heat_template_version: 2013-05-23

description: Template that installs a cluster of servers with a load balancer.

parameters:
  image:
    type: string
    label: Image name or ID
    description: Image to be used for server. Please use an Ubuntu based image.
    default: trusty-server-cloudimg-amd64
  flavor:
    type: string
    label: Flavor
    description: Type of instance (flavor) to be used on the compute instance.
    default: m1.small
  key:
    type: string
    label: Key name
    description: Name of key-pair to be installed on the compute instance.
    default: my_key
  public_network:
    type: string
    label: Public network name or ID
    description: Public network to attach server to.
    default: public
  cluster_size:
    type: number
    label: Cluster size
    description: Number of instances in cluster.
    default: 2

resources:
  network:
    type: Lib::MSG::PrivateNetwork
    properties:
      public_network: { get_param: public_network }

  tiny_cluster:
    type: OS::Heat::ResourceGroup
    properties:
      count: { get_param: cluster_size }
      resource_def:
        type: Lib::MSG::Tiny
        properties:
          image: { get_param: image }
          flavor: { get_param: flavor }
          key: { get_param: key }
          private_network: { get_attr: [network, name] }

  load_balancer:
    type: Lib::MSG::HAProxy
    properties:
      image: { get_param: image }
      flavor: { get_param: flavor }
      key: { get_param: key }
      private_network: { get_attr: [network, name] }
      servers: { get_attr: [tiny_cluster, ip] }

  floating_ip:
    type: Lib::MSG::FloatingIP
    properties:
      port: { get_attr: [load_balancer, port] }
      public_network: { get_param: public_network }

outputs:
  ip:
    description: The public IP address to access the server.
    value: { get_attr: [floating_ip, ip] }