
|
C.3 Capabilities Types
C.3.1 tosca.capabilities.Root
This is the default (root) TOSCA Capability Type definition
that all other TOSCA Capability Types derive from.
C.3.1.1 Definition
|
tosca.capabilities.Root:
description: The TOSCA root Capability
Type all other TOSCA base Capability Types derive from
|
C.3.2 tosca.capabilities.Node
The Node capability indicates the base capabilities
of a TOSCA Node Type.
|
Shorthand Name
|
Node
|
|
Type Qualified Name
|
tosca:Node
|
|
Type URI
|
tosca.capabilities.Node
|
C.3.2.1 Definition
C.3.3 tosca.capabilities.Container
The Container capability, when included on a Node
Type or Template definition, indicates that the node can act as a container for
(or a host for) one or more other declared Node Types.
|
Shorthand Name
|
Container
|
|
Type Qualified Name
|
tosca:Container
|
|
Type URI
|
tosca.capabilities.Container
|
C.3.3.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
num_cpus
|
no
|
integer
|
greater_or_equal: 1
|
Number of (actual or virtual) CPUs associated with the
Compute node.
|
|
cpu_frequency
|
no
|
scalar-unit.frequency
|
greater_or_equal: 0.1 GHz
|
Specifies the operating frequency of CPU's core. This
property expresses the expected frequency of one (1) CPU as provided by the
property “num_cpus”.
|
|
disk_size
|
no
|
scalar-unit.size
|
greater_or_equal: 0 MB
|
Size of the local disk available to applications running
on the Compute node (default unit is MB).
|
|
mem_size
|
no
|
scalar-unit.size
|
greater_or_equal: 0 MB
|
Size of memory available to applications running on the
Compute node (default unit is MB).
|
C.3.3.2 Definition
|
tosca.capabilities.Container:
derived_from: tosca.capabilities.Root
properties:
num_cpus:
type: integer
required: false
constraints:
- greater_or_equal: 1
cpu_frequency:
type: scalar-unit.frequency
required: false
constraints:
- greater_or_equal: 0.1
GHz
disk_size:
type: scalar-unit.size
required: false
constraints:
- greater_or_equal: 0 MB
mem_size:
type: scalar-unit.size
required: false
constraints:
- greater_or_equal: 0 MB
|
C.3.4 tosca.capabilities.Endpoint
This is the default
TOSCA type that should be used or extended to define a network endpoint
capability. This includes the information to express a basic endpoint with a
single port or a complex endpoint with multiple ports. By default the Endpoint
is assumed to represent an address on a private network unless otherwise
specified.
|
Shorthand Name
|
Endpoint
|
|
Type Qualified Name
|
tosca:Endpoint
|
|
Type URI
|
tosca.capabilities.Endpoint
|
C.3.4.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
protocol
|
yes
|
string
|
default: tcp
|
The name of the protocol (i.e., the protocol prefix) that
the endpoint accepts (any OSI Layer 4-7 protocols)
Examples: http, https, ftp, tcp, udp, etc.
|
|
port
|
no
|
PortDef
|
greater_or_equal: 1
less_or_equal: 65535
|
The optional port of the endpoint.
|
|
secure
|
no
|
boolean
|
default: false
|
Requests for the endpoint to be secure and use credentials
supplied on the ConnectsTo relationship.
|
|
url_path
|
no
|
string
|
None
|
The optional URL path of the endpoint’s address if
applicable for the protocol.
|
|
port_name
|
no
|
string
|
None
|
The optional name (or ID) of the network port this
endpoint should be bound to.
|
|
network_name
|
no
|
string
|
default: PRIVATE
|
The optional name (or ID) of the network this endpoint
should be bound to.
network_name: PRIVATE | PUBLIC |<network_name> |
<network_id>
|
|
initiator
|
no
|
string
|
one of:
·
source
·
target
·
peer
default: source
|
The optional indicator of the direction of the connection.
|
|
ports
|
no
|
map of PortSpec
|
None
|
The optional map of ports the Endpoint supports (if more
than one)
|
C.3.4.2 Attributes
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
ip_address
|
yes
|
string
|
None
|
Note: This is the IP address as propagated up by the
associated node’s host (Compute) container.
|
C.3.4.3 Definition
|
tosca.capabilities.Endpoint:
derived_from: tosca.capabilities.Root
properties:
protocol:
type: string
default: tcp
port:
type: PortDef
required: false
secure:
type: boolean
default: false
url_path:
type: string
required: false
port_name:
type: string
required: false
network_name:
type: string
required: false
default: PRIVATE
initiator:
type: string
default: source
constraints:
- valid_values: [ source,
target, peer ]
ports:
type: map
required: false
constraints:
- min_length: 1
entry_schema:
type: PortSpec
attributes:
ip_address:
type: string
|
C.3.4.4 Additional requirements
·
Although both the port and ports properties are not required, one
of port or ports must be provided in a valid Endpoint.
C.3.5 tosca.capabilities.Endpoint.Public
This capability represents a public endpoint which
is accessible to the general internet (and its public IP address ranges).
This public endpoint capability also can be used to
create a floating (IP) address that the underlying network assigns from a pool
allocated from the application’s underlying public network. This floating
address is managed by the underlying network such that can be routed an
application’s private address and remains reliable to internet clients.
|
Shorthand Name
|
Endpoint.Public
|
|
Type Qualified Name
|
tosca:Endpoint.Public
|
|
Type URI
|
tosca.capabilities.Endpoint.Public
|
C.3.5.1 Definition
|
tosca.capabilities.Endpoint.Public:
derived_from: tosca.capabilities.Endpoint
properties:
# Change the default network_name
to use the first public network found
network_name: PUBLIC
floating:
description: >
indicates that the public
address should be allocated from a pool of floating IPs that are associated
with the network.
type: boolean
default: false
status: experimental
dns_name:
description: The optional
name to register with DNS
type: string
required: false
status: experimental
|
C.3.5.2 Additional requirements
·
If the network_name is set to the reserved
value PRIVATE or if the value is set to the name of
network (or subnetwork) that is not public (i.e., has non-public IP address
ranges assigned to it) then TOSCA Orchestrators SHALL treat this as an
error.
·
If a dns_name is set, TOSCA Orchestrators
SHALL attempt to register the name in the (local) DNS registry for the Cloud
provider.
C.3.6 tosca.capabilities.Endpoint.Admin
This is the default TOSCA type that should be used
or extended to define a specialized administrator endpoint capability.
|
Shorthand Name
|
Endpoint.Admin
|
|
Type Qualified Name
|
tosca:Endpoint.Admin
|
|
Type URI
|
tosca.capabilities.Endpoint.Admin
|
C.3.6.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
None
|
N/A
|
N/A
|
N/A
|
N/A
|
C.3.6.2 Definition
|
tosca.capabilities.Endpoint.Admin:
derived_from: tosca.capabilities.Endpoint
# Change Endpoint secure
indicator to true from its default of false
properties:
secure: true
|
C.3.6.3 Additional requirements
·
TOSCA Orchestrator implementations of Endpoint.Admin (and
connections to it) SHALL assure that network-level security is enforced
if possible.
C.3.7 tosca.capabilities.Endpoint.Database
This is the default TOSCA type that should be used
or extended to define a specialized database endpoint capability.
|
Shorthand Name
|
Endpoint.Database
|
|
Type Qualified Name
|
tosca:Endpoint.Database
|
|
Type URI
|
tosca.capabilities.Endpoint.Database
|
C.3.7.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
None
|
N/A
|
N/A
|
N/A
|
N/A
|
C.3.7.2 Definition
C.3.8 tosca.capabilities.Attachment
This is the default TOSCA type that should be used
or extended to define an attachment capability of a (logical) infrastructure
device node (e.g., BlockStorage
node).
|
Shorthand Name
|
Attachment
|
|
Type Qualified Name
|
tosca:Attachment
|
|
Type URI
|
tosca.capabilities.Attachment
|
C.3.8.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
C.3.8.2 Definition
C.3.9 tosca.capabilities.OperatingSystem
This is the default TOSCA type that should be used
to express an Operating System capability for a node.
|
Shorthand Name
|
OperatingSystem
|
|
Type Qualified Name
|
tosca:OperatingSystem
|
|
Type URI
|
tosca.capabilities.OperatingSystem
|
C.3.9.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
architecture
|
no
|
string
|
None
|
The Operating System (OS) architecture.
Examples of valid values include:
x86_32, x86_64, etc.
|
|
type
|
no
|
string
|
None
|
The Operating System (OS) type.
Examples of valid values include:
linux, aix, mac, windows, etc.
|
|
distribution
|
no
|
string
|
None
|
The Operating System (OS) distribution.
Examples of valid values for an “type” of “Linux” would
include: debian, fedora, rhel and ubuntu.
|
|
version
|
no
|
version
|
None
|
The Operating System version.
|
C.3.9.2 Definition
|
tosca.capabilities.OperatingSystem:
derived_from: tosca.capabilities.Root
properties:
architecture:
type: string
required: false
type:
type: string
required: false
distribution:
type: string
required: false
version:
type: version
required: false
|
C.3.9.3 Additional Requirements
·
Please note that the string values for the properties architecture, type and distribution
SHALL be normalized to lowercase by processors of the service template for
matching purposes. For example, if a “type”
value is set to either “Linux”, “LINUX” or “linux” in a service template, the
processor would normalize all three values to “linux” for matching purposes.
C.3.9.4 Notes
·
None
C.3.10 tosca.capabilities.Scalable
This is the default TOSCA type that should be used
to express a scalability capability for a node.
|
Shorthand Name
|
Scalable
|
|
Type Qualified Name
|
tosca:Scalable
|
|
Type URI
|
tosca.capabilities.Scalable
|
C.3.10.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
min_instances
|
yes
|
integer
|
default: 1
|
This property is used to indicate the minimum number of
instances that should be created for the associated TOSCA Node Template by a
TOSCA orchestrator.
|
|
max_instances
|
yes
|
integer
|
default: 1
|
This property is used to indicate the maximum number of
instances that should be created for the associated TOSCA Node Template by a
TOSCA orchestrator.
|
|
default_instances
|
no
|
integer
|
N/A
|
An optional property that indicates the requested default
number of instances that should be the starting number of instances a TOSCA
orchestrator should attempt to allocate.
Note: The value for this property MUST be in the
range between the values set for ‘min_instances’ and ‘max_instances’ properties.
|
C.3.10.2 Definition
|
tosca.capabilities.Scalable:
derived_from: tosca.capabilities.Root
properties:
min_instances:
type: integer
default: 1
max_instances:
type: integer
default: 1
default_instances:
type: integer
|
C.3.10.3 Notes
·
The actual number of instances for a node may be governed by a
separate scaling policy which conceptually would be associated to either a
scaling-capable node or a group of nodes in which it is defined to be a part
of. This is a planned future feature of the TOSCA Simple Profile and not
currently described.
C.3.11
tosca.capabilities.network.Bindable
A node type that includes the Bindable capability
indicates that it can be bound to a logical network association via a network
port.
|
Shorthand Name
|
network.Bindable
|
|
Type Qualified Name
|
tosca:network.Bindable
|
|
Type URI
|
tosca.capabilities.network.Bindable
|
C.3.11.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
C.3.11.2 Definition
C.4
Requirement Types
There are no normative Requirement Types currently
defined in this working draft. Typically, Requirements are described against a
known Capability Type
C.5 Relationship Types
C.5.1 tosca.relationships.Root
This is the default (root) TOSCA Relationship Type
definition that all other TOSCA Relationship Types derive from.
C.5.1.1 Attributes
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
tosca_id
|
yes
|
string
|
None
|
A unique identifier of the realized instance of a
Relationship Template that derives from any TOSCA normative type.
|
|
tosca_name
|
yes
|
string
|
None
|
This attribute reflects the name of the Relationship
Template as defined in the TOSCA service template. This name is not unique
to the realized instance model of corresponding deployed application as each
template in the model can result in one or more instances (e.g., scaled) when
orchestrated to a provider environment.
|
C.5.1.2 Definition
|
tosca.relationships.Root:
description: The TOSCA root Relationship
Type all other TOSCA base Relationship Types derive from
attributes:
tosca_id:
type: string
tosca_name:
type: string
interfaces:
Configure:
type: tosca.interfaces.relationship.Configure
|
C.5.2 tosca.relationships.DependsOn
This type represents a general dependency
relationship between two nodes.
|
Shorthand Name
|
DependsOn
|
|
Type Qualified Name
|
tosca:DependsOn
|
|
Type URI
|
tosca.relationships.DependsOn
|
C.5.2.1 Definition
C.5.3 tosca.relationships.HostedOn
This type represents
a hosting relationship between two nodes.
|
Shorthand Name
|
HostedOn
|
|
Type Qualified Name
|
tosca:HostedOn
|
|
Type URI
|
tosca.relationships.HostedOn
|
C.5.3.1 Definition
C.5.4 tosca.relationships.ConnectsTo
This type represents
a network connection relationship between two nodes.
|
Shorthand Name
|
ConnectsTo
|
|
Type Qualified Name
|
tosca:ConnectsTo
|
|
Type URI
|
tosca.relationships.ConnectsTo
|
C.5.4.1 Definition
C.5.4.2 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
credential
|
no
|
Credential
|
None
|
The security credential to use to present to the target
endpoint to for either authentication or authorization purposes.
|
C.5.5 tosca.relationships.AttachesTo
This type represents
an attachment relationship between two nodes. For example, an AttachesTo
relationship type would be used for attaching a storage node to a Compute node.
|
Shorthand Name
|
AttachesTo
|
|
Type Qualified Name
|
tosca:AttachesTo
|
|
Type URI
|
tosca.relationships.AttachesTo
|
C.5.5.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
location
|
yes
|
string
|
min_length: 1
|
The relative location (e.g., path on the file system),
which provides the root location to address an attached node.
e.g., a mount point / path such as ‘/usr/data’
Note: The user must provide it and it cannot be “root”.
|
|
device
|
no
|
string
|
None
|
The logical device name which for the attached device
(which is represented by the target node in the model).
e.g., ‘/dev/hda1’
|
C.5.5.2 Attributes
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
device
|
no
|
string
|
None
|
The logical name of the device as exposed to the instance.
Note: A runtime property that gets set when the model gets
instantiated by the orchestrator.
|
C.5.5.3 Definition
C.5.6
tosca.relationships.RoutesTo
This type represents
an intentional network routing between two Endpoints in different networks.
|
Shorthand Name
|
RoutesTo
|
|
Type Qualified Name
|
tosca:RoutesTo
|
|
Type URI
|
tosca.relationships.RoutesTo
|
C.5.6.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
TBD
|
|
|
|
|
C.5.6.2 Attributes
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
TBD
|
|
|
|
|
C.5.6.3 Definition
C.6 Interface Types
Interfaces are reusable
entities that define a set of operations that that can be included as part of a
Node type or Relationship Type definition. Each named operations may have code
or scripts associated with them that orchestrators can execute for when
transitioning an application to a given state.
C.6.1 Additional Requirements
·
Designers of Node or Relationship types are not required to
actually provide/associate code or scripts with every operation for a given
interface it supports. In these cases, orchestrators SHALL consider that a “No
Operation” or “no-op”.
·
The default behavior when providing scripts for an operation in a
sub-type (sub-class) or a template of an existing type which already has a
script provided for that operation SHALL be override. Meaning that the
subclasses’ script is used in place of the parent type’s script.
C.6.2 Best Practices
·
When TOSCA Orchestrators substitute an implementation for an
abstract node in a deployed service template it SHOULD be able to present a
confirmation to the submitter to confirm the implementation chosen would be
acceptable.
C.6.3 tosca.interfaces.node.lifecycle.Standard
This lifecycle interface defines the essential,
normative operations that TOSCA nodes may support.
|
Shorthand Name
|
Standard
|
|
Type Qualified Name
|
tosca: Standard
|
|
Type URI
|
tosca.interfaces.node.lifecycle.Standard
|
C.6.3.1 Definition
|
tosca.interfaces.node.lifecycle.Standard:
create:
description: Standard lifecycle
create operation.
configure:
description: Standard lifecycle
configure operation.
start:
description: Standard lifecycle
start operation.
stop:
description: Standard lifecycle
stop operation.
delete:
description: Standard lifecycle
delete operation.
|
C.6.3.2
Create operation
The create operation is generally used to create the
resource or service the node represents in the topology. TOSCA orchestrators
expect node templates to provide either a deployment artifact or an
implementation artifact of a defined artifact type that it is able to process.
This specification defines normative deployment and implementation artifact
types all TOSCA Orchestrators are expected to be able to process to support
application portability.
C.6.3.3 Using TOSCA artifacts with interface
operations
# Bash script whose location is descried in the
TOSCA CSAR file
# 1) LOCAL SCOPE: symblic artifact name
<or> 2) GLOBAL: actual file name from CSAR
#
C.6.3.4 TOSCA Orchestrator processing of Deployment
artifacts
TOSCA Orchestrators, when encountering a deployment artifact
on the create operation; will automatically attempt to deploy the artifact
based upon its artifact type. This means that no implementation artifacts
(e.g., scripts) are needed on the create operation to provide commands that
deploy or install the software.
For example, if a TOSCA Orchestrator is processing an
application with a node of type SoftwareComponent and finds that the node’s
template has a create operation that provides a filename (or references to an
artifact which describes a file) of a known TOSCA deployment artifact type such
as an Open Virtualization Format (OVF) image it will automatically deploy that
image into the SoftwareComponent’s host Compute node.
C.6.3.5 Operation sequencing and node state
The following diagrams show how TOSCA orchestrators sequence
the operations of the Standard lifecycle in normal node startup and shutdown
procedures.
The following key should be used to interpret the diagrams:
C.6.3.5.1 Normal node
startup sequence diagram
The following diagram shows how the TOSCA orchestrator would invoke operations
on the Standard lifecycle to shut down a node.
C.6.3.5.2 Normal node
shutdown sequence diagram
The following diagram shows how the TOSCA orchestrator would invoke operations
on the Standard lifecycle to shut down a node.
C.6.4
tosca.interfaces.relationship.Configure
The lifecycle
interfaces define the essential, normative operations that each TOSCA
Relationship Types may support.
|
Shorthand Name
|
Configure
|
|
Type Qualified Name
|
tosca:Configure
|
|
Type URI
|
tosca.interfaces.relationship.Configure
|
C.6.4.1 Definition
|
tosca.interfaces.relationship.Configure:
pre_configure_source:
description: Operation to
pre-configure the source endpoint.
pre_configure_target:
description: Operation to
pre-configure the target endpoint.
post_configure_source:
description: Operation to
post-configure the source endpoint.
post_configure_target:
description: Operation to post-configure
the target endpoint.
add_target:
description: Operation to notify
the source node of a target node being added via a relationship.
add_source:
description: Operation to notify
the target node of a source node which is now available via a relationship.
description:
target_changed:
description: Operation to
notify source some property or attribute of the target changed
remove_target:
description: Operation to
remove a target node.
|
C.6.4.2
Invocation Conventions
TOSCA relationships are
directional connecting a source node to a target node. When TOSCA Orchestrator
connects a source and target node together using a relationship that supports
the Configure interface it will “interleave” the operations invocations of the
Configure interface with those of the node’s own Standard lifecycle interface.
This concept is illustrated below:
C.6.4.3 Normal node start sequence with Configure
relationship operations
The following diagram shows how the TOSCA orchestrator would invoke Configure lifecycle
operations in conjunction with Standard lifecycle operations during a typical
startup sequence on a node.
C.6.4.3.1 Node-Relationship configuration sequence
Depending on which side (i.e., source or target) of
a relationship a node is on, the orchestrator will:
Invoke either the pre_configure_source
or pre_configure_target operation as supplied by the
relationship on the node.
Invoke the node’s configure
operation.
Invoke either the post_configure_source
or post_configure_target as supplied by the relationship on
the node.
Note that
the pre_configure_xxx and post_configure_xxx are
invoked only once per node instance.
C.6.4.3.2 Node-Relationship add, remove and changed
sequence
Since a topology template contains nodes that can dynamically
be added (and scaled), removed or changed as part of an application instance,
the Configure lifecycle includes operations that are invoked on node instances
that to notify and address these dynamic changes.
For example, a source node, of a relationship that uses the
Configure lifecycle, will have the relationship operations add_target, or remove_target invoked on it whenever a target
node instance is added or removed to the running application instance. In
addition, whenever the node state of its target node changes, the target_changed operation is invoked on it to
address this change. Conversely, the add_source
and remove_source operations are
invoked on the source node of the relationship.
C.6.4.4 Notes
·
The target (provider) MUST be active and running (i.e., all its
dependency stack MUST be fulfilled) prior to invoking add_target
·
In other words, all Requirements MUST be satisfied before it
advertises its capabilities (i.e., the attributes of the matched Capabilities
are available).
·
In other words, it cannot be “consumed” by any dependent node.
·
Conversely, since the source (consumer) needs information
(attributes) about any targets (and their attributes) being removed before it
actually goes away.
·
The remove_target operation should only be executed
if the target has had add_target executed. BUT in truth we’re first informed
about a target in pre_configure_source, so if we execute that the
source node should see remove_target called to cleanup.
·
Error handling: If any node operation of the topology
fails processing should stop on that node template and the failing operation
(script) should return an error (failure) code when possible.
C.7
Node Types
C.7.1 tosca.nodes.Root
The TOSCA Root Node
Type is the default type that all other TOSCA base Node Types derive from.
This allows for all TOSCA nodes to have a consistent set of features for
modeling and management (e.g., consistent definitions for requirements,
capabilities and lifecycle interfaces).
|
Shorthand Name
|
Root
|
|
Type Qualified Name
|
tosca:Root
|
|
Type URI
|
tosca.nodes.Root
|
C.7.1.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
N/A
|
N/A
|
N/A
|
N/A
|
The TOSCA Root Node type has no specified properties.
|
C.7.1.2 Attributes
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
tosca_id
|
yes
|
string
|
None
|
A unique identifier of the realized instance of a Node
Template that derives from any TOSCA normative type.
|
|
tosca_name
|
yes
|
string
|
None
|
This attribute reflects the name of the Node Template as
defined in the TOSCA service template. This name is not unique to the
realized instance model of corresponding deployed application as each
template in the model can result in one or more instances (e.g., scaled) when
orchestrated to a provider environment.
|
|
state
|
yes
|
string
|
default: initial
|
The state of the node instance. See section “Node States” for allowed values.
|
C.7.1.3 Definition
C.7.1.4 Additional
Requirements
·
All Node Type definitions that wish to adhere to the TOSCA Simple
Profile SHOULD extend from the TOSCA Root Node Type to be assured of
compatibility and portability across implementations.
C.7.2 tosca.nodes.Compute
The TOSCA Compute node represents
one or more real or virtual processors of software applications or services
along with other essential local resources. Collectively, the resources the
compute node represents can logically be viewed as a (real or virtual)
“server”.
|
Shorthand Name
|
Compute
|
|
Type Qualified Name
|
tosca:Compute
|
|
Type URI
|
tosca.nodes.Compute
|
C.7.2.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
C.7.2.2 Attributes
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
private_address
|
no
|
string
|
None
|
The primary private IP address assigned by the cloud
provider that applications may use to access the Compute node.
|
|
public_address
|
no
|
string
|
None
|
The primary public IP address assigned by the cloud
provider that applications may use to access the Compute node.
|
|
networks
|
no
|
map of NetworkInfo
|
None
|
The list of logical networks assigned to the compute host
instance and information about them.
|
|
ports
|
no
|
map of PortInfo
|
None
|
The list of logical ports assigned to the compute host
instance and information about them.
|
C.7.2.3 Definition
C.7.3 tosca.nodes.SoftwareComponent
The TOSCA SoftwareComponent node
represents a generic software component that can be managed and run by a TOSCA Compute
Node Type.
|
Shorthand Name
|
SoftwareComponent
|
|
Type Qualified Name
|
tosca:SoftwareComponent
|
|
Type URI
|
tosca.nodes.SoftwareComponent
|
C.7.3.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
component_version
|
no
|
version
|
None
|
The software component’s version.
|
C.7.3.2 Attributes
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
C.7.3.3 Definition
C.7.3.4 Additional Requirements
·
Nodes that can directly be managed and run by a TOSCA Compute Node Type SHOULD extend from
this type.
C.7.4 tosca.nodes.WebServer
This TOSA WebServer Node Type
represents an abstract software component or service that is capable of hosting
and providing management operations for one or more WebApplication
nodes.
|
Shorthand Name
|
WebServer
|
|
Type Qualified Name
|
tosca:WebServer
|
|
Type URI
|
tosca.nodes.WebServer
|
C.7.4.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
None
|
N/A
|
N/A
|
N/A
|
N/A
|
C.7.4.2 Definition
C.7.4.3 Notes and Additional Requirements
·
This node SHALL export both a secure endpoint capability
(i.e., admin_endpoint), typically for
administration, as well as a regular endpoint (i.e., data_endpoint) for serving data.
C.7.5 tosca.nodes.WebApplication
The TOSCA WebApplication node represents
a software application that can be managed and run by a TOSCA WebServer
node. Specific types of web applications such as Java, etc. could be derived
from this type.
|
Shorthand Name
|
WebApplication
|
|
Type Qualified Name
|
tosca: WebApplication
|
|
Type URI
|
tosca.nodes.WebApplication
|
C.7.5.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
context_root
|
no
|
string
|
None
|
The web application’s
context root which designates the application’s URL path within the web
server it is hosted on.
|
C.7.5.2 Definition
C.7.5.3 Additional Requirements
·
None
C.7.6 tosca.nodes.DBMS
The TOSCA DBMS node
represents a typical relational, SQL Database Management System software
component or service.
C.7.6.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
root_password
|
no
|
string
|
None
|
The optional root password for the DBMS server.
|
|
port
|
no
|
integer
|
None
|
The DBMS server’s port.
|
C.7.6.2 Definition
|
tosca.nodes.DBMS:
derived_from: tosca.nodes.SoftwareComponent
properties:
root_password:
type: string
required: false
description: the optional root
password for the DBMS service
port:
type: integer
required: false
description: the port the
DBMS service will listen to for data and requests
capabilities:
host:
type: tosca.capabilities.Container
valid_source_types: [ tosca.nodes.Database ]
|
C.7.6.3 Additional Requirements
·
None
C.7.7 tosca.nodes.Database
The TOSCA Database node
represents a logical database that can be managed and hosted by a TOSCA DBMS
node.
|
Shorthand Name
|
Database
|
|
Type Qualified Name
|
tosca:Database
|
|
Type URI
|
tosca.nodes.Database
|
C.7.7.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
name
|
yes
|
string
|
None
|
The logical database Name
|
|
port
|
no
|
integer
|
None
|
The port the database service will use to listen for
incoming data and requests.
|
|
user
|
no
|
string
|
None
|
The special user account used for database administration.
|
|
password
|
no
|
string
|
None
|
The password associated with the user account provided in
the ‘user’ property.
|
C.7.7.2
Definition
|
tosca.nodes.Database:
derived_from: tosca.nodes.Root
properties:
name:
type: string
description: the logical
name of the database
port:
type: integer
description: the port the
underlying database service will listen to for data
user:
type: string
description: the optional user
account name for DB administration
required: false
password:
type: string
description: the optional password
for the DB user account
required: false
requirements:
- host:
capability: tosca.capabilities.Container
node: tosca.nodes.DBMS
relationship: tosca.relationships.HostedOn
capabilities:
database_endpoint:
type: tosca.capabilities.Endpoint.Database
|
C.7.8 tosca.nodes.ObjectStorage
The TOSCA ObjectStorage node
represents storage that provides the ability to store data as objects (or BLOBs
of data) without consideration for the underlying filesystem or devices.
|
Shorthand Name
|
ObjectStorage
|
|
Type Qualified Name
|
tosca:ObjectStorage
|
|
Type URI
|
tosca.nodes.ObjectStorage
|
C.7.8.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
name
|
yes
|
string
|
None
|
The logical name of the object store (or container).
|
|
size
|
no
|
scalar-unit.size
|
greater_or_equal: 0 GB
|
The requested initial storage size (default unit is in
Gigabytes).
|
|
maxsize
|
no
|
scalar-unit.size
|
greater_or_equal: 0 GB
|
The requested maximum storage size (default unit is in
Gigabytes).
|
C.7.8.2 Definition
C.7.8.3 Notes:
·
Subclasses of the ObjectStorage node may impose further
constraints on properties. For example, a subclass may constrain the (minimum
or maximum) length of the ‘name’ property or
include a regular expression to constrain allowed characters used in the ‘name’
property.
C.7.9 tosca.nodes.BlockStorage
The TOSCA BlockStorage
node currently represents a server-local block storage device (i.e., not
shared) offering evenly sized blocks of data from which raw storage volumes can
be created.
Note: In this draft of the TOSCA Simple
Profile, distributed or Network Attached Storage (NAS) are not yet considered
(nor are clustered file systems), but the TC plans to do so in future drafts.
|
Shorthand Name
|
BlockStorage
|
|
Type Qualified Name
|
tosca:BlockStorage
|
|
Type URI
|
tosca.nodes.BlockStorage
|
C.7.9.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
size
|
yes *
|
scalar-unit.size
|
greater_or_equal: 1 MB
|
The requested storage size (default unit is MB).
* Note:
·
Required when an existing volume (i.e., volume_id) is
not available.
·
If volume_id is provided, size is ignored. Resize of existing
volumes is not considered at this time.
|
|
volume_id
|
no
|
string
|
None
|
ID of an existing volume (that is in the accessible scope of
the requesting application).
|
|
snapshot_id
|
no
|
string
|
None
|
Some identifier that represents an existing snapshot that
should be used when creating the block storage (volume).
|
C.7.9.2 Attributes
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
C.7.9.3 Definition
C.7.9.4 Additional Requirements
·
The size property is required when an existing
volume (i.e., volume_id) is not available. However, if the
property volume_id is provided, the size
property is ignored.
C.7.9.5 Notes
·
Resize is of existing volumes is not considered at this time.
·
It is assumed that the volume contains a single filesystem that
the operating system (that is hosting an associate application) can recognize
and mount without additional information (i.e., it is operating system independent).
·
Currently, this version of the Simple Profile does not consider
regions (or availability zones) when modeling storage.
C.7.10 tosca.nodes.Container.Runtime
The TOSCA Container Runtime node represents
operating system-level virtualization technology used to run multiple
application services on a single Compute host.
|
Shorthand Name
|
Container.Runtime
|
|
Type Qualified Name
|
tosca:Container.Runtime
|
|
Type URI
|
tosca.nodes.Container.Runtime
|
C.7.10.1 Definition
C.7.11 tosca.nodes.Container.Application
The TOSCA Container Application node
represents an application that requires Container-level
virtualization technology.
|
Shorthand Name
|
Container.Application
|
|
Type Qualified Name
|
tosca:Container.Application
|
|
Type URI
|
tosca.nodes.Container.Application
|
C.7.11.1 Definition
C.7.12
tosca.nodes.LoadBalancer
The TOSCA Load Balancer node
represents logical function that be used in conjunction with a Floating Address
to distribute an application’s traffic (load) across a number of instances of
the application (e.g., for a clustered or scaled application).
|
Shorthand Name
|
LoadBalancer
|
|
Type Qualified Name
|
tosca:LoadBalancer
|
|
Type URI
|
tosca.nodes.LoadBalancer
|
C.7.12.1 Definition
C.7.13 Notes:
·
A LoadBalancer node can still be instantiated and
managed independently of any applications it would serve; therefore, the load
balancer’s application requirement allows for zero
occurrences.
C.8 Artifact Types
TOSCA Artifacts represent the packages and imperative used
by the orchestrator when invoking TOSCA Interfaces on Node or Relationship
Types. Currently, artifacts are logically divided into three categories:
·
Deployment Types: includes those artifacts that are used
during deployment (e.g., referenced on create and install operations) and include
packaging files such as RPMs, ZIPs, or TAR files.
·
Implementation Types: includes those artifacts that
represent imperative logic and are used to implement TOSCA Interface
operations. These typically include scripting languages such as Bash (.sh), Chef
and Puppet.
·
Runtime Types: includes those artifacts that are used
during runtime by a service or component of the application. This could
include a library or language runtime that is needed by an application such as
a PHP or Java library.
Note: Normative TOSCA Artifact Types will be
developed in future drafts of this specification.
C.8.1 tosca.artifacts.Root
This is the default (root) TOSCA Artifact Type definition that all other
TOSCA base Artifact Types derive from.
C.8.1.1 Definition
|
tosca.artifacts.Root:
description: The TOSCA Artifact
Type all other TOSCA Artifact Types derive from
|
C.8.2 tosca.artifacts.File
This artifact type is used when an artifact
definition needs to have its associated file simply treated as a file and no
special handling/handlers are invoked (i.e., it is not treated as either an
implementation or deployment artifact type).
|
Shorthand Name
|
File
|
|
Type Qualified Name
|
tosca:File
|
|
Type URI
|
tosca.artifacts.File
|
C.8.2.1 Definition
C.8.3 Deployment Types
C.8.3.1
tosca.artifacts.Deployment
This artifact type represents the parent type for
all deployment artifacts in TOSCA. This class of artifacts typically represents
a binary packaging of an application or service that is used to install/create
or deploy it as part of a node’s lifecycle.
C.8.3.1.1 Definition
|
tosca.artifacts.Deployment:
derived_from: tosca.artifacts.Root
description: TOSCA base type
for deployment artifacts
|
|
|
|
C.8.3.2
tosca.artifacts.Deployment.Image
This artifact type represents a parent type for any
“image” which is an opaque packaging of a TOSCA Node’s deployment (whether real
or virtual) whose contents are typically already installed and pre-configured
(i.e., “stateful”) and prepared to be run on a known target container.
|
Shorthand Name
|
Deployment.Image
|
|
Type Qualified Name
|
tosca:Deployment.Image
|
|
Type URI
|
tosca.artifacts.Deployment.Image
|
C.8.3.2.1 Definition
C.8.4
tosca.artifacts.Deployment.Image.VM
This artifact represents the parent type for all Virtual
Machine (VM) image and container formatted deployment artifacts. These images
contain a stateful capture of a machine (e.g., server) including operating
system and installed software along with any configurations and can be run on
another machine using a hypervisor which virtualizes typical server (i.e.,
hardware) resources.
C.8.4.1 Definition
C.8.4.2 Notes:
·
Future drafts of this specification may include popular standard
VM disk image (e.g., ISO, VMI, VMDX, QCOW2, etc.) and container (e.g., OVF,
bare, etc.) formats. These would include consideration of disk formats such
as:
C.8.5 Implementation Types
C.8.5.1 tosca.artifacts.Implementation
This artifact type represents the parent type for
all implementation artifacts in TOSCA. These artifacts are used to implement
operations of TOSCA interfaces either directly (e.g., scripts) or indirectly
(e.g., config. files).
C.8.5.1.1 Definition
|
tosca.artifacts.Implementation:
derived_from: tosca.artifacts.Root
description: TOSCA base type
for implementation artifacts
|
|
|
|
C.8.5.2
tosca.artifacts.Implementation.Bash
This artifact type represents a Bash script type
that contains Bash commands that can be executed on the Unix Bash shell.
|
Shorthand Name
|
Bash
|
|
Type Qualified Name
|
tosca:Bash
|
|
Type URI
|
tosca.artifacts.Implementation.Bash
|
C.8.5.2.1 Definition
|
tosca.artifacts.Implementation.Bash:
derived_from: tosca.artifacts.Implementation
description: Script artifact for
the Unix Bash shell
mime_type: application/x-sh
file_ext: [ sh ]
|
C.8.5.3 tosca.artifacts.Implementation.Python
This artifact type represents a Python file that contains
Python language constructs that can be executed within a Python interpreter.
|
Shorthand Name
|
Python
|
|
Type Qualified Name
|
tosca:Python
|
|
Type URI
|
tosca.artifacts.Implementation.Python
|
C.8.5.3.1 Definition
|
tosca.artifacts.Implementation.Python:
derived_from:
tosca.artifacts.Implementation
description: Artifact for the
interpreted Python language
mime_type: application/x-python
file_ext: [ py ]
|
This section defines non-normative types used in examples or
use cases within this specification.
D.1 Artifact Types
D.1.1 tosca.artifacts.Deployment.Image.Container.Docker
This artifact represents a Docker “image” (a TOSCA
deployment artifact type) which is a binary comprised of one or more (a union
of read-only and read-write) layers created from snapshots within the
underlying Docker Union
File System.
D.1.1.1 Definition
D.1.2
tosca.artifacts.Deployment.Image.VM.ISO
A Virtual Machine (VM) formatted as an ISO standard disk
image.
D.1.2.1 Definition
D.2 Capability Types
D.2.1 tosca.capabilities.Container.Docker
The type indicates capabilities of a Docker runtime
environment (client).
|
Shorthand Name
|
Container.Docker
|
|
Type Qualified Name
|
tosca:Container.Docker
|
|
Type URI
|
tosca.capabilities.Container.Docker
|
D.2.1.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
version
|
no
|
version[]
|
None
|
The Docker version capability (i.e., the versions
supported by the capability).
|
|
publish_all
|
no
|
boolean
|
default: false
|
Indicates that all ports (ranges) listed in the dockerfile
using the EXPOSE keyword be published.
|
|
publish_ports
|
no
|
list of PortSpec
|
None
|
List of ports mappings from source (Docker container) to
target (host) ports to publish.
|
|
expose_ports
|
no
|
list of PortSpec
|
None
|
List of ports mappings from source (Docker container) to
expose to other Docker containers (not accessible outside host).
|
|
volumes
|
no
|
list of string
|
None
|
The dockerfile VOLUME command which is used to
enable access from the Docker container to a directory on the host machine.
|
|
host_id
|
no
|
string
|
None
|
The optional identifier of an existing host resource that
should be used to run this container on.
|
|
volume_id
|
no
|
string
|
None
|
The optional identifier of an existing storage volume
(resource) that should be used to create the container’s mount point(s) on.
|
D.2.1.2 Definition
|
tosca.capabilities.Container.Docker:
derived_from: tosca.capabilities.Container
properties:
version:
type: list
required: false
entry_schema: version
publish_all:
type: boolean
default: false
required: false
publish_ports:
type: list
entry_schema: PortSpec
required: false
expose_ports:
type: list
entry_schema: PortSpec
required: false
volumes:
type: list
entry_schema: string
required: false
|
D.2.1.3 Additional requirements
·
When the expose_ports property is used, only the source and source_range properties of PortSpec SHALL
be valid for supplying port numbers or ranges, the target and target_range properties are ignored.
D.3 Node Types
D.3.1 tosca.nodes.Database.MySQL
D.3.1.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
None
|
N/A
|
N/A
|
N/A
|
N/A
|
D.3.1.2 Definition
D.3.2 tosca.nodes.DBMS.MySQL
D.3.2.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
None
|
N/A
|
N/A
|
N/A
|
N/A
|
D.3.2.2 Definition
|
tosca.nodes.DBMS.MySQL:
derived_from: tosca.nodes.DBMS
properties:
port:
description: reflect the
default MySQL server port
default: 3306
root_password:
# MySQL requires a
root_password for configuration
required: true
capabilities:
# Further constrain the ‘host’
capability to only allow MySQL databases
host:
valid_source_types: [ tosca.nodes.Database.MySQL ]
|
D.3.3 tosca.nodes.WebServer.Apache
D.3.3.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
None
|
N/A
|
N/A
|
N/A
|
N/A
|
D.3.3.2 Definition
D.3.4 tosca.nodes.WebApplication.WordPress
D.3.4.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
None
|
N/A
|
N/A
|
N/A
|
N/A
|
D.3.4.2 Definition
D.3.5 tosca.nodes.WebServer.Nodejs
D.3.5.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
TBD
|
N/A
|
N/A
|
N/A
|
N/A
|
D.3.5.2 Definition
|
tosca.nodes.WebServer.Nodejs:
derived_from: tosca.nodes.WebServer
properties:
# Property to supply the
desired implementation in the Github repository
github_url:
required: no
type: string
description: location of the
application on the github.
default:
https://github.com/mmm/testnode.git
interfaces:
Standard:
inputs:
github_url:
type: string
|
D.3.6 tosca.nodes.Container.Application.Docker
D.3.6.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
None
|
N/A
|
N/A
|
N/A
|
N/A
|
D.3.6.2 Definition
|
tosca.nodes.Container.Application.Docker:
derived_from: tosca.nodes.Container.Application
requirements:
- host:
capability:
tosca.capabilities.Container.Docker
|
TOSCA Simple Profile definitions along with all accompanying
artifacts (e.g. scripts, binaries, configuration files) can be packaged
together in a CSAR file as already defined in the TOSCA version 1.0
specification [TOSCA-1.0]. In contrast to the TOSCA
1.0 CSAR file specification (see chapter 16 in [TOSCA-1.0]),
this simple profile makes a few simplifications both in terms of overall CSAR
file structure as well as meta-file content as described below.
E.1 Overall Structure of a
CSAR
A CSAR zip file is required to contain a TOSCA-Metadata directory, which in turn
contains the TOSCA.meta
metadata file that provides entry information for a TOSCA orchestrator
processing the CSAR file.
The CSAR file may contain other directories with arbitrary
names and contents. Note that in contrast to the TOSCA 1.0 specification, it is
not required to put TOSCA definitions files into a special “Definitions”
directory, but definitions YAML files can be placed into any directory within
the CSAR file.
E.2 TOSCA Meta File
The TOSCA.meta
file structure follows the exact same syntax as defined in the TOSCA 1.0
specification. However, it is only required to include block_0 (see
section 16.2 in [TOSCA-1.0]) with the Entry-Definitions keyword pointing to a
valid TOSCA definitions YAML file that a TOSCA orchestrator should use as entry
for parsing the contents of the overall CSAR file.
Note that it is not required to explicitly list TOSCA
definitions files in subsequent blocks of the TOSCA.meta
file, but any TOSCA definitions files besides the one denoted by the Entry-Definitions keyword can be found
by a TOSCA orchestrator by processing respective imports statements in the entry definitions file (or in
recursively imported files).
Note also that any additional artifact files (e.g. scripts,
binaries, configuration files) do not have to be declared explicitly through
blocks in the TOSCA.meta file.
Instead, such artifacts will be fully described and pointed to by relative path
names through artifact definitions in one of the TOSCA definitions files
contained in the CSAR.
Due to the simplified structure of the CSAR file and TOSCA.meta file compared to TOSCA 1.0,
the CSAR-Version keyword
listed in block_0 of the meta-file is required to denote version 1.1.
E.2.1 Example
The following listing represents a valid TOSCA.meta file according to this TOSCA
Simple Profile specification.
|
TOSCA-Meta-File-Version: 1.0
CSAR-Version: 1.1
Created-By: OASIS TOSCA TC
Entry-Definitions: definitions/tosca_elk.yaml
|
This TOSCA.meta
file indicates its simplified TOSCA Simple Profile structure by means of the CSAR-Version keyword with value 1.1. The Entry-Definitions keyword points to a TOSCA definitions
YAML file with the name tosca_elk.yaml
which is contained in a directory called definitions
within the root of the CSAR file.
This describes how to express and control the application
centric network semantics available in TOSCA.
F.1
Networking and Service Template Portability
TOSCA Service Templates are application centric in the sense
that they focus on describing application components in terms of their
requirements and interrelationships. In order to provide cloud portability, it
is important that a TOSCA Service Template avoid cloud specific requirements
and details. However, at the same time, TOSCA must provide the expressiveness to
control the mapping of software component connectivity to the network
constructs of the hosting cloud.
TOSCA Networking takes the following approach.
1. The
application component connectivity semantics and expressed in terms of
Requirements and Capabilities and the relationships between these. Service
Template authors are able to express the interconnectivity requirements of
their software components in an abstract, declarative, and thus highly portable
manner.
2. The
information provided in TOSCA is complete enough for a TOSCA implementation to
fulfill the application component network requirements declaratively (i.e., it
contains information such as communication initiation and layer 4 port
specifications) so that the required network semantics can be realized on
arbitrary network infrastructures.
3. TOSCA
Networking provides full control of the mapping of software component
interconnectivity to the networking constructs of the hosting cloud network
independently of the Service Template, providing the required separation
between application and network semantics to preserve Service Template
portability.
4. Service
Template authors have the choice of specifying application component networking
requirements in the Service Template or completely separating the application
component to network mapping into a separate document. This allows application
components with explicit network requirements to express them while allowing
users to control the complete mapping for all software components which may not
have specific requirements. Usage of these two approaches is possible
simultaneously and required to avoid having to re-write components network
semantics as arbitrary sets of components are assembled into Service Templates.
5. Defining
a set of network semantics which are expressive enough to address the most
common application connectivity requirements while avoiding dependencies on
specific network technologies and constructs. Service Template authors and
cloud providers are able to express unique/non-portable semantics by defining
their own specialized network Requirements and Capabilities.
F.2
Connectivity Semantics
TOSCA’s application centric approach includes the modeling
of network connectivity semantics from an application component connectivity
perspective. The basic premise is that applications contain components which
need to communicate with other components using one or more endpoints over a
network stack such as TCP/IP, where connectivity between two components is
expressed as a <source component, source address, source port, target
component, target address, target port> tuple. Note that source and target
components are added to the traditional 4 tuple to provide the application
centric information, mapping the network to the source or target component
involved in the connectivity.
Software components are expressed as Node Types in TOSCA
which can express virtually any kind of concept in a TOSCA model. Node Types
offering network based functions can model their connectivity using a special
Endpoint Capability. tosca.capabilities.Endpoint,
designed for this purpose. Node Types which require an Endpoint can specify
this as a TOSCA requirement. A special Relationship Type, tosca.relationships.ConnectsTo,
is used to implicitly or explicitly relate the source Node Type’s endpoint to
the required endpoint in the target node type. Since
tosca.capabilities.Endpoint and tosca.relationships.ConnectsTo are TOSCA types,
they can be used in templates and extended by subclassing in the usual ways,
thus allowing the expression of additional semantics as needed.
The following diagram shows how the TOSCA node, capability and relationship
types enable modeling the application layer decoupled from the network model
intersecting at the Compute node using the
Bindable capability type.
As you can see, the Port
node type effectively acts a broker node between the Network node description
and a host Compute node of an application.
F.3
Expressing connectivity semantics
This section describes how TOSCA supports the typical
client/server and group communication semantics found in application
architectures.
F.3.1 Connection initiation semantics
The tosca.relationships.ConnectsTo expresses that requirement
that a source application component needs to be able to communicate with a
target software component to consume the services of the target. ConnectTo is a
component interdependency semantic in the most general sense and does not try
imply how the communication between the source and target components is
physically realized.
Application component intercommunication typically has
conventions regarding which component(s) initiate the communication. Connection
initiation semantics are specified in tosca.capabilities.Endpoint.
Endpoints at each end of the tosca.relationships.ConnectsTo
must indicate identical connection initiation semantics.
The following sections describe the normative connection
initiation semantics for the tosca.relationships.ConnectsTo Relationship Type.
F.3.1.1 Source to Target
The Source to Target communication initiation semantic is
the most common case where the source component initiates communication with
the target component in order to fulfill an instance of the
tosca.relationships.ConnectsTo relationship. The typical case is a “client”
component connecting to a “server” component where the client initiates a
stream oriented connection to a pre-defined transport specific port or set of
ports.
It is the responsibility of the TOSCA implementation to
ensure the source component has a suitable network path to the target component
and that the ports specified in the respective tosca.capabilities.Endpoint are
not blocked. The TOSCA implementation may only represent state of the
tosca.relationships.ConnectsTo relationship as fulfilled after the actual
network communication is enabled and the source and target components are in
their operational states.
Note that the connection initiation semantic only impacts
the fulfillment of the actual connectivity and does not impact the node
traversal order implied by the tosca.relationships.ConnectsTo Relationship
Type.
F.3.1.2 Target to Source
The Target to Source communication initiation semantic is a
less common case where the target component initiates communication with the
source comment in order to fulfill an instance of the
tosca.relationships.ConnectsTo relationship. This “reverse” connection initiation
direction is typically required due to some technical requirements of the
components or protocols involved, such as the requirement that SSH mush only be
initiated from target component in order to fulfill the services required by
the source component.
It is the responsibility of the TOSCA implementation to
ensure the source component has a suitable network path to the target component
and that the ports specified in the respective tosca.capabilities.Endpoint are
not blocked. The TOSCA implementation may only represent state of the
tosca.relationships.ConnectsTo relationship as fulfilled after the actual
network communication is enabled and the source and target components are in
their operational states.
Note that the connection initiation semantic only impacts
the fulfillment of the actual connectivity and does not impact the node
traversal order implied by the tosca.relationships.ConnectsTo Relationship
Type.
F.3.1.3 Peer-to-Peer
The Peer-to-Peer communication initiation semantic allows
any member of a group to initiate communication with any other member of the
same group at any time. This semantic typically appears in clustering and
distributed services where there is redundancy of components or services.
It is the responsibility of the TOSCA implementation to
ensure the source component has a suitable network path between all the member
component instances and that the ports specified in the respective
tosca.capabilities.Endpoint are not blocked, and the appropriate multicast
communication, if necessary, enabled. The TOSCA implementation may only
represent state of the tosca.relationships.ConnectsTo relationship as fulfilled
after the actual network communication is enabled such that at least one member
component of the group may reach any other member component of the group.
Endpoints specifying the Peer-to-Peer initiation semantic
need not be related with a tosca.relationships.ConnectsTo relationship for the
common case where the same set of component instances must communicate with
each other.
Note that the connection initiation semantic only impacts
the fulfillment of the actual connectivity and does not impact the node
traversal order implied by the tosca.relationships.ConnectsTo Relationship
Type.
F.3.2 Specifying layer 4 ports
TOSCA Service Templates must express enough details about
application component intercommunication to enable TOSCA implementations to
fulfill these communication semantics in the network infrastructure. TOSCA
currently focuses on TCP/IP as this is the most pervasive in today’s cloud
infrastructures. The layer 4 ports required for application component
intercommunication are specified in tosca.capabilities.Endpoint. The union of
the port specifications of both the source and target
tosca.capabilities.Endpoint which are part of the
tosca.relationships.ConnectsTo Relationship Template are interpreted as the
effective set of ports which must be allowed in the network communication.
The meaning of Source and Target port(s) corresponds to the
direction of the respective tosca.relationships.ConnectsTo.
F.4
Network provisioning
F.4.1 Declarative network provisioning
TOSCA orchestrators are responsible for the provisioning of
the network connectivity for declarative TOCSA Service Templates (Declarative
TOCSA Service Templates don’t contain explicit plans). This means that the
TOSCA orchestrator must be able to infer a suitable logical connectivity model
from the Service Template and then decide how to provision the logical
connectivity, referred to as “fulfillment”, on the available underlying infrastructure.
In order to enable fulfillment, sufficient technical details still must be
specified, such as the required protocols, ports and QOS information. TOSCA
connectivity types, such as tosca.capabilities.Endpoint, provide well defined
means to express these details.
F.4.2 Implicit network fulfillment
TOSCA Service Templates are by default network agnostic.
TOSCA’s application centric approach only requires that a TOSCA Service
Template contain enough information for a TOSCA orchestrator to infer suitable
network connectivity to meet the needs of the application components. Thus
Service Template designers are not required to be aware of or provide specific
requirements for underlying networks. This approach yields the most portable
Service Templates, allowing them to be deployed into any infrastructure which
can provide the necessary component interconnectivity.
F.4.3 Controlling network fulfillment
TOSCA provides mechanisms for providing control over network
fulfillment.
This mechanism allows the application network designer to
express in service template or network template how the networks should be
provisioned.
For the use cases described below let’s assume we have a
typical 3-tier application which is consisting of FE (frontend), BE (backend)
and DB (database) tiers. The simple application topology diagram can be shown
below:
Figure‑5: Typical 3-Tier Network
F.4.3.1 Use case: OAM Network
When deploying an application in service provider’s
on-premise cloud, it’s very common that one or more of the application’s
services should be accessible from an ad-hoc OAM (Operations, Administration and
Management) network which exists in the service provider backbone.
As an application network designer, I’d like to express in
my TOSCA network template (which corresponds to my TOSCA service template) the
network CIDR block, start ip, end ip and segmentation ID (e.g. VLAN id).
The diagram below depicts a typical 3-tiers application with
specific networking requirements for its FE tier server cluster:
F.4.3.2 Use case: Data Traffic network
The diagram below defines a set of networking requirements
for the backend and DB tiers of the 3-tier app mentioned above.
F.4.3.3 Use case: Bring my own DHCP
The same 3-tier app requires for its admin traffic network
to manage the IP allocation by its own DHCP which runs autonomously as part of
application domain.
For this purpose, the app network designer would like to
express in TOSCA that the underlying provisioned network will be set with
DHCP_ENABLED=false. See this illustrated in the figure below:
F.5 Network Types
F.5.1 tosca.nodes.network.Network
The TOSCA Network node represents
a simple, logical network service.
|
Shorthand Name
|
Network
|
|
Type Qualified Name
|
tosca:Network
|
|
Type URI
|
tosca.nodes.network.Network
|
F.5.1.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
ip_version
|
no
|
integer
|
valid_values: [4 , 6]
default: 4
|
The IP version of the requested network
|
|
cidr
|
no
|
string
|
None
|
The cidr block of the requested network
|
|
start_ip
|
no
|
string
|
None
|
The IP address to be used as the 1st one in a
pool of addresses derived from the cidr block full IP range
|
|
end_ip
|
no
|
string
|
None
|
The IP address to be used as the last one in a pool of
addresses derived from the cidr block full IP range
|
|
gateway_ip
|
no
|
string
|
None
|
The gateway IP address.
|
|
network_name
|
no
|
string
|
None
|
An Identifier that represents an existing Network instance
in the underlying cloud infrastructure – OR – be used as the name of the new
created network.
·
If network_name is provided along with network_id
they will be used to uniquely identify an existing network and not creating a
new one, means all other possible properties are not allowed.
·
network_name
should be more convenient for using. But in case that network name uniqueness
is not guaranteed then one should provide a network_id as well.
|
|
network_id
|
no
|
string
|
None
|
An Identifier that represents an existing Network instance
in the underlying cloud infrastructure.
This property is mutually exclusive with all other
properties except network_name.
·
Appearance of network_id in network template
instructs the Tosca container to use an existing network instead of creating
a new one.
·
network_name
should be more convenient for using. But in case that network name uniqueness
is not guaranteed then one should add a network_id as well.
·
network_name
and network_id
can be still used together to achieve both uniqueness and convenient.
|
|
segmentation_id
|
no
|
string
|
None
|
A segmentation identifier in the underlying cloud
infrastructure (e.g., VLAN id, GRE tunnel id). If
the segmentation_id is
specified, the network_type
or physical_network properties should be provided as well.
|
|
network_type
|
no
|
string
|
None
|
Optionally, specifies the nature
of the physical network in the underlying cloud infrastructure. Examples are
flat, vlan, gre or vxlan. For flat and vlan types, physical_network should
be provided too.
|
|
physical_network
|
no
|
string
|
None
|
Optionally, identifies the
physical network on top of which the network is implemented, e.g. physnet1.
This property is required if network_type
is flat or vlan.
|
|
dhcp_enabled
|
no
|
boolean
|
default: true
|
Indicates the TOSCA container to create a virtual network
instance with or without a DHCP service.
|
F.5.1.2 Attributes
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
segmentation_id
|
no
|
string
|
None
|
The actual segmentation_id that is been assigned to
the network by the underlying cloud infrastructure.
|
F.5.1.3 Definition
|
tosca.nodes.network.Network:
derived_from: tosca.nodes.Root
properties:
ip_version:
type: integer
required: false
default: 4
constraints:
- valid_values: [ 4, 6 ]
cidr:
type: string
required: false
start_ip:
type: string
required: false
end_ip:
type: string
required: false
gateway_ip:
type: string
required: false
network_name:
type: string
required: false
network_id:
type: string
required: false
segmentation_id:
type: string
required: false
network_type:
type: string
required: false
physical_network:
type: string
required: false
capabilities:
link:
type: tosca.capabilities.network.Linkable
|
F.5.1.4 Additional Requirements
·
None
F.5.2 tosca.nodes.network.Port
The TOSCA Port node
represents a logical entity that associates between Compute and Network
normative types.
The Port node type effectively represents a single
virtual NIC on the Compute node instance.
|
Shorthand Name
|
Port
|
|
Type Qualified Name
|
tosca:Port
|
|
Type URI
|
tosca.nodes.network.Port
|
F.5.2.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
ip_address
|
no
|
string
|
None
|
Allow the user to set a fixed IP address.
Note that this address is a request to the provider which
they will attempt to fulfil but may not be able to dependent on the network
the port is associated with.
|
|
order
|
no
|
integer
|
greater_or_equal: 0
default: 0
|
The order of the NIC on the compute instance (e.g. eth2).
Note: when binding more than one port to a single compute
(aka multi vNICs) and ordering is desired, it is *mandatory* that all ports
will be set with an order value and. The order values must represent a
positive, arithmetic progression that starts with 0 (e.g. 0, 1, 2, …, n).
|
|
is_default
|
no
|
boolean
|
default: false
|
Set is_default=true to apply a default gateway
route on the running compute instance to the associated network gateway.
Only one port that is associated to single compute node
can set as default=true.
|
|
ip_range_start
|
no
|
string
|
None
|
Defines the starting IP of a range to be allocated for the
compute instances that are associated by this Port.
Without setting this property the IP allocation is done
from the entire CIDR block of the network.
|
|
ip_range_end
|
no
|
string
|
None
|
Defines the ending IP of a range to be allocated for the
compute instances that are associated by this Port.
Without setting this property the IP allocation is done
from the entire CIDR block of the network.
|
F.5.2.2 Attributes
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
ip_address
|
no
|
string
|
None
|
The IP address would be assigned to the associated compute
instance.
|
F.5.2.3 Definition
|
tosca.nodes.network.Port:
derived_from: tosca.nodes.Root
properties:
ip_address:
type: string
required: false
order:
type: integer
required: true
default: 0
constraints:
- greater_or_equal: 0
is_default:
type: boolean
required: false
default: false
ip_range_start:
type: string
required: false
ip_range_end:
type: string
required: false
requirements:
- link:
capability: tosca.capabilities.network.Linkable
relationship: tosca.relationships.network.LinksTo
- binding:
capability: tosca.capabilities.network.Bindable
relationship: tosca.relationships.network.BindsTo
|
F.5.2.4 Additional Requirements
·
None
F.5.3
tosca.capabilities.network.Linkable
A node type that includes the Linkable capability
indicates that it can be pointed by tosca.relationships.network.LinksTo
relationship type.
|
Shorthand Name
|
Linkable
|
|
Type Qualified Name
|
tosca:.Linkable
|
|
Type URI
|
tosca.capabilities.network.Linkable
|
F.5.3.1 Properties
|
Name
|
Required
|
Type
|
Constraints
|
Description
|
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
F.5.3.2 Definition
F.5.4
tosca.relationships.network.LinksTo
This relationship type represents an association
relationship between Port and Network node types.
|
Shorthand Name
|
LinksTo
|
|
Type Qualified Name
|
tosca:LinksTo
|
|
Type URI
|
tosca.relationships.network.LinksTo
|
F.5.4.1 Definition
F.5.5
tosca.relationships.network.BindsTo
This type represents a network association
relationship between Port and Compute node types.
|
Shorthand Name
|
network.BindsTo
|
|
Type Qualified Name
|
tosca:BindsTo
|
|
Type URI
|
tosca.relationships.network.BindsTo
|
F.5.5.1 Definition
F.6
Network modeling approaches
F.6.1 Option 1: Specifying a network outside the
application’s Service Template
This approach allows someone who understands the
application’s networking requirements, mapping the details of the underlying
network to the appropriate node templates in the application.
The motivation for this approach is providing the
application network designer a fine-grained control on how networks are
provisioned and stitched to its application by the TOSCA orchestrator and
underlying cloud infrastructure while still preserving the portability of his
service template. Preserving the portability means here not doing any
modification in service template but just “plug-in” the desired network
modeling. The network modeling can reside in the same service template file but
the best practice should be placing it in a separated self-contained network
template file.
This “pluggable” network template approach introduces a new
normative node type called Port, capability called tosca.capabilities.network.Linkable
and relationship type called tosca.relationships.network.LinksTo.
The idea of the Port is to elegantly associate the desired
compute nodes with the desired network nodes while not “touching” the compute
itself.
The following diagram series demonstrate the plug-ability
strength of this approach.
Let’s assume an application designer has modeled a
service template as shown in Figure 1 that describes the application topology
nodes (compute, storage, software components, etc.) with their relationships.
The designer ideally wants to preserve this service template and use it in any
cloud provider environment without any change.
Figure‑6: Generic Service Template
When the application designer comes to consider its
application networking requirement they typically call the network
architect/designer from their company (who has the correct expertise).
The network designer, after understanding the
application connectivity requirements and optionally the target cloud provider
environment, is able to model the network template and plug it to the service
template as shown in Figure 2:
Figure‑7: Service template with network template
A
When there’s a new target cloud environment to run
the application on, the network designer is simply creates a new network
template B that corresponds to the new environmental conditions and provide it
to the application designer which packs it into the application CSAR.
Figure‑8: Service template with network template
B
The node templates for these three networks would be
defined as follows:
|
node_templates:
frontend:
type: tosca.nodes.Compute
properties: # omitted for
brevity
backend:
type: tosca.nodes.Compute
properties: # omitted for
brevity
database:
type: tosca.nodes.Compute
properties: # omitted for
brevity
oam_network:
type: tosca.nodes.network.Network
properties: # omitted for
brevity
admin_network:
type: tosca.nodes.network.Network
properties: # omitted for
brevity
data_network:
type: tosca.nodes.network.Network
properties: # omitted for
brevity
# ports definition
fe_oam_net_port:
type: tosca.nodes.network.Port
properties:
is_default: true
ip_range_start: { get_input:
fe_oam_net_ip_range_start }
ip_range_end: { get_input:
fe_oam_net_ip_range_end }
requirements:
- link: oam_network
- binding: frontend
fe_admin_net_port:
type: tosca.nodes.network.Port
requirements:
- link: admin_network
- binding: frontend
be_admin_net_port:
type: tosca.nodes.network.Port
properties:
order: 0
requirements:
- link: admin_network
- binding: backend
be_data_net_port:
type: tosca.nodes.network.Port
properties:
order: 1
requirements:
- link: data_network
- binding: backend
db_data_net_port:
type: tosca.nodes.network.Port
requirements:
- link: data_network
- binding: database
|
F.6.2 Option 2: Specifying network requirements
within the application’s Service Template
This approach allows the Service Template designer to map an
endpoint to a logical network.
The use case shown below examines a way to express
in the TOSCA YAML service template a typical 3-tier application with their
required networking modeling:
|
node_templates:
frontend:
type: tosca.nodes.Compute
properties: # omitted for
brevity
requirements:
- network_oam: oam_network
- network_admin:
admin_network
backend:
type: tosca.nodes.Compute
properties: # omitted for
brevity
requirements:
- network_admin:
admin_network
- network_data: data_network
database:
type: tosca.nodes.Compute
properties: # omitted for
brevity
requirements:
- network_data: data_network
oam_network:
type: tosca.nodes.network.Network
properties:
ip_version: { get_input:
oam_network_ip_version }
cidr: { get_input:
oam_network_cidr }
start_ip: { get_input:
oam_network_start_ip }
end_ip: { get_input:
oam_network_end_ip }
admin_network:
type: tosca.nodes.network.Network
properties:
ip_version: { get_input:
admin_network_ip_version }
dhcp_enabled: { get_input:
admin_network_dhcp_enabled }
data_network:
type: tosca.nodes.network.Network
properties:
ip_version: { get_input:
data_network_ip_version }
cidr: { get_input:
data_network_cidr }
|
G.1.1 Use Case: Exploring the HostedOn relationship
using WebApplication and WebServer
This use case examines the ways TOSCA YAML can be used to
express a simple hosting relationship (i.e., HostedOn)
using the normative TOSCA WebServer and
WebApplication node types defined in
this specification.
G.1.1.1 WebServer declares its “host” capability
For convenience, relevant parts of the normative
TOSCA Node Type for WebServer are shown below:
As can be seen, the WebServer
Node Type declares its capability to “contain” (i.e., host) other nodes using
the symbolic name “host” and providing the Capability Type tosca.capabilities.Container.
It should be noted that the symbolic name of “host” is not a reserved
word, but one assigned by the type designer that implies at or betokens the
associated capability. The Container capability
definition also includes a required list of valid Node Types that can be
contained by this, the WebServer, Node Type. This list is
declared using the keyname of valid_source_types and
in this case it includes only allowed type WebApplication.
G.1.1.2 WebApplication declares its “host”
requirement
The WebApplication
node type needs to be able to describe the type of capability a target node
would have to provide in order to “host” it. The normative TOSCA capability
type tosca.capabilities.Container is used to describe all normative TOSCA
hosting (i.e., container-containee pattern) relationships. As can be seen
below, the WebApplication accomplishes this by declaring a requirement with the
symbolic name “host” with the capability
keyname set to tosca.capabilities.Container.
Again, for convenience, the relevant parts of the
normative WebApplication Node Type are shown below:
G.1.1.2.1 Notes
·
The symbolic name “host” is not a keyword and was selected for
consistent use in TOSCA normative node types to give the reader an indication
of the type of requirement being referenced. A valid HostedOn relationship
could still be established between WebApplicaton and WebServer in a TOSCA
Service Template regardless of the symbolic name assigned to either the
requirement or capability declaration.
G.1.2 Use Case: Establishing a ConnectsTo
relationship to WebServer
This use case examines the ways TOSCA YAML can be used to
express a simple connection relationship (i.e., ConnectsTo) between some service
derived from the SoftwareComponent
Node Type, to the normative WebServer
node type defined in this specification.
The service template that would establish a ConnectsTo relationship as
follows:
|
node_types:
MyServiceType:
derived_from: SoftwareComponent
requirements:
# This type of service requires a connection to a WebServer’s data_endpoint
- connection1:
node: WebServer
relationship: ConnectsTo
capability: Endpoint
topology_template:
node_templates:
my_web_service:
type: MyServiceType
...
requirements:
- connection1:
node: my_web_server
my_web_server:
# Note, the normative WebServer node type declares the “data_endpoint”
# capability of type tosca.capabilities.Endpoint.
type: WebServer
|
Since the normative WebServer
Node Type only declares one capability of type tosca.capabilties.Endpoint
(or Endpoint, its alias in TOSCA) using the symbolic name data_endpoint,
the my_web_service node template does not need to declare that
symbolic name on its requirement declaration. If however, the my_web_server
node was based upon some other node type that declared more than one capability
of type Endpoint, then the capability
keyname could be used to supply the desired symbolic name if necessary.
G.1.2.1 Best practice
It should be noted that the best practice for
designing Node Types in TOSCA should not export two capabilities of the same
type if they truly offer different functionality (i.e., different capabilities)
which should be distinguished using different Capability Type definitions.
G.1.3 Use Case: Attaching
(local) BlockStorage to a Compute node
This use case examines the ways TOSCA YAML can be used to
express a simple AttachesTo relationship between a Compute node and a locally
attached BlockStorage node.
The service template that would establish an AttachesTo relationship follows:
|
node_templates:
my_server:
type: Compute
...
requirements:
# contextually this can only
be a relationship type
- local_storage:
# capability is provided by Compute Node Type
node:
my_block_storage
relationship:
type: AttachesTo
properties:
location:
/path1/path2
# This maps the local
requirement name ‘local_storage’ to the
# target node’s
capability name ‘attachment’
my_block_storage:
type: BlockStorage
properties:
size: 10 GB
|
G.1.4 Use
Case: Reusing a BlockStorage Relationship using Relationship Type or
Relationship Template
This builds upon the previous use case (G.1.3) to examine how a template author could attach multiple Compute nodes (templates) to the same
BlockStorage node (template), but with slightly different property values for
the AttachesTo relationship.
Specifically, several notation options are shown (in this
use case) that achieve the same desired result.
G.1.4.1 Simple Profile Rationale
Referencing an explicitly declared Relationship Template is
a convenience of the Simple Profile that allows template authors an entity to
set, constrain or override the properties and operations as defined in its
declared (Relationship) Type much as allowed now for Node Templates. It is
especially useful when a complex Relationship Type (with many configurable
properties or operations) has several logical occurrences in the same Service
(Topology) Template; allowing the author to avoid configuring these same
properties and operations in multiple Node Templates.
G.1.4.2 Notation Style #1: Augment AttachesTo
Relationship Type directly in each Node Template
This notation extends the methodology used for establishing
a HostedOn relationship, but allowing template author to supply (dynamic)
configuration and/or override of properties and operations.
Note: This option will remain valid for Simple
Profile regardless of other (following) notation (or aliasing) options being
discussed or adopted.
|
node_templates:
my_block_storage:
type: BlockStorage
properties:
size: 10
my_web_app_tier_1:
type: Compute
requirements:
- local_storage:
node: my_block_storage
relationship:
MyAttachesTo
# use default property
settings in the Relationship Type definition
my_web_app_tier_2:
type: Compute
requirements:
- local_storage:
node: my_block_storage
relationship:
type: MyAttachesTo
# Override default
property setting for just the ‘location’ property
properties:
location:
/some_other_data_location
relationship_types:
MyAttachesTo:
derived_from: AttachesTo
properties:
location: /default_location
interfaces:
Configure:
post_configure_target:
implementation: default_script.sh
|
G.1.4.3 Notation Style
#2: Use the ‘template’ keyword on the Node Templates to specify which named
Relationship Template to use
This option shows how to explicitly declare different named
Relationship Templates within the Service Template as part of a relationship_templates section (which have
different property values) and can be referenced by different Compute typed
Node Templates.
|
node_templates:
my_block_storage:
type: BlockStorage
properties:
size: 10
my_web_app_tier_1:
derived_from: Compute
requirements:
- attachment:
node: my_block_storage
relationship:
storage_attachesto_1
my_web_app_tier_2:
derived_from: Compute
requirements:
- attachment:
node: my_block_storage
relationship:
storage_attachesto_2
relationship_templates:
storage_attachesto_1:
type: MyAttachesTo
properties:
location: /my_data_location
storage_attachesto_2:
type: MyAttachesTo
properties:
location: /some_other_data_location
relationship_types:
MyAttachesTo:
derived_from: AttachesTo
interfaces:
some_interface_name:
some_operation:
implementation: default_script.sh
|
G.1.4.4 Notation Style #3: Using the “copy” keyname
to define a similar Relationship Template
How does TOSCA make it easier to create a new relationship
template that is mostly the same as one that exists without manually copying
all the same information? TOSCA provides the copy
keyname as a convenient way to copy an existing template definition into a new
template definition as a starting point or basis for describing a new
definition and avoid manual copy. The end results are cleaner TOSCA Service
Templates that allows the description of only the changes (or deltas) between
similar templates.
The example below shows that the Relationship
Template named storage_attachesto_1 provides some overrides
(conceptually a large set of overrides) on its Type which the Relationship
Template named storage_attachesto_2 wants to “copy”
before perhaps providing a smaller number of overrides.
|
node_templates:
my_block_storage:
type: BlockStorage
properties:
size: 10
my_web_app_tier_1:
derived_from: Compute
requirements:
- attachment:
node: my_block_storage
relationship:
storage_attachesto_1
my_web_app_tier_2:
derived_from: Compute
requirements:
- attachment:
node: my_block_storage
relationship:
storage_attachesto_2
relationship_templates:
storage_attachesto_1:
type: MyAttachesTo
properties:
location: /my_data_location
interfaces:
some_interface_name:
some_operation_name_1: my_script_1.sh
some_operation_name_2: my_script_2.sh
some_operation_name_3: my_script_3.sh
storage_attachesto_2:
# Copy the contents
of the “storage_attachesto_1” template into this new one
copy: storage_attachesto_1
# Then change just
the value of the location property
properties:
location: /some_other_data_location
relationship_types:
MyAttachesTo:
derived_from: AttachesTo
interfaces:
some_interface_name:
some_operation:
implementation: default_script.sh
|
Appendix H. Complete
Application Modeling Use Cases
H.1
Use cases
H.1.1 Overview
|
Use Case
|
|
Name
|
Description
|
Service Template link (Entry Definition)
|
|
Compute: Hosting
a Virtual Machine (VM) on a single Compute instance
|
Introduces a TOSCA Compute node
which is used to stand up a single instance of a Virtual Machine (VM) image.
|
TODO
|
|
BlockStorage-1:
Attaching Block Storage to a single Compute instance
|
Demonstrates how to attach a TOSCA BlockStorage node to a Compute node
using the normative AttachesTo relationship.
|
https://github.com/openstack/heat-translator/blob/master/translator/toscalib/tests/data/storage/tosca_blockstorage_with_attachment.yaml#L19
|
|
BlockStorage-2:
Attaching Block Storage using a custom Relationship Type
|
Demonstrates how to attach a TOSCA BlockStorage node to a Compute node
using a custom RelationshipType that derives from the normative AttachesTo relationship.
|
TODO
|
|
BlockStorage-3:
Using a Relationship Template of type AttachesTo
|
Demonstrates how to attach a TOSCA BlockStorage node to a Compute node
using a TOSCA Relationship Template that is based upon the normative AttachesTo Relationship Type.
|
TODO
|
|
BlockStorage-4:
Single Block Storage shared by 2-Tier Application with custom AttachesTo Type
and implied relationships
|
This use case shows 2 compute instances (2 tiers) with one
BlockStorage node, and also uses a custom AttachesTo
Relationship that provides a default mount point (i.e., location)
which the 1st tier uses, but the 2nd tier provides a
different mount point.
|
https://github.com/openstack/heat-translator/blob/master/translator/toscalib/tests/data/storage/tosca_blockstorage_with_attachment_notation1.yaml
|
|
BlockStorage-5:
Single Block Storage shared by 2-Tier Application with custom AttachesTo Type
and explicit Relationship Templates
|
This use case is like the previous BlockStorage-4 use
case, but also creates two relationship templates (one for each tier) each of
which provide a different mount point (i.e., location)
which overrides the default location defined in the custom Relationship Type.
|
https://github.com/openstack/heat-translator/blob/master/translator/toscalib/tests/data/storage/tosca_blockstorage_with_attachment_notation2.yaml
|
|
BlockStorage-6:
Multiple Block Storage attached to different Servers
|
This use case demonstrates how two different TOSCA BlockStorage nodes can be attached to two different Compute nodes (i.e., servers) each using the
normative AttachesTo relationship.
|
https://github.com/openstack/heat-translator/blob/master/translator/toscalib/tests/data/storage/tosca_multiple_blockstorage_with_attachment.yaml
|
|
Object Storage 1:
Creating an Object Storage service
|
Introduces the TOSCA ObjectStorage node type and shows how it can be instantiated.
|
https://github.com/openstack/heat-translator/blob/master/translator/toscalib/tests/data/storage/tosca_single_object_store.yaml
|
|
Network-1: Server
bound to a new network
|
Introduces the TOSCA Network and
Port nodes used for modeling logical networks
using the LinksTo and BindsTo Relationship
Types. In this use case, the template is invoked without an existing network_name as an input property so a new network is
created using the properties declared in the Network node.
|
https://github.com/openstack/heat-translator/blob/master/translator/toscalib/tests/data/network/tosca_one_server_one_network.yaml
|
|
Network-2: Server
bound to an existing network
|
Shows how to use a network_name as an input parameter to the template to allow a server to be
associated with (i.e. bound to) an existing Network.
|
https://github.com/openstack/heat-translator/blob/master/translator/toscalib/tests/data/network/tosca_server_on_existing_network.yaml
|
|
Network-3: Two
servers bound to a single network
|
This use case shows how two servers (Compute nodes) can be associated with the same Network node using two logical network Ports.
|
https://github.com/openstack/heat-translator/blob/master/translator/toscalib/tests/data/network/tosca_two_servers_one_network.yaml
|
|
Network-4: Server
bound to three networks
|
This use case shows how three logical networks (Network nodes),
each with its own IP address range, can be associated with the same server (Compute
node).
|
https://github.com/openstack/heat-translator/blob/master/translator/toscalib/tests/data/network/tosca_one_server_three_networks.yaml
|
|
WebServer-DBMS-1:
WordPress + MySQL, single instance
|
Shows how to host a TOSCA WebServer with a
TOSCA WebApplication, DBMS and
Database Node Types along with their dependent HostedOn and ConnectsTo
relationships.
|
https://github.com/openstack/heat-translator/blob/master/translator/toscalib/tests/data/tosca_single_instance_wordpress.yaml
|
|
WebServer-DBMS-2:
WordPress + MySQL + Floating IPs, single instance
|
Shows the WordPress
web application and MySQL database
nodes hosted on a single server (instance) along with demonstrating how to
create a network for the application with Floating IP addresses.
|
TODO
|
|
WebServer-DBMS-3:
Nodejs with PayPal Sample App and MongoDB on separate instances
|
Instantiates a 2-tier application with Nodejs
and its (PayPal sample) WebApplication on one tier which
connects a MongoDB database (which stores its application data) using a ConnectsTo
relationship.
|
https://github.com/openstack/heat-translator/blob/master/translator/toscalib/tests/data/tosca_nodejs_mongodb_two_instances.yaml
|
|
Multi-Tier-1:
Elasticsearch, Logstash, Kibana (ELK)
|
Shows Elasticsearch, Logstash
and Kibana (ELK) being used in a typical manner to
collect, search and monitor/visualize data from a running application.
This use case builds upon the previous Nodejs/MongoDB 2-tier application as the one being
monitored. The collectd and rsyslog components
are added to both the WebServer and Database tiers which work to collect data
for Logstash.
In addition to the application tiers, a 3rd
tier is introduced with Logstash
to collect data from the application tiers. Finally a 4th
tier is added to search the Logstash data with Elasticsearch and visualize it using Kibana.
Note: This use case also shows the
convenience of using a single YAML macro (declared in the dsl_definitions section
of the TOSCA Service Template) on multiple Compute nodes.
|
https://github.com/openstack/heat-translator/blob/master/translator/toscalib/tests/data/tosca_elk.yaml
|
|
Container-1:
Containers using Docker single Compute instance (Containers only)
|
Minimalist TOSCA Service Template description of 2 Docker
containers linked to each other. Specifically, one container runs wordpress
and connects to second mysql database container both on a single
server (i.e., Compute instance). The use case also demonstrates how TOSCA
declares and references Docker images from the Docker Hub repository.
Variation 1: Docker Container nodes (only) providing their Docker
Requirements allowing platform (orchestrator) to select/provide the
underlying Docker implementation (Capability).
|
TODO
|
H.1.2 Compute: Hosting a Virtual Machine (VM) on a
single instance
H.1.2.1 Description
This use case demonstrates how the TOSCA Simple Profile
specification can be used to stand up a single instance of a Virtual Machine
(VM) image using a normative TOSCA Compute
node. The TOSCA Compute node is declarative in that the service template
describes both the processor and host operating system platform characteristics
(i.e., properties declared on the capability named “os”) that are desired by the template
author. The cloud provider would attempt to fulfill these properties (to the
best of its abilities) during orchestration.
H.1.2.2 Features
This use case introduces the following TOSCA Simple Profile
features:
·
A node template that uses the normative TOSCA Compute
Node Type along with showing an exemplary set of its properties
being configured.
·
Use of the TOSCA Service Template inputs
section to declare a configurable value the template user may supply at
runtime. In this case, the “host” property named “num_cpus”
(of type integer) is declared.
o Use of a
property constraint to limit the allowed integer values for the “num_cpus”
property to a specific list supplied in the property declaration.
·
Use of the TOSCA Service Template outputs
section to declare a value the template user may request at runtime. In this
case, the property named “instance_ip” is
declared
o The “instance_ip”
output property is programmatically retrieved from the Compute
node’s “public_address” attribute using the TOSCA
Service Template-level get_attribute function.
H.1.2.3 Logical Diagram
H.1.2.4 Sample YAML
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile that just
defines a single compute instance. Note, this example does not include
default values on inputs properties.
topology_template:
inputs:
cpus:
type: integer
description: Number of CPUs
for the server.
constraints:
- valid_values: [ 1, 2, 4,
8 ]
node_templates:
my_server:
type: Compute
capabilities:
host:
properties:
disk_size: 10 GB
num_cpus: { get_input: cpus }
mem_size: 4 MB
os:
properties:
architecture:
x86_64
type:
Linux
distribution:
ubuntu
version:
12.04
outputs:
private_ip:
description: The private IP
address of the deployed server instance.
value: { get_attribute:
[my_server, private_address] }
|
H.1.2.5 Notes
·
This use case uses a versioned, Linux Ubuntu distribution on the
Compute node.
H.1.3 Block Storage
1: Using the normative AttachesTo Relationship Type
H.1.3.1 Description
This use case demonstrates how to attach a TOSCA BlockStorage
node to a Compute
node using the normative AttachesTo relationship.
H.1.3.2 Logical Diagram
H.1.3.3 Sample YAML
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile with server
and attached block storage using the normative AttachesTo Relationship Type.
topology_template:
inputs:
cpus:
type: integer
description: Number of CPUs
for the server.
constraints:
- valid_values: [ 1, 2, 4,
8 ]
storage_size:
type: scalar-unit.size
description: Size of the
storage to be created.
default: 1 GB
storage_snapshot_id:
type: string
description: >
Optional identifier for an
existing snapshot to use when creating storage.
storage_location:
type: string
description: Block storage
mount point (filesystem path).
node_templates:
my_server:
type: Compute
capabilities:
host:
properties:
disk_size: 10 GB
num_cpus: { get_input:
cpus }
mem_size: 4096 kB
os:
properties:
architecture: x86_64
type: linux
distribution: fedora
version: 18.0
requirements:
- attachment:
node: my_storage
relationship:
type: AttachesTo
properties:
location: {
get_input: storage_location }
my_storage:
type: BlockStorage
properties:
size: { get_input:
storage_size }
snapshot_id: { get_input:
storage_snapshot_id }
outputs:
private_ip:
description: The private IP
address of the newly created compute instance.
value: { get_attribute: [my_server,
private_address] }
volume_id:
description: The volume id
of the block storage instance.
value: { get_attribute: [my_storage,
volume_id] }
|
H.1.4 Block Storage
2: Using a custom AttachesTo Relationship Type
H.1.4.1 Description
This use case demonstrates how to attach a TOSCA BlockStorage
node to a Compute
node using a custom RelationshipType that derives from the normative AttachesTo
relationship.
H.1.4.2 Logical Diagram
H.1.4.3 Sample YAML
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile with server
and attached block storage using a custom AttachesTo Relationship Type.
relationship_types:
MyCustomAttachesTo:
derived_from: AttachesTo
topology_template:
inputs:
cpus:
type: integer
description: Number of CPUs
for the server.
constraints:
- valid_values: [ 1, 2, 4,
8 ]
storage_size:
type: scalar-unit.size
description: Size of the
storage to be created.
default: 1 GB
storage_snapshot_id:
type: string
description: >
Optional identifier for an
existing snapshot to use when creating storage.
storage_location:
type: string
description: Block storage
mount point (filesystem path).
node_templates:
my_server:
type: Compute
capabilities:
host:
properties:
disk_size: 10 GB
num_cpus: { get_input:
cpus }
mem_size: 4 MB
os:
properties:
architecture: x86_64
type: Linux
distribution: Fedora
version: 18.0
requirements:
- attachment:
node: storage
# Declare custom
AttachesTo type using the ‘relationship’ keyword
relationship:
type: MyCustomAttachesTo
properties:
location: { get_input:
storage_location }
my_storage:
type: BlockStorage
properties:
size: { get_input:
storage_size }
snapshot_id: { get_input:
storage_snapshot_id }
outputs:
private_ip:
description: The private IP
address of the newly created compute instance.
value: { get_attribute: [my_server,
private_address] }
volume_id:
description: The volume id
of the block storage instance.
value: { get_attribute: [my_storage,
volume_id] }
|
H.1.5 Block Storage
3: Using a Relationship Template of type AttachesTo
H.1.5.1 Description
This use case demonstrates how to attach a TOSCA BlockStorage
node to a Compute
node using a TOSCA Relationship Template that is based upon the normative AttachesTo
Relationship Type.
H.1.5.2 Logical Diagram
H.1.5.3 Sample YAML
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile with server
and attached block storage using a named Relationship Template for the
storage attachment.
topology_template:
inputs:
cpus:
type: integer
description: Number of CPUs
for the server.
constraints:
- valid_values: [ 1, 2, 4,
8 ]
storage_size:
type: scalar-unit.size
description: Size of the
storage to be created.
default: 1 GB
storage_location:
type: string
description: Block storage
mount point (filesystem path).
node_templates:
my_server:
type: Compute
capabilities:
host:
properties:
disk_size: 10 GB
num_cpus: { get_input:
cpus }
mem_size: 4 MB
os:
properties:
architecture: x86_64
type: Linux
distribution: Fedora
version: 18.0
requirements:
- local_storage:
node: storage
# Declare template to
use with ‘relationship’ keyword
relationship: storage_attachment
my_storage:
type: BlockStorage
properties:
size: { get_input:
storage_size }
relationship_templates:
storage_attachment:
type: AttachesTo
properties:
location: { get_input:
storage_location }
outputs:
private_ip:
description: The private IP
address of the newly created compute instance.
value: { get_attribute: [my_server,
private_address] }
volume_id:
description: The volume id of
the block storage instance.
value: { get_attribute: [my_storage,
volume_id] }
|
H.1.6 Block Storage 4: Single Block Storage
shared by 2-Tier Application with custom AttachesTo Type and implied
relationships
H.1.6.1 Description
This use case shows 2 compute instances (2 tiers) with one
BlockStorage node, and also uses a custom AttachesTo Relationship that provides a
default mount point (i.e., location) which the 1st tier
uses, but the 2nd tier provides a different mount point.
Please note that this use case assumes both Compute nodes
are accessing different directories within the shared, block storage node to
avoid collisions.
H.1.6.2 Logical Diagram
H.1.6.3 Sample YAML
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile with a Single
Block Storage node shared by 2-Tier Application with custom AttachesTo Type
and implied relationships.
relationship_types:
MyAttachesTo:
derived_from:
tosca.relationships.AttachesTo
properties:
location:
type: string
default: /default_location
topology_template:
inputs:
cpus:
type: integer
description: Number of CPUs
for the server.
constraints:
- valid_values: [ 1, 2, 4,
8 ]
storage_size:
type: scalar-unit.size
default: 1 GB
description: Size of the
storage to be created.
storage_snapshot_id:
type: string
description: >
Optional identifier for an
existing snapshot to use when creating storage.
node_templates:
my_web_app_tier_1:
type: tosca.nodes.Compute
capabilities:
host:
properties:
disk_size: 10 GB
num_cpus: { get_input:
cpus }
mem_size: 4096 MB
os:
properties:
architecture: x86_64
type: Linux
distribution: Fedora
version: 18.0
requirements:
- attachment:
node: my_storage
relationship: MyAttachesTo
my_web_app_tier_2:
type: tosca.nodes.Compute
capabilities:
host:
properties:
disk_size: 10 GB
num_cpus: { get_input:
cpus }
mem_size: 4096 MB
os:
properties:
architecture: x86_64
type: Linux
distribution: Fedora
version: 18.0
requirements:
- attachment:
node: my_storage
relationship:
type: MyAttachesTo
properties:
location:
/some_other_data_location
my_storage:
type:
tosca.nodes.BlockStorage
properties:
size: { get_input:
storage_size }
snapshot_id: { get_input:
storage_snapshot_id }
outputs:
private_ip_1:
description: The private IP
address of the application’s first tier.
value: { get_attribute: [my_web_app_tier_1,
private_address] }
private_ip_2:
description: The private IP
address of the application’s second tier.
value: { get_attribute: [my_web_app_tier_2,
private_address] }
volume_id:
description: The volume id
of the block storage instance.
value: { get_attribute: [my_storage,
volume_id] }
|
H.1.7 Block Storage 5: Single Block Storage
shared by 2-Tier Application with custom AttachesTo Type and explicit
Relationship Templates
H.1.7.1 Description
This use case is like the Notation1 use case, but also
creates two relationship templates (one for each tier) each of which provide a
different mount point (i.e., location) which overrides the default
location defined in the custom Relationship Type.
Please note that this use case assumes both Compute nodes
are accessing different directories within the shared, block storage node to
avoid collisions.
H.1.7.2 Logical Diagram
H.1.7.3 Sample YAML
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile with a single
Block Storage node shared by 2-Tier Application with custom AttachesTo Type
and explicit Relationship Templates.
relationship_types:
MyAttachesTo:
derived_from:
tosca.relationships.AttachesTo
properties:
location:
type: string
default: /default_location
topology_template:
inputs:
cpus:
type: integer
description: Number of CPUs
for the server.
constraints:
- valid_values: [ 1, 2, 4,
8 ]
storage_size:
type: scalar-unit.size
default: 1 GB
description: Size of the
storage to be created.
storage_snapshot_id:
type: string
description: >
Optional identifier for an
existing snapshot to use when creating storage.
storage_location:
type: string
description: >
Block storage mount point
(filesystem path).
node_templates:
my_web_app_tier_1:
type: tosca.nodes.Compute
capabilities:
host:
properties:
disk_size: 10 GB
num_cpus: { get_input:
cpus }
mem_size: 4096 kB
os:
properties:
architecture: x86_64
type: Linux
distribution: Fedora
version: 18.0
requirements:
- attachment:
node: my_storage
relationship:
storage_attachesto_1
my_web_app_tier_2:
type: tosca.nodes.Compute
capabilities:
host:
properties:
disk_size: 10 GB
num_cpus: { get_input:
cpus }
mem_size: 4096 kB
os:
properties:
architecture: x86_64
type: Linux
distribution: Fedora
version: 18.0
requirements:
- attachment:
node: my_storage
relationship:
storage_attachesto_2
my_storage:
type:
tosca.nodes.BlockStorage
properties:
size: { get_input:
storage_size }
snapshot_id: { get_input:
storage_snapshot_id }
relationship_templates:
storage_attachesto_1:
type: MyAttachesTo
properties:
location:
/my_data_location
storage_attachesto_2:
type: MyAttachesTo
properties:
location:
/some_other_data_location
outputs:
private_ip_1:
description: The private IP
address of the application’s first tier.
value: { get_attribute:
[my_web_app_tier_1, private_address] }
private_ip_2:
description: The private IP
address of the application’s second tier.
value: { get_attribute:
[my_web_app_tier_2, private_address] }
volume_id:
description: The volume id
of the block storage instance.
value: { get_attribute:
[my_storage, volume_id] }
|
H.1.8 Block Storage 6: Multiple Block Storage
attached to different Servers
H.1.8.1 Description
This use case demonstrates how two different TOSCA BlockStorage
nodes can be attached to two different Compute nodes (i.e., servers) each using
the normative AttachesTo
relationship.
H.1.8.2 Logical Diagram
H.1.8.3 Sample YAML
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile with 2 servers
each with different attached block storage.
topology_template:
inputs:
cpus:
type: integer
description: Number of CPUs
for the server.
constraints:
- valid_values: [ 1, 2, 4,
8 ]
storage_size:
type: scalar-unit.size
default: 1 GB
description: Size of the
storage to be created.
storage_snapshot_id:
type: string
description: >
Optional identifier for an
existing snapshot to use when creating storage.
storage_location:
type: string
description: >
Block storage mount point
(filesystem path).
node_templates:
my_server:
type: tosca.nodes.Compute
capabilities:
host:
properties:
disk_size: 10 GB
num_cpus: { get_input:
cpus }
mem_size: 4096 MB
os:
properties:
architecture: x86_64
type: Linux
distribution: Fedora
version: 18.0
requirements:
- attachment:
node: my_storage
relationship:
AttachesTo
properties:
location: {
get_input: storage_location }
my_storage:
type: tosca.nodes.BlockStorage
properties:
size: { get_input:
storage_size }
snapshot_id: { get_input:
storage_snapshot_id }
my_server2:
type: tosca.nodes.Compute
capabilities:
host:
properties:
disk_size: 10 GB
num_cpus: { get_input:
cpus }
mem_size: 4096 MB
os:
properties:
architecture: x86_64
type: Linux
distribution: Fedora
version: 18.0
requirements:
- attachment:
node: my_storage2
relationship:
AttachesTo
properties:
location: {
get_input: storage_location }
my_storage2:
type:
tosca.nodes.BlockStorage
properties:
size: { get_input:
storage_size }
snapshot_id: { get_input:
storage_snapshot_id }
outputs:
server_ip_1:
description: The private IP
address of the application’s first server.
value: { get_attribute: [my_server,
private_address] }
server_ip_2:
description: The private IP
address of the application’s second server.
value: { get_attribute: [my_server2,
private_address] }
volume_id_1:
description: The volume id
of the first block storage instance.
value: { get_attribute:
[my_storage, volume_id] }
volume_id_2:
description: The volume id
of the second block storage instance.
value: { get_attribute:
[my_storage2, volume_id] }
|
H.1.9 Object Storage 1: Creating an Object Storage
service
H.1.9.1 Description
H.1.9.2 Logical Diagram
H.1.9.3 Sample YAML
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
Tosca template for creating an
object storage service.
topology_template:
inputs:
objectstore_name:
type: string
node_templates:
obj_store_server:
type:
tosca.nodes.ObjectStorage
properties:
name: { get_input:
objectstore_name }
size: 1024 kB
maxsize: 1 GB
|
H.1.10 Network 1: Server bound to a new network
H.1.10.1 Description
Introduces the TOSCA Network and
Port nodes used for
modeling logical networks using the LinksTo and
BindsTo Relationship Types. In this use case, the
template is invoked without an existing network_name as an input property so a
new network is created using the properties declared in the Network node.
H.1.10.2 Logical Diagram
H.1.10.3 Sample YAML
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile with 1
server bound to a new network
topology_template:
inputs:
network_name:
type: string
description: Network name
node_templates:
my_server:
type: tosca.nodes.Compute
capabilities:
host:
properties:
disk_size: 10 GB
num_cpus: 1
mem_size: 512 MB
os:
properties:
architecture: x86_64
type: Linux
distribution: CirrOS
version: 0.3.2
my_network:
type:
tosca.nodes.network.Network
properties:
network_name: { get_input:
network_name }
ip_version: 4
cidr: '192.168.0.0/24'
start_ip: '192.168.0.50'
end_ip: '192.168.0.200'
gateway_ip: '192.168.0.1'
my_port:
type:
tosca.nodes.network.Port
requirements:
- binding: my_server
- link: my_network
|
H.1.11 Network 2: Server
bound to an existing network
H.1.11.1 Description
This use case shows how to use a network_name as an input parameter to the template to allow
a server to be associated with an existing network.
H.1.11.2 Logical Diagram
H.1.11.3 Sample YAML
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile with 1
server bound to an existing network
topology_template:
inputs:
network_name:
type: string
description: Network name
node_templates:
my_server:
type: tosca.nodes.Compute
properties:
disk_size: 10
num_cpus: 1
mem_size: 512
capabilities:
os:
properties:
architecture: x86_64
type: Linux
distribution: CirrOS
version: 0.3.2
my_network:
type:
tosca.nodes.network.Network
properties:
network_name: { get_input:
network_name }
my_port:
type:
tosca.nodes.network.Port
requirements:
- binding:
node: my_server
- link:
node: my_network
|
H.1.12 Network 3: Two
servers bound to a single network
H.1.12.1 Description
This use case shows how two servers (Compute nodes) can be bound to the same Network (node) using two logical network Ports.
H.1.12.2 Logical Diagram
H.1.12.3 Sample YAML
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile with 2
servers bound to the 1 network
topology_template:
inputs:
network_name:
type: string
description: Network name
network_cidr:
type: string
default: 10.0.0.0/24
description: CIDR for the
network
network_start_ip:
type: string
default: 10.0.0.100
description: Start IP for
the allocation pool
network_end_ip:
type: string
default: 10.0.0.150
description: End IP for the
allocation pool
node_templates:
my_server:
type: tosca.nodes.Compute
capabilities:
host:
properties:
disk_size: 10 GB
num_cpus: 1
mem_size: 512 MB
os:
properties:
architecture: x86_64
type: Linux
distribution: CirrOS
version: 0.3.2
my_server2:
type: tosca.nodes.Compute
capabilities:
host:
properties:
disk_size: 10 GB
num_cpus: 1
mem_size: 512 MB
os:
properties:
architecture: x86_64
type: Linux
distribution: CirrOS
version: 0.3.2
my_network:
type:
tosca.nodes.network.Network
properties:
ip_version: 4
cidr: { get_input:
network_cidr }
network_name: { get_input:
network_name }
start_ip: { get_input:
network_start_ip }
end_ip: { get_input:
network_end_ip }
my_port:
type:
tosca.nodes.network.Port
requirements:
- binding: my_server
- link: my_network
my_port2:
type:
tosca.nodes.network.Port
requirements:
- binding: my_server2
- link: my_network
|
H.1.13 Network 4: Server
bound to three networks
H.1.13.1 Description
This use case shows how three logical networks (Network),
each with its own IP address range, can be bound to with the same server
(Compute node).
H.1.13.2 Logical Diagram
H.1.13.3 Sample YAML
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile with 1
server bound to 3 networks
topology_template:
node_templates:
my_server:
type: tosca.nodes.Compute
capabilities:
host:
properties:
disk_size: 10 GB
num_cpus: 1
mem_size: 512 MB
os:
properties:
architecture: x86_64
type: Linux
distribution: CirrOS
version: 0.3.2
my_network1:
type:
tosca.nodes.network.Network
properties:
cidr: '192.168.1.0/24'
network_name: net1
my_network2:
type:
tosca.nodes.network.Network
properties:
cidr: '192.168.2.0/24'
network_name: net2
my_network3:
type:
tosca.nodes.network.Network
properties:
cidr: '192.168.3.0/24'
network_name: net3
my_port1:
type:
tosca.nodes.network.Port
properties:
order: 0
requirements:
- binding: my_server
- link: my_network1
my_port2:
type:
tosca.nodes.network.Port
properties:
order: 1
requirements:
- binding: my_server
- link: my_network2
my_port3:
type:
tosca.nodes.network.Port
properties:
order: 2
requirements:
- binding: my_server
- link: my_network3
|
H.1.14 WebServer-DBMS
1: WordPress + MySQL, single instance
H.1.14.1 Description
TOSCA simple profile service showing the WordPress web
application with a MySQL database hosted on a single server (instance).
H.1.14.2 Logical Diagram
H.1.14.3 Sample YAML
|
tosca_definitions_version: tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile with WordPress,
a web server, a MySQL DBMS hosting the application’s database content on the
same server. Does not have input defaults or constraints.
topology_template:
inputs:
cpus:
type: integer
description: Number of CPUs
for the server.
db_name:
type: string
description: The name of the
database.
db_user:
type: string
description: The username of
the DB user.
db_pwd:
type: string
description: The WordPress
database admin account password.
db_root_pwd:
type: string
description: Root password
for MySQL.
db_port:
type: PortDef
description: Port for the
MySQL database
node_templates:
wordpress:
type:
tosca.nodes.WebApplication.WordPress
properties:
context_root: { get_input:
context_root }
requirements:
- host: webserver
- database_endpoint:
mysql_database
interfaces:
Standard:
create: wordpress_install.sh
configure:
implementation: wordpress_configure.sh
inputs:
wp_db_name: {
get_property: [ mysql_database, name ] }
wp_db_user: {
get_property: [ mysql_database, user ] }
wp_db_password: {
get_property: [ mysql_database, password ] }
# In my own
template, find requirement/capability, find port property
wp_db_port: {
get_property: [ SELF, database_endpoint, port ] }
mysql_database:
type: Database
properties:
name: { get_input: db_name
}
user: { get_input: db_user
}
password: { get_input:
db_pwd }
port: { get_input: db_port
}
capabilities:
database_endpoint:
properties:
port: { get_input:
db_port }
requirements:
- host: mysql_dbms
interfaces:
Standard:
postconfigure: mysql_database_postconfigure.sh
mysql_dbms:
type: DBMS
properties:
root_password: {
get_input: db_root_pwd }
port: { get_input: db_port
}
requirements:
- host: server
interfaces:
Standard:
create: mysql_dbms_install.sh
start: mysql_dbms_start.sh
configure:
implementation:
mysql_dbms_configure.sh
inputs:
db_root_password: {
get_property: [ mysql_dbms, root_password ] }
webserver:
type: WebServer
requirements:
- host: server
interfaces:
Standard:
create: webserver_install.sh
start: webserver_start.sh
server:
type: Compute
capabilities:
host:
properties:
disk_size: 10 GB
num_cpus: { get_input:
cpus }
mem_size: 4096 kB
os:
properties:
architecture: x86_64
type: linux
distribution: fedora
version: 17.0
outputs:
website_url:
description: URL for
Wordpress wiki.
value: { get_attribute:
[server, public_address] }
|
H.1.14.4 Sample scripts
Where the referenced implementation scripts in the
example above would have the following contents
H.1.14.4.1 wordpress_install.sh
H.1.14.4.2 wordpress_configure.sh
|
sed -i "/Deny from
All/d" /etc/httpd/conf.d/wordpress.conf
sed -i "s/Require
local/Require all granted/" /etc/httpd/conf.d/wordpress.conf
sed -i s/database_name_here/name/
/etc/wordpress/wp-config.php
sed -i s/username_here/user/
/etc/wordpress/wp-config.php
sed -i s/password_here/password/
/etc/wordpress/wp-config.php
systemctl restart httpd.service
|
H.1.14.4.3 mysql_database_postconfigure.sh
|
# Setup MySQL root password and
create user
cat << EOF | mysql -u root
--password=db_root_password
CREATE DATABASE name;
GRANT ALL PRIVILEGES ON name.* TO
"user"@"localhost"
IDENTIFIED BY "password";
FLUSH PRIVILEGES;
EXIT
EOF
|
H.1.14.4.4 mysql_dbms_install.sh
|
yum -y install mysql mysql-server
# Use systemd to start MySQL
server at system boot time
systemctl enable mysqld.service
|
H.1.14.4.5 mysql_dbms_start.sh
|
# Start the MySQL service (NOTE:
may already be started at image boot time)
systemctl start mysqld.service
|
H.1.14.4.6 mysql_dbms_configure
|
# Set the MySQL server root
password
mysqladmin -u root password
db_root_password
|
H.1.14.4.7 webserver_install.sh
|
yum -y install httpd
systemctl enable httpd.service
|
H.1.14.4.8 webserver_start.sh
|
# Start the httpd service (NOTE:
may already be started at image boot time)
systemctl start httpd.service
|
H.1.15 WebServer-DBMS 2: WordPress + MySQL +
Floating IPs, single instance
H.1.15.1 Description
This use case is based upon OpenStack Heat’s Cloud Formation
(CFN) template:
·
https://github.com/openstack/heat-templates/blob/master/cfn/F17/WordPress_Single_Instance_With_EIP.template
Note: Future drafts of this specification
will detail this use case.
H.1.15.2 Logical Diagram
TBD
H.1.15.3 Sample YAML
H.1.15.4 Notes
·
The Heat/CFN use case also introduces the concept of “Elastic IP”
(EIP) addresses which is the Amazon AWS term for floating IPs.
·
The Heat/CFN use case provides a “key_name” as input which we
will not attempt to show in this use case as this is a future
security/credential topic.
·
The Heat/CFN use case assumes that the “image” uses the “yum”
installer to install Apache, MySQL and Wordpress and installs, starts and configures
them all in one script (i.e., under Compute). In TOSCA we represent each of
these software components as their own Nodes each with independent scripts.
H.1.16 WebServer-DBMS 3: Nodejs with PayPal Sample
App and MongoDB on separate instances
H.1.16.1 Description
This use case Instantiates a 2-tier application with Nodejs
and its (PayPal sample) WebApplication on one tier which connects a MongoDB
database (which stores its application data) using a ConnectsTo relationship.
H.1.16.2 Logical Diagram
H.1.16.3 Sample YAML
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile with a nodejs
web server hosting a PayPal sample application which connects to a mongodb
database.
imports:
- custom_types/paypalpizzastore_nodejs_app.yaml
dsl_definitions:
ubuntu_node: &ubuntu_node
disk_size: 10 GB
num_cpus: { get_input:
my_cpus }
mem_size: 4096 MB
os_capabilities:
&os_capabilities
architecture: x86_64
type: Linux
distribution: Ubuntu
version: 14.04
topology_template:
inputs:
my_cpus:
type: integer
description: Number of CPUs
for the server.
constraints:
- valid_values: [ 1, 2, 4,
8 ]
default: 1
github_url:
type: string
description: The URL to
download nodejs.
default:
https://github.com/sample.git
node_templates:
paypal_pizzastore:
type:
tosca.nodes.WebApplication.PayPalPizzaStore
properties:
github_url: { get_input:
github_url }
requirements:
- host:nodejs
- database_connection:
mongo_db
interfaces:
Standard:
configure:
implementation: scripts/nodejs/configure.sh
inputs:
github_url: {
get_property: [ SELF, github_url ] }
mongodb_ip: {
get_attribute: [mongo_server, private_address] }
start: scripts/nodejs/start.sh
nodejs:
type: tosca.nodes.WebServer.Nodejs
requirements:
- host: app_server
interfaces:
Standard:
create: Scripts/nodejs/create.sh
mongo_db:
type: tosca.nodes.Database
requirements:
- host: mongo_dbms
interfaces:
Standard:
create:
create_database.sh
mongo_dbms:
type: tosca.nodes.DBMS
requirements:
- host: mongo_server
properties:
port: 27017
interfaces:
tosca.interfaces.node.lifecycle.Standard:
create:
mongodb/create.sh
configure:
implementation:
mongodb/config.sh
inputs:
mongodb_ip: {
get_attribute: [mongo_server, private_address] }
start: mongodb/start.sh
mongo_server:
type: tosca.nodes.Compute
capabilities:
os:
properties:
*os_capabilities
host:
properties: *ubuntu_node
app_server:
type: tosca.nodes.Compute
capabilities:
os:
properties:
*os_capabilities
host:
properties: *ubuntu_node
outputs:
nodejs_url:
description: URL for the
nodejs server, http://<IP>:3000
value: { get_attribute:
[app_server, private_address] }
mongodb_url:
description: URL for the
mongodb server.
value: { get_attribute: [
mongo_server, private_address ] }
|
H.1.16.4 Notes:
·
Scripts referenced in this example are assumed to be placed by
the TOSCA orchestrator in the relative directory declared in TOSCA.meta of the
TOSCA CSAR file.
H.1.17 Multi-Tier-1: Elasticsearch, Logstash, Kibana
(ELK) use case with multiple instances
H.1.17.1 Description
TOSCA simple profile service showing the Nodejs, MongoDB, Elasticsearch,
Logstash, Kibana, rsyslog and collectd installed on a different server
(instance).
This use case also demonstrates:
·
Use of TOSCA macros or dsl_definitions
·
Multiple SoftwareComponents hosted on same
Compute node
·
Multiple tiers communicating to each other over ConnectsTo using
Configure interface.
H.1.17.2 Logical Diagram
H.1.17.3 Master Service Template application
(Entry-Definitions)
TBD
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
This TOSCA simple profile
deployes nodejs, mongodb, elasticsearch, logstash and kibana each on a
separate server with monitoring enabled for nodejs server where a sample
nodejs application is running. The syslog and collectd are installed on a
nodejs server.
imports:
-
paypalpizzastore_nodejs_app.yaml
- elasticsearch.yaml
- logstash.yaml
- kibana.yaml
- collectd.yaml
- rsyslog.yaml
dsl_definitions:
host_capabilities:
&host_capabilities
# container properties
(flavor)
disk_size: 10 GB
num_cpus: { get_input:
my_cpus }
mem_size: 4096 MB
os_capabilities:
&os_capabilities
architecture: x86_64
type: Linux
distribution: Ubuntu
version: 14.04
topology_template:
inputs:
my_cpus:
type: integer
description: Number of CPUs
for the server.
constraints:
- valid_values: [ 1, 2, 4,
8 ]
github_url:
type: string
description: The URL to
download nodejs.
default:
https://github.com/sample.git
node_templates:
paypal_pizzastore:
type:
tosca.nodes.WebApplication.PayPalPizzaStore
properties:
github_url: { get_input:
github_url }
requirements:
- host: nodejs
- database_connection: mongo_db
interfaces:
Standard:
configure:
implementation: scripts/nodejs/configure.sh
inputs:
github_url: {
get_property: [ SELF, github_url ] }
mongodb_ip: {
get_attribute: [mongo_server, private_address] }
start: Sripts/nodejs/start.sh
nodejs:
type: tosca.nodes.WebServer.Nodejs
requirements:
- host: app_server
interfaces:
Standard:
create: Scripts/nodejs/create.sh
mongo_db:
type: tosca.nodes.Database
requirements:
- host: mongo_dbms
interfaces:
Standard:
create:
create_database.sh
mongo_dbms:
type: tosca.nodes.DBMS
requirements:
- host: mongo_server
interfaces:
tosca.interfaces.node.lifecycle.Standard:
create:
Scripts/mongodb/create.sh
configure:
implementation:
Scripts/mongodb/config.sh
inputs:
mongodb_ip: {
get_attribute: [mongo_server, ip_address] }
start: Scripts/mongodb/start.sh
elasticsearch:
type:
tosca.nodes.SoftwareComponent.Elasticsearch
requirements:
- host:
elasticsearch_server
interfaces:
tosca.interfaces.node.lifecycle.Standard:
create: Scripts/elasticsearch/create.sh
start: Scripts/elasticsearch/start.sh
logstash:
type:
tosca.nodes.SoftwareComponent.Logstash
requirements:
- host: logstash_server
- search_endpoint:
elasticsearch
interfaces:
tosca.interfaces.relationship.Configure:
pre_configure_source:
implementation:
Python/logstash/configure_elasticsearch.py
input:
elasticsearch_ip: { get_attribute: [elasticsearch_server, ip_address] }
interfaces:
tosca.interfaces.node.lifecycle.Standard:
create:
Scripts/lostash/create.sh
configure:
Scripts/logstash/config.sh
start:
Scripts/logstash/start.sh
kibana:
type:
tosca.nodes.SoftwareComponent.Kibana
requirements:
- host: kibana_server
- search_endpoint:
elasticsearch
interfaces:
tosca.interfaces.node.lifecycle.Standard:
create:
Scripts/kibana/create.sh
configure:
implementation:
Scripts/kibana/config.sh
input:
elasticsearch_ip: {
get_attribute: [elasticsearch_server, ip_address] }
kibana_ip: {
get_attribute: [kibana_server, ip_address] }
start:
Scripts/kibana/start.sh
app_collectd:
type:
tosca.nodes.SoftwareComponent.Collectd
requirements:
- host: app_server
- collectd_endpoint:
logstash
interfaces:
tosca.interfaces.relationship.Configure:
pre_configure_target:
implementation:
Python/logstash/configure_collectd.py
interfaces:
tosca.interfaces.node.lifecycle.Standard:
create:
Scripts/collectd/create.sh
configure:
implementation:
Python/collectd/config.py
input:
logstash_ip: {
get_attribute: [logstash_server, ip_address] }
start:
Scripts/collectd/start.sh
app_rsyslog:
type:
tosca.nodes.SoftwareComponent.Rsyslog
requirements:
- host: app_server
- rsyslog_endpoint:
logstash
interfaces:
tosca.interfaces.relationship.Configure:
pre_configure_target:
implementation:
Python/logstash/configure_rsyslog.py
interfaces:
tosca.interfaces.node.lifecycle.Standard:
create:
Scripts/rsyslog/create.sh
configure:
implementation:
Scripts/rsyslog/config.sh
input:
logstash_ip: {
get_attribute: [logstash_server, ip_address] }
start:
Scripts/rsyslog/start.sh
app_server:
type: tosca.nodes.Compute
capabilities:
host:
properties:
*host_capabilities
os:
properties:
*os_capabilities
mongo_server:
type: tosca.nodes.Compute
capabilities:
host:
properties:
*host_capabilities
os:
properties:
*os_capabilities
elasticsearch_server:
type: tosca.nodes.Compute
capabilities:
host:
properties:
*host_capabilities
os:
properties:
*os_capabilities
logstash_server:
type: tosca.nodes.Compute
capabilities:
host:
properties:
*host_capabilities
os:
properties: *os_capabilities
kibana_server:
type: tosca.nodes.Compute
capabilities:
host:
properties:
*host_capabilities
os:
properties:
*os_capabilities
outputs:
nodejs_url:
description: URL for the
nodejs server.
value: { get_attribute: [
app_server, private_address ] }
mongodb_url:
description: URL for the
mongodb server.
value: { get_attribute: [
mongo_server, private_address ] }
elasticsearch_url:
description: URL for the
elasticsearch server.
value: { get_attribute: [
elasticsearch_server, private_address ] }
logstash_url:
description: URL for the
logstash server.
value: { get_attribute: [
logstash_server, private_address ] }
kibana_url:
description: URL for the
kibana server.
value: { get_attribute: [ kibana_server, private_address ] }
|
H.1.17.4 Sample scripts
Where the referenced implementation scripts in the
example above would have the following contents
H.1.18 Container-1: Containers using Docker single
Compute instance (Containers only)
H.1.18.1.1 Description
This use case shows a minimal description of two Container
nodes (only) providing their Docker Requirements allowing platform
(orchestrator) to select/provide the underlying Docker implementation (Capability).
Specifically, wordpress and mysql Docker images are referenced from Docker Hub.
This use case also demonstrates:
·
Abstract description of Requirements (i.e., Container and Docker)
allowing platform to dynamically select the appropriate runtime Capabilities
that match.
·
Use of external repository (Docker Hub) to reference image
artifact.
H.1.18.2 Logical Diagram
TBD
H.1.18.3 Sample YAML
H.1.18.3.1 G1.8.3.1 Two Docker “Container” nodes
(Only) with Docker Requirements
|
tosca_definitions_version:
tosca_simple_yaml_1_0_0
description: >
TOSCA simple profile with
wordpress, web server and mysql on the same server.
inputs:
wp_host_port:
type: integer
description: The host port
that maps to port 80 of the WordPress container.
db_root_pwd:
type: string
description: Root password for
MySQL.
# Repositories to retrieve code
artifacts from
repositories:
docker_hub:
https://registry.hub.docker.com/
topology_template:
node_templates:
# The MYSQL container based on
official MySQL image in Docker hub
mysql_container:
type: tosca.nodes.Container.Application.Docker
capabilities:
database_endpoint:
tosca.capabilities.Endpoint.Database
artifacts:
- my_image: mysql
type: tosca.artifacts.Deployment.Image.Container.Docker
repository: docker_hub
interfaces:
tosca.interfaces.node.lifecycle.Standard:
create:
implementation:
my_image
inputs:
db_root_password: {
get_input: db_root_pwd }
# The WordPress container
based on official WordPress image in Docker hub
wordpress_container:
type: tosca.nodes.Container.Application.Docker
requirements:
- database_endpoint:
mysql_container
artifacts:
- my_image: wordpress
type: tosca.artifacts.Deployment.Image.Container.Docker
repository: docker_hub
interfaces:
tosca.interfaces.node.lifecycle.Standard:
create:
implementation:
my_image
inputs:
host_port: {
get_input: wp_host_port }
|
I.1 Types of policies
Policies typically address two major areas of concern for
customer workloads:
·
Assure governance and compliance with industry and company
policies and regulations.
·
Assure Quality-of-Service and continuity/SLA
I.1.1 SLA policy concerns
·
Affinity/Anti-affinity: of deployed workloads; that is, what code
is allowed to be placed where
·
Performance (scalability): What resources are an application
allowed to consume and
I.1.2 Governance policy concerns
·
In addition to deploying to a Cloud platform and using a
pattern-based approach, customers concerns over “loss of control” are
increased. There must be control mechanisms in place that accept governance
policies.
I.1.3 Rules considerations
·
Natural language rules are not realistic, too much to represent
in our specification; however, regular expressions can be used that include
simple operations and operands that include symbolic names for TOSCA metamodel
entities, properties and attributes.
·
Complex rules can actually be directed to an external policy
engine (to check for violation) returns true|false then policy says what to do
(trigger or action).
·
Actions/Triggers could be:
·
Autonomic/Platform corrects against user-supplied criteria
·
External monitoring service could be utilized to monitor policy
rules/conditions against metrics, the monitoring service could coordinate
corrective actions with external services (perhaps Workflow engines that can
analyze the application and interact with the TOSCA instance model).
I.1.4 Definition:
Policies are used to convey a set of capabilities,
requirements and general characteristics of an entity.
I.1.5 Policy (Combined requirement)
Work-in-progress:
|
- name: “my policy”
- type: TBD # cataegories:
affinity (anti-affinity), scaling, performance
|
I.1.6 Requirement (Assertion) Group (grouping
construct)
|
- “ignorable” | “best can” | “all”
- “choice” (e.g., “one of”)
|
I.1.7 Policy Requirement (Assertions)
Use case: Compute1 and Compute2 are 2 node templates.
Compute1 has 10 instances, 5 in one region 5 in other region
|
# ----- affinity example
----------
- name: MyAntiAffinityPolicy
- type: tosca.policy.affinity.
- rule: fn.separate [ Compute1,
Compute2 ] # implies stack-level control
- trigger: <script>
# ---scaling example ----
- name: MyScaleUpPolicy
- type: tosca.policy.scale.up |
tosca.policy.scale.down
- rule: fn.utilizaton [ Compute1,
Compute2 ], greater_than: 80%
- trigger: <script>
|
J.1
Known Extensions to TOSCA v1.0
The following items will need to be reflected in the TOSCA
(XML) specification to allow for isomorphic mapping between the XML and YAML
service templates.
J.1.1 Model Changes
·
The “TOSCA Simple ‘Hello World’” example introduces this concept
in Section 3. Specifically, a
VM image assumed to accessible by the cloud provider.
·
Introduce template Input and Output parameters
·
The “Template with input and output parameter” example introduces
concept in Section 3.1.
·
“Inputs” could be mapped to BoundaryDefinitions in TOSCA v1.0.
Maybe needs some usability enhancement and better description.
·
“outputs” are a new feature.
·
Grouping of Node Templates
·
This was part of original TOSCA proposal, but removed early on
from v1.0 This allows grouping of node templates that have some type of
logically managed together as a group (perhaps to apply a scaling or placement
policy).
·
Lifecycle Operation definition independent/separate from Node
Types or Relationship types (allows reuse). For now we added definitions for
“node.lifecycle” and “relationship.lifecycle”.
·
Override of Interfaces (operations) in the Node Template.
·
Service Template Naming/Versioning
·
Should include TOSCA spec. (or profile) version number (as part
of namespace)
·
Allow the referencing artifacts using a URL (e.g., as a property
value).
·
Repository definitions in Service Template.
·
Substitution mappings for Topology template.
J.1.2 Normative Types
·
Constraints
·
constraint clauses, regex
·
Types / Property / Parameters
·
list, map, range, scalar-unit types
·
Includes YAML intrinsic types
·
NetworkInfo, PortInfo, PortDef, PortSpec, Credential
·
TOSCA Version based on Maven
·
Node
·
Root, Compute, ObjectStorage, BlockStorage, Network, Port,
SoftwareComponent, WebServer, WebApplicaton, DBMS, Database, Container, and
others
·
Relationship
·
Root, DependsOn, HostedOn, ConnectsTo, AttachesTo, RoutesTo,
BindsTo, LinksTo and others
·
Artifact
·
Deployment: Image Types (e.g., VM, Container), ZIP, TAR, etc.
·
Implementation: File, Bash, Python, etc.
·
Requirements
·
None
·
Capabilities
·
Container, Endpoint, Attachment, Scalable, …
·
Lifecycle
·
Standard (for Node Types)
·
Configure (for Relationship Types)
·
Functions
·
get_input, get_attribute, get_property, get_nodes_of_type,
get_operation_output and others
·
concat, token
·
get_artifact
J.2 Terminology
The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL
NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” in this
document are to be interpreted as described in
|
[TOSCA-1.0]
|
Topology and
Orchestration Topology and Orchestration Specification for Cloud Applications
(TOSCA) Version 1.0, an OASIS Standard, 25 November 2013, http://docs.oasis-open.org/tosca/TOSCA/v1.0/os/TOSCA-v1.0-os.pdf
|
|
[YAML-1.2]
|
YAML, Version 1.2, 3rd
Edition, Patched at 2009-10-01, Oren Ben-Kiki, Clark Evans, Ingy döt Net http://www.yaml.org/spec/1.2/spec.html
|
|
[YAML-TS-1.1]
|
Timestamp
Language-Independent Type for YAML Version 1.1, Working Draft 2005-01-18, http://yaml.org/type/timestamp.html
|
.
J.3 Normative References
|
[TOSCA-1.0]
|
Topology and
Orchestration Topology and Orchestration Specification for Cloud Applications
(TOSCA) Version 1.0, an OASIS Standard, 25 November 2013, http://docs.oasis-open.org/tosca/TOSCA/v1.0/os/TOSCA-v1.0-os.pdf
|
|
[YAML-1.2]
|
YAML, Version 1.2, 3rd
Edition, Patched at 2009-10-01, Oren Ben-Kiki, Clark Evans, Ingy döt Net http://www.yaml.org/spec/1.2/spec.html
|
|
[YAML-TS-1.1]
|
Timestamp
Language-Independent Type for YAML Version 1.1, Working Draft 2005-01-18, http://yaml.org/type/timestamp.html
|
J.4
Non-Normative References
J.5 Glossary
The following terms are used throughout this
specification and have the following definitions when used in context of this
document.
|
Term
|
Definition
|
|
Instance
Model
|
A deployed service is a running
instance of a Service Template. More precisely, the instance is derived by
instantiating the Topology Template of its Service Template, most often by
running a special plan defined for the Service Template, often referred to as
build plan.
|
|
Node
Template
|
A Relationship Template specifies
the occurrence of a software component node as part of a Topology Template.
Each Node Template refers to a Node Type that defines the semantics of the
node (e.g., properties, attributes, requirements, capabilities, interfaces).
Node Types are defined separately for reuse purposes.
|
|
Relationship
Template
|
A Relationship Template specifies
the occurrence of a relationship between nodes in a Topology Template. Each
Relationship Template refers to a Relationship Type that defines the
semantics relationship (e.g., properties, attributes, interfaces, etc.).
Relationship Types are defined separately for reuse purposes.
|
|
Service Template
|
A Service Template is typically used to specify the “topology”
(or structure) and “orchestration” (or invocation of management behavior) of
IT services so that they can be provisioned and managed in accordance with
constraints and policies.
Specifically, TOSCA Service Templates optionally allow
definitions of a TOSCA Topology Template
, TOSCA types (e.g., Node, Relationship, Capability, Artifact, etc.),
groupings, policies and constraints along with any input or output
declarations.
|
|
Topology Model
|
The term Topology Model is often used synonymously with the term
Topology Template with the use of
“model” being prevalent when considering a Service Template’s topology
definition as an abstract representation of an
application or service to facilitate understanding of its functional
components and by eliminating unnecessary details.
|
|
Topology Template
|
A Topology Template defines the structure of a service in the
context of a Service Template. A Topology Template consists of a set of Node
Template and Relationship Template definitions that together define the
topology model of a service as a (not necessarily connected) directed graph.
The term Topology Template is often used synonymously with the
term Topology Model. The distinction is
that a topology template can be used to instantiate and orchestrate the model
as a reusable pattern and includes all details necessary to
accomplish it.
|
|
|
|
|
Issue #
|
Target
|
Status
|
Owner
|
Title
|
Notes
|
|
TOSCA-132
|
CSD05
|
Defer
|
Palma
|
Use "set_property" methods to "push"
values from template inputs to nodes
|
Feature. Needs new owner.
|
|
TOSCA-135
|
CSD04
|
Open
|
Palma
|
Define/reference a Regex language (or subset) we wish to
support for constraints
|
Feature, Reference a Perl subset.
|
|
TOSCA-136
|
CSD04
|
Open
|
Zala
|
Need rules to assure non-collision (uniqueness) of
requirement or capability names
|
None
|
|
TOSCA-137
|
CSD05
|
Defer
|
Palma
|
Need to address "optional" and "best
can" on node requirements (constraints) for matching/resolution
|
|
|
TOSCA-138
|
CSD05
|
Defer
|
Palma
|
Define a Network topology for L2 Networks along with
support for Gateways, Subnets, Floating IPs and Routers
|
Luc Boutier has rough proposal in MS Word format.
|
|
TOSCA-140
|
CSD04
|
Open
|
Palma
|
Constraining
the capabilities of multiple node templates
|
|
|
TOSCA-141
|
CSD04
|
Open
|
Palma
|
Specifying
Environment Constraints for Node Templates (Policy related)
|
|
|
TOSCA-142
|
CSD03
|
Open
Fixed
|
Spatzier / Rutkowski
|
Define normative Artifact Types (including
deployment/packages, impls., and runtime types)
|
|
|
TOSCA-143
|
CSD03
|
Open
Fixed
|
Rutkowski
|
Define normative tosca.nodes.Network Node Type (for simple
networks)
|
Separate use case as what Luc proposes in TOSCA-138.
|
|
TOSCA-148
|
CSD03
|
Open
Fixed
|
Palma
|
Need a means to express cardinality on relationships
(e.g., number of connections allowed)
|
Occurrences now on capability and requirement defs.
|
|
TOSCA-151
|
CSD04
|
Defer
|
Rutkowski
|
Resolve spec. behavior if name collisions occur on named
Requirements
|
subtask of TOSCA-148
|
|
TOSCA-152
|
CSD05
|
Defer
|
Palma
|
Extend Requirement grammar to support "Optional/Best
Can" Capability Type matching
|
subtask of TOSCA-137
|
|
TOSCA-153
|
CSD04
|
Open
|
Rutkowski
|
Define grammar and usage of Service Template keyname
(schema namespace) "tosca_default_namespace"
|
|
|
TOSCA-154
|
CSD05
|
Defer
|
Palma
|
Decide how security/access control work with Nodes, update
grammar, author descriptive text/examples
|
Deferred
|
|
TOSCA-155
|
CSD05
|
Defer
|
Rutkowski
|
How do we provide constraints on properties declared as
simple YAML lists (sets)
|
Deferred
|
|
TOSCA-156
|
CSD05
|
Defer
|
Palma
|
Are there IPv6 considerations (e.g., new properties) for
tosca.capabilities.Endpoint
|
Deferred
|
|
TOSCA-158
|
CSD05
|
Defer
|
|
Provide prose describing how Feature matching is done by
orchestrators
|
Deferred.
Subtask of TOSCA-137
|
|
TOSCA-161
|
CSD03
|
FIXED
|
Spatzier
|
Need examples of using the built-in feature (Capability)
and dependency (Requirement) of tosca.nodes.Root
|
Deferred; however the Root node was fixed and the Root
capability type was added
|
|
TOSCA-162
|
CSD05
|
Defer
|
Rutkowski
|
Provide recognized values for tosca.nodes.compute
properties: os_arch
|
Deferred
|
|
TOSCA-163
|
CSD05
|
Defer
|
Vachnis
|
Provide recognized values for tosca.nodes.BlockStorage:
store_fs_type
|
Deferred
|
|
TOSCA-165
|
CSD05
|
Defer
|
Need new owner
|
New use case / example: Selection/Replacement of web
server type (e.g. Apache, NGinx, Lighttpd, etc.)
|
Deferred
|
|
TOSCA-166
|
CSD05
|
Defer
|
Unassigned
|
New use case / example: Web Server with (one or more)
runtimes environments (e.g., PHP, Java, etc.)
|
Deferred
|
|
TOSCA-167
|
CSD05
|
Defer
|
Unassigned
|
New use case / example: Show abstract substitution of
Compute node OS with different Node Type Impls.
|
Deferred
|
|
TOSCA-168
|
CSD06
|
Defer
|
Unassigned
|
New use case / example: Show how substitution of IaaS can
be accomplished.
|
Deferred
|
|
TOSCA-170
|
CSD05
|
Defer
|
Elisha
|
WD02 - Explicit textual mention, and grammar support, for
adding (extending) node operations
|
Deferred
|
|
TOSCA-172
|
CSD05
|
Defer
|
Lipton
|
2014 March - Public Comment Questions (Plans, Instance
Counts, and linking SW Nodes)
|
Deferred
|
|
TOSCA-176
|
CSD03
|
Fixed
|
Elisha
|
Add connectivity ability to Compute
|
Deferred. However, we added Endpoint.Admin to Compute.
This is intended for SSH (using ConnectsTo)
|
|
TOSCA-179
|
CSD03
|
Defer
CLOSE
|
Elisha
|
Add "timeout" and "retry" keynames to
an operation
|
Deferred. However, we do NOT intend to have TOSCA define
how “retry” on connections should be implemented. Recommend Close.
|
|
TOSCA-180
|
CSD02
|
Open / In-progress
FIXED
|
Rutkowski
|
Support of secured repositories for artifacts
|
Repository support added.
|
|
TOSCA-181
|
CSD03
|
Open
FIXED
|
Boutier
|
Dependency requirement type should match any target node.
|
Subtask of TOSCA-161
161 is fixed and now any node derived from Root node can
require any other node also derived from Root
|
|
TOSCA-182
|
CSD04
|
Defer
|
Palma
|
Document
parsing conventions
|
Deferred
|
|
TOSCA-183
|
CSD04
|
Open
|
Palma
|
Composition
across multiple yaml documents
|
Deferred
|
|
TOSCA-184
|
CSD05
|
Defer
|
Palma
|
Pushing
(vs pulling) inputs to templates
|
Subtask of TOSCA-132, Deferred
|
|
TOSCA-185
|
CSD05
|
Defer
|
Durand
|
Instance
model
|
Deferred
|
|
TOSCA-186
|
CSD04
|
Defer
|
Spatzier
|
model
composition
|
Deferred
|
|
TOSCA-189
|
CSD03
|
Open
|
Shtilman
|
Application
Monitoring - Proposal
|
Monitoring WG should use as a use case / discussion
|
|
TOSCA-191
|
CSD03
|
Open
Fixed
|
Rutkowski
|
Document
the “augmentation” behavior after relationship is selected in a requirement
|
|
|
TOSCA-193
|
CSD04
|
Open
Review
|
Spatzier
|
“implements” keyword needs its own section/grammar/example
in A.5.2
|
Subtask of TOSCA-186
See if we can close this as much as been fixed, but
perhaps a small feature remains and deserces its own isuee
|
|
TOSCA-194
|
CSD02
|
Open
Review
|
Lauwers
|
Nested Service Templates should be able to define
additional operations
|
Subtask of TOSCA-186
|
|
TOSCA-200
|
CSD04
|
Open
Review
|
Vachnis, Parasol
|
Query based upon capability
|
New instance model functions to be provided.
|
|
TOSCA-201
|
CSD03
|
Deferred
|
Lauwers
|
Harmonize Properties and Capabilities in Node Types
|
Deferred
|
|
TOSCA-202
|
CSD03
|
Open
FIXED
|
Boutier
|
Cardinalities for capabilities and requirements
|
Subtask of TOSCA-148
Verify fix with Luc.
|
|
TOSCA-205
|
CSD03
|
Open
|
Boutier
|
Add
interface type.
|
|
|
TOSCA-208
|
CSD03
|
Open
|
Boutier
|
Add
conditional capabilities (enable/disable capabilities on a node)
|
|
|
TOSCA-209
|
CSD02
|
Open
|
Rutkowski
|
Fix Grouping example to use correct parameter for
WebServer
|
|
|
TOSCA-210
|
CSD02
|
Open
|
Rutkowski
|
Need example on get_xxx functions using HOST keyword
|
|
|
TOSCA-211
|
CSD02
|
Open
|
Rutkowski
|
Need version on TOSCA Types (Node, Relationship, etc.)
|
|
|
TOSCA-213
|
CSD03
|
Open
|
Lauwers
|
Clarify
distinction between declaring properties and assigning property values
|
|
|
TOSCA-214
|
CSD02
|
Open
|
Vachnis / Rutkowski
|
New
functions for accessing the instance model
|
|
|
TOSCA-217
|
CSD02
|
Open
|
Spatzier / Rutkowski
|
Add new simplified, single-line list notation / grammar
for Requirement Def.
|
|
|
TOSCA-219
|
CSD03
|
Open
|
Boutier
|
Workflow/Plan
generation and components state dependency
|
|
|
TOSCA-220
|
CSD03
|
Open
|
Boutier
|
get_artifact function
|
Proposal in DOCX lined to issue
|
|
TOSCA-224
|
CSD03
|
Open
|
Rutkowski
|
Discuss removing "github_url" property from
non-normative Nodejs Node Type
|
|
|
TOSCA-225
|
CSD03
|
New
|
Palma
|
Adding a (untyped) dependency relationship between Node
Templates
|
|
|
TOSCA-226
|
CSD03
|
New
|
Spatzier
|
Proposal (incomplete) to change Requirement Def. from
Ordered List to a Map
|
|
|
TOSCA-227
|
CSD03
|
New
|
Spatzier
|
Proposal (incomplete) to change Property Filters Ordered
List to a Map
|
|
|
TOSCA-228
|
CSD05
|
Defer
|
Rutkowski
|
Discuss "Final" concept for Types, Operation and
properties
|
Matt agrees to Defer
|
|
TOSCA-229
|
CSD03
|
Open
|
Boutier
|
Requirements / target filters and subsituable / selectable
are too confusing.
|
|
|
TOSCA-230
|
CSD03
|
Open
|
Zala
|
TOSCA artifacts doesn't resolve version dependency
|
|
|
TOSCA-231
|
CSD03
|
Open
|
Boutier
|
Scalar units and get_property
|
|
|
TOSCA-232
|
CSD03
Fixed
|
Open
|
Shitao Li
|
Adding metadata section in Service template
|
NFV WG submitted
|
|
TOSCA-233
|
CSD03
|
Open
|
Shitao Li
|
How to handle VM image in terms of software component
|
We now know how we want to do this, just need example in
Appendix H to show
|
|
TOSCA-234
|
CSD03
|
Open
|
Rutkowski
|
Discuss removing "github_url" property from
non-normative Nodejs Node Type
|
|
|
TOSCA-235
|
CSD03
|
Open
|
Rutkowski
|
Endpoint capability needs support for Fixed IPs
|
Relates to Floating IP work.
|
|
TOSCA-236
|
CSD03
|
Open
Close
|
Rutkowski
|
Mark IaaS Node Types as "substitutable" since
the Orchestrator can determine impl. by default
|
No longer valid, all nodes are now “selectable” can be be
substituted with another topology (template).
|
|
TOSCA-238
|
CSD03
|
Open
|
Zala,
Rutkowski
|
Task: Author Section A.1.1 "A.1.1 Rules to avoid
namespace collisions
|
|
|
TOSCA-239
|
CSD03
|
Open
CLOSED
|
Rutkowski
|
Feature: Address override comment in Chapter 5
|
|
|
TOSCA-240
|
CSD03
|
Open
|
Rutkowski
|
Ch6. How are artifacts referenced from CSAR file?
Automatic copy/delete?
|
|
|
TOSCA-241
|
CSD04
|
Open
|
Rutkowski
|
Task: See if OASIS will allow us to use "fix"
version in TOSCA version strings
|
|
|
TOSCA-242
|
CSD04
|
Open
|
[Zala]
|
How to use 'output' section - new use case needed
|
|
|
TOSCA-243
|
CSD04
|
Open
|
[Zala]
|
CSD04: Need mechanism to retrieve parent type's operation
script
|
|
|
TOSCA-244
|
CSD04
|
Open
|
Boutier
|
Need to add clarity around orchestrator's copy behavior
for script
|
|
|
TOSCA-245
|
CSD04
|
Open
|
[Zala]
|
Need clear description of relationship priority/ordering
during deployment
|
|
|
TOSCA-246
|
CSD04
|
Open
|
[Zala]
|
Define global/environment dependencies emphasis on script
processors
|
|
|
TOSCA-247
|
CSD03
|
Open
Fixed
|
Rutkowski
|
Need description of abstract/subst. node types and
application of node_filters
|
|
|
TOSCA-248
|
CSD04
|
Open
|
Spatzier
|
Consider mapping inputs and outputs and show different
naming with example
|
|
|
TOSCA-249
|
CSD04
|
Open
|
Rutkowski
|
Verify artifacts definition grammar applies to both
artifacts type and artifacts templates
|
|
|
TOSCA-250
|
CSD04
|
Open
|
Rutkowski
|
Determine how to avoid collision of artifacts types
installed into node environments
|
|
|
TOSCA-251
|
CSD04
|
Open
|
[Zala]
|
Explore moving Appendix G (modeling use cases) to earlier
chapters.
|
|
The following individuals have participated in the creation
of this specification and are gratefully acknowledged:
Contributors:
Avi Vachnis (avi.vachnis@alcatel-lucent.com), Alcatel-Lucent
Chris Lauwers (lauwers@ubicity.com)
Derek Palma (dpalma@vnomic.com), Vnomic
Frank Leymann (Frank.Leymann@informatik.uni-stuttgart.de),
Univ. of Stuttgart
Gerd Breiter (gbreiter@de.ibm.com), IBM
Hemal Surti (hsurti@cisco.com), Cisco
Ifat Afek (ifat.afek@alcatel-lucent.com), Alcatel-Lucent
Idan Moyal, (idan@gigaspaces.com), Gigaspaces
Jacques Durand (jdurand@us.fujitsu.com),
Fujitsu
Jin Qin, (chin.qinjin@huawei.com), Huawei
Juergen Meynert (juergen.meynert@ts.fujitsu.com), Fujitsu
Kapil Thangavelu (kapil.thangavelu@canonical.com), Canonical
Karsten Beins (karsten.beins@ts.fujitsu.com), Fujitsu
Kevin Wilson (kevin.l.wilson@hp.com), HP
Krishna Raman (kraman@redhat.com) , Red Hat
Luc Boutier (luc.boutier@fastconnect.fr), FastConnect
Matt Rutkowski (mrutkows@us.ibm.com), IBM
Moshe Elisha (moshe.elisha@alcatel-lucent.com),
Alcatel-Lucent
Nate Finch (nate.finch@canonical.com), Canonical
Nikunj Nemani (nnemani@vmware.com), WMware
Richard Probst (richard.probst@sap.com), SAP AG
Sahdev Zala (spzala@us.ibm.com), IBM
Shitao li (lishitao@huawei.com), Huawei
Simeon Monov (sdmonov@us.ibm.com), IBM
Stephane Maes (stephane.maes@hp.com), HP
Thomas Spatzier (thomas.spatzier@de.ibm.com), IBM
Ton Ngo (ton@us.ibm.com), IBM
Travis Tripp (travis.tripp@hp.com), HP
Vahid Hashemian (vahidhashemian@us.ibm.com), IBM
Wayne Witzel (wayne.witzel@canonical.com), Canonical
Yaron Parasol (yaronpa@gigaspaces.com),
Gigaspaces
|
Revision
|
Date
|
Editor
|
Changes Made
|
|
WD05, Rev01
|
2014-12-11
|
Matt Rutkowski, IBM
|
· Initial
WD05, Revision 01 baseline.
|
|
WD05, Rev02
|
2015-01-18
|
Matt Rutkowski, IBM
|
· Separated
out scalar-unit.size while adding base 2 values and added scalar-unit.time
with examples and informative references.
· Fixed
constraints in Endpoint to allow for either (optionally) port as PortDef or
map of PortSpec.
· Updated
properties using old scalar-unit to use scalar-unit.size
|
|
WD05, Rev03
|
2015-01-21
|
Matt Rutkowski, IBM
|
· Fixed
missing requires=false clauses on port and ports properties of Endpoint.
· Removed
anonymous types for lists and maps. Removed reference from schema definition
form Properties and adjusted Properties to reflect resulting set of reduced
properties for entry0-schema.
· Incorporated
comments from Chris L. addressed/fixed typos and non-material corrections
identified.
· Fixed
PortSpec definition and example from Victor.
· Fixed
other typos found while integrating Chris’ comments.
|
|
WD05, Rev04
|
2015-01-29
|
Matt Rutkowski, IBM
|
· Removed
Simple interface to prevent invalid YAML on the TOSCA Root node type and
avoids describing multiple instance/sequencing of methods with different
names and would cause type proliferation (standard vs. simple types).
· Section
18 example: Fixed invalid YAML and assured TOSCA-191 has correct problem
stated.
· A.4.14,
C.2.3 Removed the “type” keyword from schema (datatype) definitions as there
should be only one keyword (i.e., “derived_from”) used to define new types.
It also made no sense to continue existing paradigm of using “derived_from”
as we have in all other places.
· A.4.2.1:
Added range type to in_range constraint and map and list types to some
length-based constraints. Added scalar-unit types to list of comparable
types with requirements to include units in comparison.
· A.4.4:
The “type” keyname on a Property Definition is no longer mandatory as new
datatypes are not required to derive from an existing type.
· Formerly
A.4.14: Removed “type” keyname from schema in favor of “derived_from” as both
were not needed since data_types were added.
· A.4.14,
A.4.15: merged “Schema Definition” from A4.14 into “Datatype definition” as
this is the only place this grammar is referenced since removing it from
“entry_schema” grammar.
· A.4.21:
Fixed unclear use/description of property filters under named capabilities
listed on the overall filter definition.
· A.4.21:
Added “attributes” keyname (and attribute definitions) to the Capability
Type.
· A.4.26:
Added Attribute value assignment section (A4.26)
· A.4.27:
Added Property value assignment section (A4.26)
· A.5.1:
Changed “datatype_definitions” to just “data_types” to match the names of
other keys used in the service template (e.g., node_types,
relationship_types, etc.).
|
|
WD05, Rev05
|
2015-02-02
|
Matt Rutkowski, IBM
|
· A.4.5:
documented “status_value” in grammar
· A.5.2.2
– Fixed map example; missing ContactInfo and copy-paste error.
· TOSCA-218 - A.4.22,
C.3.1.1 – Changed “valid_node_types” from a property to a meta-level keyname
of “valid_node_types”. This affects the grammar of several normative TOSCA
capability types.
· Merged
in numerous additional comments from Chris against WD05, Rev03, mostly in
Sections 1-14 but also a few grammar comments in the topology template
section.
· Port
Type requirements “binding” and “link” were not ordered list (fixed) and link
should appear before binding. Fixed network example to match.
· Added
a section A.4.1 to clearly state that required keynames do not have to appear
in types that derive from another (parent) type that already provides them.
· Changed
meta-level keynames “valid_node_types” to the key “valid_types” which allows
more than nodes as sources for a capability type.
· Added
a “Required” column for most of the Keyname tables for Appendix A in order to
better see which keynames are required.
· A.4.3.2
- Clarified that the “equals” constraint (operand) is optional and if a value
simply appears it should be interpreted as “equals”.
· Fixed
examples in sections 6 and 7 to reference the latest non-normative and
normative type properties and methods (e.g., get_attribute for ip_address).
· A.4.18,
F.1.3 – Identified issues in Requirement definition (A.4.18) as shown use
case in F.1.3. Documented as “mustfix”.
|
|
WD05, Rev06
|
2015-02-05
|
Matt Rutkowski, IBM
|
· Appendix
H: Added a placeholder section with early considerations for policies, their
grammar and use cases.
· Resolved
to preserve the description of direction (i.e., source and target) in the
name of “valid_types” keynames that indicate what nodes types are allowed on
each end of a TOSCA Relationship.
o A.4.25 - In the case of
Relationship Types, we will use “valid_target_types” to indicate what types a
relationship can be connected to (point to or target).
o A.4.23 - For Capability
Types we use “valid_source_types” to indicate what source node types are
allowed to form relationships to the nodes the capability are declared in.
o Adjusted all examples to
use new keynames.
· C.5.1
– The key “valid_target_type” for tosca.relationships.Root should not have
been included and was removed. It had indicated that any tosca.nodes.Root.
· F.1.4
– Removed duplication of normative type definitions included in modeling use
case /example. This caused us to maintain normative types accurate in two
places and was confusing to readers.
· G.1.4.4,
G.1.4.5 – Moved custom AttachesTo relationship from x.5 to x.4 and adjusted
to use current grammar.
· E.5.2
- Fixed tosca.nodes.network.Port definition to use correct “node” keyword
· E.6
- Adjusted example templates in E.6.1 and E.6.2 to change “tosca.nodes.Port”
to “tosca.nodes.network.Port” for all occurrences.
· E.6
- Adjusted example templates in E.6.1 and E.6.2 to change
“tosca.nodes.Network” to “tosca.nodes.network.Network” for all occurrences.
· A.2.3:
Added “UNBOUNDED” keyword to TOSCA range type
· A.4.18:
Added “occurrences” keyname to Requirement def.
· C.3.2,
C.5.2: Added “tosca.capabilities.node” and added it as the default target
type for the DependsOn relationship.
· C.7.1:
Fixed “tosca.nodes.root definition”
o Added “state” attribute
def. to grammar
o Fixed the built-in
“dependency” requirement adding cardinality default of [0, UNBOUNDED]. This
allows section 10 example to remain valid AND fixes all normative node type
definitions.
o Added “feature”
capability of type “tosca.capabilities.node”
· C.5.2.1:
Added the tosca.capabilities.Root to “valid_target_types” of the DependsOn
Relationship type.
· Section
13.2, Section 14: Merged in template “substitution” use cases in place of old
“nested templates” to reflect current WG focus in this area.
· C.5.3.1:
HostedOn now derives from tosca.relationships.Root.
· A.3.2:
Directives section to describe reserved values for “directives” keyname and
added “substitutable” value for Node Templates.
· C.5.3:
Changed HostedOn to derive from Root instead of DependsOn
· D.2.4:
Changed “database_endpoint” requirement to “wordpress_database_requirement”
and fixed it have the ConnectsTo relationship and “database_endpoint”
capability values. This will allow us to test the ability to connect a
relationship to a type-compatible capability in another node when the
symbolic names do not match. Updated use cases for wordpress.
· Appendix
A: Reorganized section to group reusable element, types and template
definitions together. Also removed simple “list” element definitions as they
served little purpose and moved their grammars in-line to where they were
referenced.
· A.6.4
- Added the Interface Type to allow new interfaces to be defined; it is
slightly different than an interface definition (more restrictive). Please
read “Additional Requirements”. Also, added a means to define them in the
Service Template using the interfaces keyword.
· C.5.1,
C.7.1 - Changed the “interfaces” keyword grammar for both tosca.nodes.Root
and tosca.relationships.Root to reflect the correct way to declare an
interface (not using a simple list).
· A.5.9
- Added “type” keyword to Interfaces definition and changed example to better
distinguish it from Interface Type example.
· A.6
Service Template - Added note describing how Types can be defined in Service
Templates (no topology-template) for import/use in other service templates.
· C.3.5
- Changed tosca.capabilities.DatabaseEndpoint to
tosca.capabilities.EndPoint.Database. Updated MySQL Node Type to reflect
this change. We do not need to specify an Endpoint.Database.MySQL capability
type as the requirement should differentiate the database by its Node Type
(MySQL) and not its capability.
· C.7.2:
added “local_storage” requirement (occurrences [0,unbounded]) to actually
allow us a built-in way to attach BlockStorage nodes.
· C.3.5:
Added tosca.capabilities.Endpoint.Admin
· C.5.4:
Added Credential property to ConnectsTo relationship
|
|
WD05, Rev07
|
2015-03-02
|
Matt Rutkowski, IBM
|
· A.5.7:
Added the “final” keyname to the Property definition. Added final: true to
the Endpoint.Admin capability property “secure” so subclasses cannot change
this value.
· Clarified
C.5.5 AttachesTo relationship properties.
· B.4.2,
B.5.1 – Fixed get_attribute and get_property grammar to not confuse the
square bracket ‘[‘ meaning “optional parameter” with the YAML square bracket
for simple list (set).
· B.3,
B.3.1: Added “Intrinsic function section and the definition of the “concat”
function to address TOSCA-212.
· F.1.1:
Fixed “valid_source_types” still listed as a property and corrected
description of its use in the prose
· A.6.1:
Assured valid_source_types” was in Capability definition.
· C.7.10:
Containee Node Type placeholder.
|
|
WD05, Rev08
|
2015-03-03
|
Matt Rutkowski, IBM
|
· A.5.7:
Removed “final” from properties until we have a comprehensive discussion on a
“final” designator for Type definitions (Nodes, Rels. Data, etc.) and on
interfaces/operations (to lock down implementation scripts).
o Opened JIRA
issue TOSCA-228
to discuss
· A.5.8:
Fixed Operation definition to include different grammars for use in Types
versus Templates (Node and Relationship). Also provided new Additional
requirements that describe artifact override behaviors.
· A.5.8:
Fixed Operation definition to include different grammars for use in Types
versus Templates (Node and Relationship).
· A.6.2:
Removed “node_filter” (keyword and grammar) from Node Type requirement
definitions as it should only be valid on Node Template definitions.
· A.7.4:
Node Template: Added the “node_filter” keyname (with node filter grammar) and
additional requirements on usage in conjunction with the “selectable”
directive.
· A.3.2:
Added “selectable” directive keyword.
· A.6.1:
Added valid_source_types to Capability definition and added a requirement
that only allows for subclasses to provide Node Types (names) for this
keyname that are type-compatible and derived from types declared in their
parent class.
· 11.1:
Authored a section to show how “selectable” can be used as an alternative way
to provide dynamic matching to what is described earlier in Section 11.
· Assure
the consistent use of “keyname” versus “keyword” throughout the document.
· 17.1:
Removed Use case: “Providing input properties for all interfaces” which has
no comparison in other language designs. In addition, we had no real or
practical examples for this nor had we added the grammar for this.
· 19:
Fixed example to use a relationship template, previously we were using
get_attribute to retrieve a value on the abstract ConnectsTo relationship
directly on a Node Type definition which is illegal in the grammar.
· 8:
Fixed example to use a relationship template for a custom connection as the
grammar dos not allow behaviors (scripts) to be provided on abstract
ConnectsTo relationship types on Requirement definitions.
· F.1.4:
Removed invalid use of “default” keyname on Relationship Type examples.
· F.1.5:
Removed placeholder (empty) section for examples of “add_target”,
“remove_target” and “target_changed” operations as we should explore these as
part of then-tier logging use case in Section G.1.9.
|
|
WD05, Rev09
|
2015-03-17
|
Matt Rutkowski, IBM
|
· Sections
1-19: added “highlighting” to keywords in code samples that were being
featured in the surrounding text (to better highlight or feature the new idea
being introduced by that section).
· A.7.4,
A.7.5: Added the “copy” keyname to Node and Relationship Template definitions
/ grammars. This was described in use case in section F.1.4 which was
updated to reflect the name change to “copy” from “alias” which was not a
good descriptive keyname.
· B.2.1:
Clarified where the IDs come from (i.e., tosca_id attribute).
· C.3.8.1:
OperatingSystem Capability type, changed type and architecture to optional
from required allowing more nodes to use this capability.
· A2,
C.7: Added the type name (i.e., shortname, qualified and typeURI) for every
TOSCA datatype that did not have one declare.
· A.2.2:
Added constraints for TOSCA version type
· C.7.6,
C.7.7: Removed prefixes on properties to follow working group decision to not
use prefixes and have already removed them on other node types. This means
prefixes “db_” and “dbms_” are removed from property names on Database and
DBMS Node Types respectively.
· C.7.8:
Remove “store_” prefix from ObjectStore
· C.7.9:
Removed redundant attribute “VolumeId” as we have “volume_id” as a property
which would be the (reflected) attribute we would use to retrieve the ID
assigned by the platform.
· D.1.4:
removed “db_” prefix from non-normative WordPress node type.
· A.8.1:
Added example for relationship template
· G.1.9:
Renamed the “N-Tier” use case to Elasticsearch, Logstash, Kibana (ELK) use
case to better feature the new open source components the use case is adding.
· A.5.8:
Removed “default” keyname from attribute.
· A.5.9:
Added clarification (additional requirement) that allows implementations to
provide attribute values at runtime apart from template-included value
expressions.
· C.7.2,
C.7.3: Removed deprecated ip_address property from Compute and
SoftwareComponent node types. This was used for demos in early drafts and
should not be in v1.0, especially now that we have a proper network model
supporting multiple IPaddresses. We now have clearly distinguishable
“public_address” and “private_address” attributes in Compute node. Cascade
the name change across all use cases in document.
· E.5.2:
Removed redundant “ip_address” attribute (since it already is a property it
is automatically also an attribute).
· C.3.8:
Fixed copy-paste error for OperatingSystem “Definition” (YAML). the
properties were copied from Scalable and did not reflect the properties
listed in the table.
· C.3.8.1:
Added “TOSCA version” to OS capability instead of string. TOSCA-134 fix.
· A.6.1:
Removed TOSCA-225 comments (cardinality) as we now have “occurrences” keyword
for this.
· F.1.1:
Fixed use case to use ONLY the current requirement and capability grammar,
removed use cases that showed grammar that was no longer supported. Adjusted
text, notes and best practice text to reflect the current design of the
normative WebServer and WebApplication types.
· A.7.1:
Reworked the Requirement assignment grammar and use cases to reflect the
desired requirement grammar within Node Templates. Removed 2 examples in this
section that are no longer valid and fixed the remaining three examples to be
accurate to the new grammar. Note, some additional work may need to be done
on the examples, but the grammar SHOULD be final barring any unforeseen
problems during TC review.
|
|
WD05, Rev10
|
2015-03-20
|
Matt Rutkowski, IBM
|
· A.2.6:
Added scalar-unit.frequency to allow for properties that provide values that
measure in units per second such as CPU clock rate / processing speed (e.g.,
operations per second).
· C.7.2,
C.3.3: Moved num_cpus, mem_size and disk_size properties from Compute node to
Container capability.
o Added “required: false”
to these properties as per WG agreement.
· C.3.3:
Added “cpu_frequency” property to Container capability.
o set default .1 GHz,
please review.
· C.2.4:
fix PortSpec. Not supposed to be a list of source and target.
· D.1.1:
Added non-normative tosca.capabilities.Docker with port mapping support.
· G.1:
Added ELK use case to overview table
|
|
WD05, Rev11
|
2015-03-31
|
Matt Rutkowski, IBM
|
· A.2.2.1:
“fix_version” portion of the TOSCA version string is now optional.
· A.2.6:
Added requirement that it is an error if scalar-units do not both have the
scalar and unit portion in a declaration. General cleanup to assure we use
the prescriptive language for requirement (e.g., SHALL).
· A.5.4:
Added “additional requirement” requiring search order for capabilities on a
target filter to assume a symbolic name first and a type name second to avoid
namespace collisions (although collisions should not occur).
· A.5.4.5:
Clarified “node_filter” example.
· A.3.1:
Added Network name aliases (primary used in Endpoints).
· Appendix
E: Inserted chapter that describes minor changes to the CSAR file format over
the version described in TOSCA v1.0. Thanks Thomas for authoring.
· Ch
7, 14.3, 15, 16, 17.3, 17.4 – Incorporated fixes and address comments
received from Chris.
· A.2.3:
UNBOUNDED definition updated to be clearer. (addressed comment from Chris)
· A.5.8
Attribute Defn. – was missing entry_schema (Chris found)
· A.7.2:
adjusted Requirement Def. description to be correct.
· A.7.3:
copy had wrong declared type, changed to string. Adjusted ‘copy’ grammar to
be single line.
· C.3.10.2:
BindsTo derived_from updated.
· C.5.4:
missing Credential property from ConnectsTo definition (grammar).
· C.5.5:
Changed “AttachTo” type to “AttachesTo” to match all other “active” names
used in Relationship Types. This caused cascading changes to many examples
and use cases. (Chris)
· F.5.2:
Port Node Type now needs “relationship” type in definition. (Chris caught)
· F.5.3:
Linkable needs to derive from Node capability type. (Chris)
· G.1.2:
Missing topology_template in example (Chris)
· G.1.3:
Missing “GB” on scalar unit type (Chris)
|
|
WD05, Rev12
|
2015-04-08
|
Matt Rutkowski, IBM
|
· A.3.1:
Network name alias: defined built-on values for application authors to use to
describe networks in Endpoints relative to logical public and private
networks (regardless of actual name of the network) assigned at runtime.
· A.7.3,
A.7.3: Requirement assignment and Node Template keyname “target_filter”
renamed to “node_filter” to be more generic and reflect exactly the type of
TOSCA entity (node) that the filter would be used to select.
· B.3.1:
token: Added the “token” intrinsic function to extract substrings that are
inside a larger string and separated by tokens.
· A.5.9:
Attribute assignment: Fixed grammar to include the multi-line form that
allows a “description” and “value” keyname.
· A.8.1.4:
The “output” grammar was based upon the property definition which is
incorrect; it should be based upon attribute assignment.
· A.5.6.5:
Property definition: Moved requirement language buried in the keynames table
to the actual “Additional requirements” section.
· A.5.11:
Operation definition: Added the ability to have both a “primary” artifact
(script) and other dependent artifacts for a single operation.
· A.5.6:
Repository definition: added definition to allow definition of external
(artifact) repositories that can be used to host/hold TOSCA artifacts.
· A.5.5:
Artifact definition: added “repository” keyname to definition to allow
artifacts to be located in an external repository.
· A.9:
Service Template: added “repositories” keyname to allow one or more repository
definitions.
· D.3.6:
tosca.nodes.Docker.Container: a non-normative “Docker friendly” Node Type for
use when modeling Docker “containers” which in TOSCA are really “Containees”.
|
|
WD05, Rev13
|
2015-04-28
|
Matt Rutkowski, IBM
|
· A.7.2:
Requirement assignment: Added “properties” keyname to allow property
assignments to the relationship keyname.
· C.3.4:
Endpoint: made “PRIVATE” default for “network_name” for implementations to
default to the first IP address found on the first private network if user
does not specific otherwise (as an input or in the template).
· A.3.3:
Added more complete definitions for PUBLIC versus PRIVATE networks.
· C.7.10,
C.7.11: Container.Runtime and Container.Application replace Container and
Containee to better adapt to semantic of the Linux container communities such
as Docker and Rocket. Note this mirrors WebServer and WebApplication and can
be applied to Java runtimes and apps as well.
· H.1.10.3,
H.1.10.4: Provided latest “master” service template for ELK and removed
scripts as there are too many to reasonable list. Instead we are moving to
providing a URL to the live repo.
· H1:
Completely revamped section to reflect actual running use cases with links to
current code. Removed use cases that did not make sense, added others that
showed interesting TOSCA concepts.
· H1:
Added URL links to all use cases master/entry definition Service Template as
it is stored in OpenStack for reference.
· H.3.2-H.3.6
now lists each Block storage variation (use case) as its own top-level use
case.
· H.3.8:
ObjectStorage use case: Moved up and reworked to new style and latest service
template
· H.3.9-H.3.11:
Network use cases: we now have 3 different variant network use cases thanks
to Simeon Monov.
· H.1:
added Docker use case description
· H2:
removed outdated Blockstorage use cases which are now covered by new ones or
did not make sense (e.g., multiple block storage example).
· F.5.1.
Network Node: Added network type and physical network optional properties per
Simeon Monov suggestion.
· C.8.3,
C.8.4: Added base artifact types for both implementation and deployment
types.
· C.7.2:
Compute: Changed “Endpoint” to “Endpoint.Admin”
· C.7.7:
Database: Simplified description of Database node type.
· C.8:
Added “Type URI”, “Qualified” and “Shortname” names for TOSCA artifact types.
· C.8.3:
Added Python implementation type.
· C.2.1:
Credential: No longer has “network” in type URI
· C.5.4:
ConnectsTo: Use full TypeURI for Credential in definition.
· C.7.12,
C.7.13: Added FloatingAddress and LoadBalancer
· C.5.6:
Added RoutesTo relationship type for FloatingAddress.
|
|
WD05, Rev14
|
2015-04-29
|
Matt Rutkowski, IBM
|
· B.8.1:
Updated get_artifact to include work group’s agreed upon parms, Thanks Luc
Boutier for this contribution (TOSCA-220).
· A.6.2:
Requirement Definition: Added support in grammar to add additional Property
definitions on known interfaces or their operations.
· A.5.11,
A.5.12: Updated Interface and Operation definitions to include consideration
of when they are used as part of a Requirement definition or Requirement
assignment (in a Node Type or Node Template respecfively).
· A.6.1:
Added “occurrences” keyname to Capability def. to support NFV use cases.
· H.2.7:
ObjectStorage: Added template and diagram
· C.3.5:
Added Endpoint.Public with experimental support for Floating IP capabilities
via new properties.
· C.7.12:
Added LoadBalancer node type which has an Endpoint.Public which can advantage
the Floating IP support.
· C.5.6:
Added RoutesTo for LoadBalancers primarily (but could be used for any
intentional network traversal.
· C.3.6:
Added Add. Req. to Admin endpoint to required security enforcement where
possible
|
|
WD05, Rev15
|
2015-05-04
|
Matt Rutkowski, IBM
|
· Appendix
H: Fixed all examples to use scaler-unit.size for all storage_size inputs.
(Chris) F
· Appendix
H: Fixed “KB” to “kB” even though this is allowed by scalar-unit defintions.
(Chris)
· Appendix
H: Assured that the requirement used for Compute for storage attachment was
indeed “local_storage”. (Chris)
· Appendix
G.1.4: Used real Compute “local_storage” requirement, provided a location
property value for custom AttachTo type and also used the actual Configure
interface and one of its pre_configure operations as suggested (Chris).
· C.3.5:
Endpoint.Public: clarified descriptions and added additional requirement for
DNS name.
· C.2.1:
Credential: Additional requirements added for token validate. Also, keys and
protocol are no longer required properties.
· C.2.1:
Credential: Added optional user property for legacy use cases
· C.2.1.5:
Credential: Added new example to show use of Credential to pass in a simple
user name / password without using BasicAuth.
· C.7.6:
DBMS: root_password property is not required since MongoDB and other Database
services do not need this; if it is required, such as for MySQL then the
subtype can alter it to be required.
· C.7.7:
Database: user and password properties are no longer required as some
databases do not use this concept.
· D.3.2:
MySQL: root_password is required for MySQL database configuration.
· H.2.8:
ObjectStorage: Fixed use case template to current spec.
|
|
WD05, Rev16
|
2015-05-06
|
Matt Rutkowski, IBM
|
· C.3.8.2:
File: Now derives from tosca.artifacts.Implementation (type name changed).
· H.1.16:
Updated to spec. and comments added for future changes that are needed.
· D.1.2:
Image.VM: Added artifact type for VM images.
· D.3.2:
MySQL: requires root_passwprd
· H.1.18:
Container example: Fixed artifact and node types in example’s template.
· A.8.1.15:
Fixed “groups” grammar.
· A.9.1:
TOSCA-232: metadata keyname added and several optional keynames of the
service template were moved under it. This was a requirement that came from
the NFV work group.
· C.7.13:
LoadBalancer: added occurrences and explained why it allows zero applications
on its application requirement.
|
|
WD05, Rev17
|
2015-05-14
|
Matt Rutkowski, IBM
|
· Note:
These changes reflect changes agreed to during the 5/7/2016 half-day Simple
Profile spec. review.
· A.3.2:
Directives: Preserved the keyname “directives” for node templates, but here
removed values “selectable” and “substitutable” since we no longer need them
as all nodes are “selectable” and “substitutable” was determined to be
equivalent to selectable.
· Ch.
11: Re-authored to define “concrete” vs. “abstract” nodes and all nodes that
are “abstract” in TOSCA are selectable (and therefore substitutable).
· Ch.
12: Moved this to Ch. 11.3 as another use case for using node-filter to
fulfill an abstract node through selection.
· Ch.
13: Substitution for chaining: Removed the need to use the “substitutable”
directive” (only use of it anywhere in the spec.); all abstract nodes can be
“substitutable” including the Transaction and Queueing subsystems described
in the use case in this chapter.
· Ch.
3-6: Added logical diagrams to help visualize use cases described only as
YAML templates.
· D.1.2.1:
VM: Added a note that future subclasses of the VM artifact type might include
popular standard image and container formats
· H.1.16,
H.1.17, H.1.18: Updated use cases YAML to latest draft.
|
