☰

Official Plugins

Overview

Cloudify plugins are Python packages that function as the communication with external systems. Primarily:

Infrastructure Plugins
Infrastructure Plugins
Configuration Plugins
Configuration Plugins

For example:

Background

Blueprints use the Cloudify DSL to model an application. The model, or node_templates section, describes a topology that includes:

Workflows actualize the topology by defining the order of operations that will be performed. For example, the built-in Install Workflow calls, among other things, the create, configure, and start operations defined for a particular node type.

Plugins contain the Python code that each workflow operation calls.

Usage

In your blueprint, use the Import statement to import plugins, for example:

imports:
  - plugin: cloudify-azure-plugin

You can then map node template and relationship operations to plugin code, or if your plugin’s plugin.yaml has custom node types, these operations may already be mapped for you.

Example Blueprint with REST Call

The following example illustrates the configuration step. In it, we create a user via some REST API.

In the blueprint, we define the lifecycle steps, along with the inputs for the plugin operation:

Let’s break down each section:

Now, let’s talk about our node_template:

create-user-post-template.yaml

This is the template file, which contains a list of requests. We define the path, the payload, and define the expected responses.

rest_calls:
 # create user post
  - path: /posts/{{POST_ID}}
    method: PUT
    headers:
      Content-type: application/json
    payload:
      title: '{{ USERNAME }}'
      body: '{{ WEBSITE }}'
      userId: '{{ USER_ID }}'
    response_format: json
    recoverable_codes: [400]
    response_expectation:
      - ['id', '{{POST_ID}}']

Only one request is defined here, but you can define bunch requests as well as successful and failure responses.

For more information on modeling REST request sequences, see the REST Plugin.

Example Blueprint with Example Script

A another way to understand using Cloudify plugins is to use Cloudify with existing scripts.

For example, let’s say that you have a BASH script like this:

scripts/hello.sh

#!/bin/bash
# myblueprint/scripts/hello.sh
ctx logger info "Hello World"

All this script does right now is log a “Hello World” message message to Cloudify. However, you can put just about any valid BASH script here.

To run the following, you will need the following for a real VM:

Let’s review:

For more information, see the Script Plugin.

Example Blueprint with Blueprint Mapped Operations

The following example describes configuring one or more hosts with Ansible.

Just like last example, you will need the following for a real VM:

In this blueprint, we don’t define any properties. Instead, we map everything as an operation.

For more information, see the Ansible Plugin.

Example Blueprint with Custom Node Types

The following example describes the creation of a connected AWS EC2 Internet Gateway and VPC. The cloudify-aws-plugin’s plugin.yaml already defines the node types cloudify.nodes.aws.ec2.InternetGateway and cloudify.nodes.aws.ec2.Vpc, and maps their lifecycle operations to plugin tasks.

You will need the following secrets: * aws_access_key_id: The AWS Access Key. * aws_secret_access_key: The AWS Secret Key.

You will also need to provide the following inputs: * region_name: The AWS region name.

tosca_definitions_version: cloudify_dsl_1_3
imports:
  - http://cloudify.co/spec/cloudify/5.0.0/types.yaml
  - plugin:cloudify-aws-plugin
inputs:
  region_name:
    type: string
dsl_definitions:
  _: &client_config
    aws_access_key_id: { get_secret: aws_access_key_id }
    aws_secret_access_key: { get_secret: aws_secret_access_key }
    region_name: { get_input: region_name }
node_templates:
  internet_gateway:
    type: cloudify.nodes.aws.ec2.InternetGateway
    properties:
      client_config: *client_config
    relationships:
    - type: cloudify.relationships.connected_to
      target: vpc
  vpc:
    type: cloudify.nodes.aws.ec2.Vpc
    properties:
      resource_config:
        CidrBlock: { get_input: vpc_cidr }
      client_config: *client_config

Let’s review:

We have the following nodes: * internet_gateway: This is an internet gateway. We use a cloudify.relationships.connected_to relationship to define dependency on vpc. * vpc: This is a VPC.

Properties: * We provide to both resources their configuration in the resource_config property. * Authentication is defined in the client_config property.

For more information, see the AWS Plugin.

Distribution

Cloudify plugins are distributed in a Wagon format. Wagons are archives of Python Wheels. The latest official Cloudify plugins are available for download.

Installation

You may upload a plugin to your Cloudify Manager via either the UI or the CLI:

Contributing

See our community Contribution Guide.

Further Reading

For more information on creating your own plugin, see creating your own plugin. For a plugin template, see plugin template.

For information on packaging a plugin in wagon format, see creating wagons.

For an overview on working with CM systems, see Configuration Management.

For information on working with Docker and other container systems, see Containers.