heat_template_version: 2013-05-23
description: >
    Template to create multiple instances.

parameters:
  image_id:
    type: string
    description: Image used for servers
  key_name:
    type: string
    description: Name of SSH key to connect to the servers
  instance_type:
    type: string
    description: flavor used by the servers
    default: m1.small
    constraints:
      - custom_constraint: nova.flavor
  num_instances:
    type: number
    description: Number of instances to create
    default: 1

resources:
  server_group:
    type: OS::Heat::InstanceGroup
    properties:
      LaunchConfigurationName: { get_resource: server_config }
      AvailabilityZones: []
      Size: { get_param: num_instances }
  server_config:
    type: AWS::AutoScaling::LaunchConfiguration
    properties:
      ImageId: { get_param: image_id }
      InstanceType: { get_param: instance_type}
      KeyName: { get_param: key_name }

outputs:
  server_group_addresses:
    value: { get_attr: [server_group, InstanceList] }