autoscale-heat-stack.yaml

heat_template_version: 2015-10-15
description: template to autoscale a simple instance

parameters:
  server_image:
    type: string
    label: Image name or ID
    description: Image to be used for compute instance
    default: cirros
  server_flavor:
    type: string
    label: Flavor
    description: Type of flavor to be used
    default: small
  server_key:
    type: string
    label: Key name
    description: Name of key-pair to be used for compute instance
    default: demokey
  server_network:
    type: string
    label: Private network name or ID
    description: Network to attach instance to.
    default: tenant-network

resources:
  group:
    type: OS::Heat::AutoScalingGroup
    properties:
      cooldown: 60
      desired_capacity: 1
      max_size: 5
      min_size: 1
      resource:
        type: OS::Nova::Server
        properties:
          image: { get_param: server_image }
          flavor: { get_param: server_flavor }
          key_name: { get_param: server_key }
          networks:
            - network: { get_param: server_network }

  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: 600
      evaluation_periods: 1
      threshold: 75
      alarm_actions:
        - {get_attr: [scaleup_policy, alarm_url]}
      comparison_operator: gt

  cpu_alarm_low:
    type: OS::Ceilometer::Alarm
    properties:
      meter_name: cpu_util
      statistic: avg
      period: 600
      evaluation_periods: 1
      threshold: 25
      alarm_actions:
        - {get_attr: [scaledown_policy, alarm_url]}
      comparison_operator: lt