heat_template_version: 2013-05-23
###################################################################
# The example is designed to demo how software deployment to handle
# dependencies.
#
# The scenario:
#  deployment_c -- hosted on --> server_a
#  | (explicit depends on via depends_on property)
#  deployment_b -- hosted on --> server_b
#  | (implicit depends on via get_attr in input_values property)
#  deployment_a -- hosted on --> server_a
#
# So the right deployment sequence should be:
#  deployment_a (server_a)
#  -->
#  deployment_b (server_b)
#  -->
#  deployment_c (back to server_a)
#
# How to deploy the sample:
#
# 1. Create on image with element heat-config-script in
# 2. openstack stack create -t example-deploy-sequence.yaml sequence
# 3. openstack stack show sequence
###################################################################
parameters:
  key_name:
    type: string
    default: heat_key
  flavor:
    type: string
    default: m1.small
  image:
    type: string
    default: fedora-amd64
resources:
  config:
    type: OS::Heat::SoftwareConfig
    properties:
      inputs:
      - name: previous
        default: 'NONE'
      group: script
      config: |
        #!/bin/bash
        echo "Previous: $previous"
        echo "${deploy_resource_name} is running on $(hostname) at $(date)"
  deployment_a:
    type: OS::Heat::SoftwareDeployment
    properties:
      config:
        get_resource: config
      server:
        get_resource: server_a
  deployment_b:
    type: OS::Heat::SoftwareDeployment
    properties:
      input_values:
        previous:
          get_attr: [deployment_a, deploy_stdout]
      config:
        get_resource: config
      server:
        get_resource: server_b
  deployment_c:
    type: OS::Heat::SoftwareDeployment
    depends_on: deployment_b
    properties:
      input_values:
        previous: 'deployment_b'
      config:
        get_resource: config
      server:
        get_resource: server_a
  server_a:
    type: OS::Nova::Server
    properties:
      image:
        get_param: image
      flavor:
        get_param: flavor
      key_name:
        get_param: key_name
      user_data_format: SOFTWARE_CONFIG
  server_b:
    type: OS::Nova::Server
    properties:
      image:
        get_param: image
      flavor:
        get_param: flavor
      key_name:
        get_param: key_name
      user_data_format: SOFTWARE_CONFIG
outputs:
  deployment_a_stdout:
    value:
      get_attr: [deployment_a, deploy_stdout]
  deployment_b_stdout:
    value:
      get_attr: [deployment_b, deploy_stdout]
  deployment_c_stdout:
    value:
      get_attr: [deployment_c, deploy_stdout]