heat_template_version: 2014-10-16
description: A simple auto-scalable server, based on a gnocchi_aggregation_by_metrics_alarm.

resources:
  group:
    type: OS::Heat::AutoScalingGroup
    properties:
      cooldown: 60
      desired_capacity: 2
      max_size: 3
      min_size: 1
      resource:
       type: OS::Nova::Server
       properties:
         image: cirros-0.3.5-x86_64-disk
         flavor: m1.nano
         networks:
           - network: public
         key_name: scale

  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

  no_change_policy:
    type: OS::Heat::ScalingPolicy
    properties:
      adjustment_type: change_in_capacity
      auto_scaling_group_id: { get_resource: group }
      cooldown: 60
      scaling_adjustment: 0

  cpu_alarm_high:
    type: OS::Aodh::GnocchiAggregationByMetricsAlarm
    properties:
      metrics: [<LIST_OF_METRIC_IDS>]
      threshold: 1
      alarm_actions:
        - {get_attr: [scaleup_policy, alarm_url]}
      ok_actions:
        - {get_attr: [scaledown_policy, alarm_url]}
      insufficient_actions:
        - {get_attr: [no_change_policy, alarm_url]}
      comparison_operator: gt
      aggregation_method: mean