provision-elb-ec2-metric-alarm-playbook.yml

---
- hosts: localhost
  connection: local
  gather_facts: false

  vars:
   image: '{{ ami }}'
   architecture: 'workshop-elb-ec2-metric-alarm'
   loadb: '{{ architecture }}-lb'
   auto_sc:  '{{ architecture }}-asg'
   lc: '{{ architecture }}-lc'

  vars_files:
    - amiKeys.yml
    - regionInfo.yml

  tasks:
   - name: ELB
     ec2_elb_lb:
      scheme: internal
      aws_access_key: '{{ ami_access }}'
      aws_secret_key: '{{ ami_secret }}'
      name: '{{ loadb }}'
      region: '{{ regi }}'
      health_check:
        ping_protocol: http
        ping_port: 8080
        ping_path: '/health'
        response_timeout: 5
        interval: 60
        unhealthy_threshold: 2
        healthy_threshold: 2
      subnets: '{{ subnetID }}'
      security_group_ids: '{{ elb_security_group_ids }}'
      state: '{{ state }}'
      listeners:
       - protocol: http
         load_balancer_port: 80
         instance_port: 8080

   - name: Launch Configuration
     tags:
      - lc
     ec2_lc:
      aws_access_key: '{{ ami_access }}'
      aws_secret_key: '{{ ami_secret }}'
      region:  '{{regi}}'
      name: '{{lc}}'
      image_id: '{{ image }}'
      key_name: '{{ keypair }}'
      security_groups: '{{ group }}'
      instance_type: t2.micro
      volumes:
       - device_name: /dev/sda1
         volume_size: 100
         device_type: io1
         iops: 3000
         delete_on_termination: true
      user_data: '{{ bootstrap_content }}'
      state: '{{ state }}'

   - name: Autoscaling Group
     tags:
      - asg
     ec2_asg:
      aws_access_key: '{{ ami_access }}'
      aws_secret_key: '{{ ami_secret }}'
      region:  '{{ regi }}'
      name: '{{ auto_sc }}'
      load_balancers: '{{ loadb }}'
      launch_config_name: '{{ lc }}'
      min_size: 2
      max_size: 4
      desired_capacity: 2
      vpc_zone_identifier: '{{ subnetID }}'
      wait_for_instances: false
      health_check_period: 300
      health_check_type: ELB
      tags: '{{ tags }}'
      state: '{{ state }}'

   - name: Scaling Policy
     ec2_scaling_policy:
      aws_access_key: '{{ ami_access }}'
      aws_secret_key: '{{ ami_secret }}'
      region: '{{ regi }}'
      state: '{{ state }}'
      name: '{{item.pol_name }}'
      adjustment_type: 'ChangeInCapacity'
      asg_name: '{{ auto_sc }}'
      scaling_adjustment: '{{ item.changes }}'
      min_adjustment_step: 1
      cooldown: 300
     register: policies
     with_items:
      - pol_name: 'cpuUP_{{ auto_sc }}_policy'
        changes: +1
      - pol_name: 'cpuDown_{{ auto_sc }}_policy'
        changes: -1

   - name: Metric Alarms
     ec2_metric_alarm:
      aws_access_key: '{{ ami_access }}'
      aws_secret_key: '{{ ami_secret }}'
      state: '{{ state }}'
      region: '{{ regi }}'
      name: '{{ item.names }}'
      metric: 'CPUUtilization'
      namespace: 'AWS/EC2'
      statistic: Average
      comparison: '{{item.compare}}'
      threshold: '{{item.limits}}'
      period: 60
      evaluation_periods: 1
      unit: 'Percent'
      description: '{{ item.desc }}'
      dimensions: {'AutoScalingGroupName':'{{ auto_sc }}'}
      alarm_actions: '{{ item.pol }}'
     with_items:
      - names: 'cpuUP_{{ auto_sc }}'
        compare: '>='
        limits: '20.0'
        desc: 'This will alarm when the average cpu usage of the ASG is greater than 20% for 1 minute'
        pol: "{{ policies.results[0]['arn'] }}"
      - names: 'cpuDown_{{ auto_sc }}'
        compare: '<='
        limits: '10.0'
        desc: 'This will alarm when the average cpu usage of the ASG is less than 10% for 1 minute'
        pol: "{{ policies.results[1]['arn'] }}"