heat_template_version: 2015-04-30

description: >
  Example of using mistral resources for autoscale testing. In this template
  workflows are used to get ip of the server and to load/release cpu and
  triggers allow to execute these workflows (every 10 minutes by default).

parameters:
  flavor:
    type: string
    default: m1.heat
    description: Name or ID of flavor

  image:
    type: string
    default: cirros-0.3.4-x86_64-uec
    description: Name or ID of image

  security_group_name:
    type: string

  user:
    type: string
    default: cirros
    description: User to access instances

  password:
    type: string
    default: 'cubswin:)'
    description: Password to access instances

  pattern_release:
    type: string
    default: "0,20,40 * * * *"
    description: Time to execute workflow wf_release_cpu

  pattern_load:
    type: string
    default: "10,30,50 * * * *"
    description: Time to execute workflow wf_load_cpu

  remaining_executions:
    type: number
    default: 3
    description: The number of occurrences after which the triggers should be deleted.

resources:
  my_asg:
    type: OS::Heat::AutoScalingGroup
    properties:
      resource:
        type: NovaNetwork::Server
        properties:
          image: { get_param: image }
          flavor: { get_param: flavor }
          security_group: {get_param: security_group_name}
          metadata: {"metering.stack": {get_param: "OS::stack_id"}}
      min_size: 1
      max_size: 2

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

  scale_down_policy:
    type: OS::Heat::ScalingPolicy
    properties:
      adjustment_type: change_in_capacity
      auto_scaling_group_id: {get_resource: my_asg}
      cooldown: 60
      scaling_adjustment: '-1'

  cpu_alarm_high:
    type: OS::Ceilometer::Alarm
    properties:
      description: Scale-up if the average CPU > 50% for 1 minute
      meter_name: cpu_util
      statistic: avg
      period: 60
      evaluation_periods: 1
      threshold: 50
      alarm_actions:
        - {get_attr: [scale_up_policy, alarm_url]}
      matching_metadata: {'metadata.user_metadata.stack': {get_param: "OS::stack_id"}}
      comparison_operator: gt

  cpu_alarm_low:
    type: OS::Ceilometer::Alarm
    properties:
      description: Scale-down if the average CPU < 15% for 1 minutes
      meter_name: cpu_util
      statistic: avg
      period: 60
      evaluation_periods: 1
      threshold: 15
      alarm_actions:
        - {get_attr: [scale_down_policy, alarm_url]}
      matching_metadata: {'metadata.user_metadata.stack': {get_param: "OS::stack_id"}}
      comparison_operator: lt

  wf_load_cpu:
    type: OS::Mistral::Workflow
    properties:
      type: direct
      tasks:
        - name: get_output
          action: heat.stacks_get stack_id=<% $.stack_id %>
          publish:
            vm_ip: <% $.get_output._info.outputs[0].output_value %>
          on_success:
            - run_ssh
        - name: run_ssh
          action: std.ssh cmd='cat /dev/urandom | gzip -9 > /dev/null &' host=<% $.vm_ip %> username=<% $.user %> password=<% $.password %>
      input: {'user': {get_param: user}, 'password': {get_param: password}, 'stack_id': {get_param: "OS::stack_id"}}

  wf_release_cpu:
    type: OS::Mistral::Workflow
    properties:
      type: direct
      tasks:
        - name: get_output
          action: heat.stacks_get stack_id=<% $.stack_id %>
          publish:
            vm_ip: <% $.get_output._info.outputs[0].output_value %>
          on_success:
            - run_ssh
        - name: run_ssh
          action: std.ssh cmd="kill -9 $(ps aux | grep 'cat /dev/urandom' | awk '{print $1}')" host=<% $.vm_ip %> username=<% $.user %> password=<% $.password %>
      input: {'user': {get_param: user}, 'password': {get_param: password}, 'stack_id': {get_param: "OS::stack_id"}}

  trigger_load_cpu:
    type: OS::Mistral::CronTrigger
    properties:
      count: {get_param: remaining_executions}
      pattern: {get_param: pattern_load}
      workflow: {get_attr: [wf_load_cpu, data]}

  trigger_release_cpu:
    type: OS::Mistral::CronTrigger
    properties:
      count: {get_param: remaining_executions}
      pattern: {get_param: pattern_release}
      workflow: {get_attr: [wf_release_cpu, data]}

outputs:
  servers_ips:
    value: {get_attr: [my_asg, outputs, ip]}

  next_load:
    value: {get_attr: [trigger_load_cpu, next_execution_time]}
    description: Time of the next execution of trigger_load_cpu

  next_release:
    value: {get_attr: [trigger_release_cpu, next_execution_time]}
    description: Time of the next execution of trigger_release_cpu