heat_template_version: 2014-10-16  

description: A simple auto scaling group.  

parameter_groups:
  label: configuration_data
  description: configuration of the instances.
  parameters:
    key_name:
      type: string
      description: Name of keypair to assign to servers
      default: userkey
    image:
      type: string
      description: Name of image to use for servers
      default: cirros
    flavor:
      type: string
      description: Flavor to use for servers
      default: m1.tiny
  label: network_parameters
  description: thse values are used to configure the load balancer and the instances.
  parameters:
    public_net_id:
      type: string
      description: ID of public network for which floating IP @ will be allocated
      default: 5bfc0aa4-cf22-486c-afae-34bf9032d8fc
    private_net_id:
      type: string
      description: ID of private network into which servers get deployed
      default: 8af8618c-8ae4-43b2-b58e-9f54b09343e1 
    private_subnet_id:
      type: string
      description: ID of private sub network into which servers get deployed
      default: 633dbac8-192a-4e69-8275-9562f84c081f

resources:
  group:
    type: OS::Heat::AutoScalingGroup
    properties:
      cooldown: 60
      desired_capacity: 1
      max_size: 3
      min_size: 1
      resource:
        type: OS::Nova::Server::Cirros

  scaleup_policy:
    type: OS::Heat::ScalingPolicy
    properties:
      adjustment_type: change_in_capacity
      auto_scaling_group_id: { get_resource: group }
      cooldown: 60
      scaling_adjustment: 1

  scaledown_policy:
    type: OS::Heat::ScalingPolicy
    properties:
      adjustment_type: change_in_capacity
      auto_scaling_group_id: { get_resource: group }
      cooldown: 60
      scaling_adjustment: -1

  cpu_alarm_high:
    type: OS::Ceilometer::Alarm
    properties:
      meter_name: cpu_util
      statistic: avg
      period: 60
      evaluation_periods: 1
      threshold: 50
      alarm_actions:
        - {get_attr: [scaleup_policy, alarm_url]}
      comparison_operator: gt
      matching_metadata: {'metadata.user_metadata.stack': {get_param: "OS::stack_id"}}

  cpu_alarm_low:
    type: OS::Ceilometer::Alarm
    properties:
      meter_name: cpu_util
      statistic: avg
      period: 60
      evaluation_periods: 1
      threshold: 15
      alarm_actions:
        - {get_attr: [scaledown_policy, alarm_url]}
      comparison_operator: lt
      matching_metadata: {'metadata.user_metadata.stack': {get_param: "OS::stack_id"}}

  lb_vip_port:
    type: OS::Neutron::Port
    properties:
      network_id: { get_param: private_net_id }
      fixed_ips:
        - subnet_id: { get_param: private_subnet_id }

  lb_vip_floating_ip:
    type: OS::Neutron::FloatingIP
    properties:
      floating_network_id: { get_param: public_net_id }
      port_id: { get_resource: lb_vip_port }

  lb_pool_vip:
    type: OS::Neutron::FloatingIPAssociation
    properties:
      floating_id: { get_resource: lb_vip_floating_ip }
      port_id: { 'Fn::Select': ['port_id', {get_attr: [pool, vip]}]}

  monitor:
    type: OS::Neutron::HealthMonitor
    properties:
      type: TCP
      delay: 3
      max_retries: 5
      timout: 5

  pool:
    type: OS::Neutron::Pool
    properties:
      #admin_state_up: Boolean
      description: String
      lb_method: LEAST_CONNECTIONS
      protocol: TCP
      subnet_id: {get_param: private_subnet_id}
      vip:
        protocol_port: 80

  lb:
    type: OS::Neutron::LoadBalancer
    properties:
      protocol_port: 80
      pool_id: {get_resource: pool}