cluster-heat-stack.yaml

heat_template_version: 2015-10-15
description: template to deploy a cluster of webserver with manual scaling

parameters:
  cluster_size:
    type: number
    label: Cluster size
    description: Number of webserver instances in the cluster.
    default: 2
  public_network:
    type: string
    label: Public network name
    description: Network for floating IP
    default: provider-network
  private_network:
    type: string
    label: Private network name
    description: Network to attach the instance
    default: tenant-network
  private_subnet:
    type: string
    label: Private subnetwork name
    description: Subnet name
    default: tenant-subnetwork

resources:
  cluster:
    type: OS::Heat::ResourceGroup
    properties:
      count: { get_param: cluster_size }
      resource_def:
        type: OS::Nova::Server
        properties:
          image: ubuntu
          #image: cirros
          flavor: small
          key_name: demokey
          networks:
            - network: { get_param: private_network }
          user_data: |
            #!/bin/bash
            apt-get install apache2 -y
            echo "Hello "$(hostname -I)"!" > /var/www/html/index.html

  loadbalancer:
    type: OS::Neutron::LoadBalancer
    properties:
      members: { get_attr: [cluster, refs] }
      pool_id: { get_resource: pool }
      protocol_port: { get_attr: [pool, vip, protocol_port] }

  pool:
    type: OS::Neutron::Pool
    properties:
      lb_method: ROUND_ROBIN
      protocol: HTTP
      subnet: { get_param: private_subnet }
      vip: { "protocol_port": 80 }

  vip_floating_ip:
    type: OS::Neutron::FloatingIP
    properties:
      floating_network_id: { get_param: public_network }

  vip_floating_association:
    type: OS::Neutron::FloatingIPAssociation
    properties:
      floatingip_id: { get_resource: vip_floating_ip }
      port_id: { get_attr: [ pool, vip, port_id ] }
      fixed_ip_address: { get_attr: [ pool, vip, address ] }

outputs:
 floating_ip:
   description: Floating IP address assigned to the instance
   value: { get_attr: [vip_floating_ip, floating_ip_address] }