Now, we're going to create an AMI (Amazon Machine Image) out of our workstation after it's configured, then create a launch configuration pointing at that AMI. Then, we'll create an autoscaling group that points at the launch configuration.

After our workstation role has fully configured the instance, we are going to add a role to create an AMI by snapshotting our running instance.

roles/create-ami/tasks/main.yml:

---
# roles/create-ami/tasks/main.yml
- name: Create AMI
  ec2_ami:
    region: "{{ region }}"
    instance_id: "{{ ec2.instance_ids[0] }}"
    name: "{{ asg_name }}-{{ ansible_date_time.iso8601 | regex_replace('[^a-zA-Z0-9]', '-') }}"
    wait: yes
    wait_timeout: 1200
    state: present
  register: ami

The following create-launch-config role allow us to create a launch configuration that points at the AMI we just created. This is a necessary before we can create the autoscaling group.

roles/create-launch-config/tasks/main.yml:

---
# roles/create-launch-config/tasks/main.yml
 
- name: Create Launch Configuration
  ec2_lc:
    region: "{{ region }}"
    name: "{{ asg_name }}-{{ ansible_date_time.iso8601 | regex_replace('[^a-zA-Z0-9]', '-') }}"
    image_id: "{{ ami.image_id }}"
    key_name: "{{ keypair }}"
    instance_type: "{{ instance_type }}"
    instance_profile_name: "{{ iam_profile }}"
    security_groups: "{{ security_groups }}"
    volumes: "{{ volumes }}"
    instance_monitoring: yes
  register: lc_result
 
- debug: var=lc_result

First, we'll create a launch configuration that points at the AMI we just created. This is a necessary before we can create the autoscaling group.

Then, we're going to create is the role that actually creates the autoscaling group.

This role first checks to see if an Auto Scaling group with the same name already exists, and if so, it just updates it.

By updating the Auto Scaling group to point at the new launch configuration, with a new AMI, the Auto Scaling group will automatically do a rolling upgrade, where it starts a new instance, waits until the OS is loaded and healthy, then terminates an old instance. It repeats this process until all instances in the Auto Scaling group are running the new AMI.

We can configure this by changing replace_batch_size, however, we've set a sensible default based on the size of the group divided by 4. For example, if you had an Auto Scaling group with 8 running instances, Auto Scaling would deploy 2 new instances at once, to speed up the rolling upgrade process.

roles/auto-scaling/tasks/main.yml:

---
# roles/auto-scaling/tasks/main.yml

- name: Create Launch Configuration
  ec2_lc:
    region: "{{ region }}"
    name: "{{ asg_name }}-{{ ansible_date_time.iso8601 | regex_replace('[^a-zA-Z0-9]', '-') }}"
    image_id: "{{ ami.image_id }}"
    key_name: "{{ keypair }}"
    instance_type: "{{ instance_type }}"
    instance_profile_name: "{{ iam_profile }}"
    security_groups: "{{ security_groups }}"
    volumes: "{{ volumes }}"
    instance_monitoring: yes
  register: lc_result

- name: Retrieve current Auto Scaling Group properties
  command: "aws --region {{ region }} autoscaling describe-auto-scaling-groups --auto-scaling-group-names {{ asg_name }}"
  register: asg_properties_result
 
- name: Set asg_properties variable from JSON output if the Auto Scaling Group already exists
  set_fact:
    asg_properties: "{{ (asg_properties_result.stdout | from_json).AutoScalingGroups[0] }}"
  when: (asg_properties_result.stdout | from_json).AutoScalingGroups | count
 
- name: Configure Auto Scaling Group and perform rolling deploy
  ec2_asg:
    region: "{{ region }}"
    name: "{{ asg_name }}"
    launch_config_name: "{{ lc_result.name }}"
    availability_zones: "{{ zone }}"
    health_check_type: EC2
    health_check_period: 300
#    desired_capacity: "{{ asg_properties_result.DesiredCapacity | default(2) }}"
    desired_capacity: "{{ instances_min }}"
    replace_all_instances: yes
    replace_batch_size: "{{ (asg_properties_result.DesiredCapacity | default(2) / 4) | round(0, 'ceil') | int }}"
    min_size: "{{ instances_min }}"
    max_size: "{{ instances_max }}"
    tags:
     - Name: "{{ asg_name }}"
#    load_balancers:
#      - master
    state: present
  register: asg_result
 
- debug: var=asg_result
 
- name: Configure Scaling Policies
  ec2_scaling_policy:
    region: "{{ region }}"
    name: "{{ item.name }}"
    asg_name: "{{ asg_name }}"
    state: present
    adjustment_type: "{{ item.adjustment_type }}"
    min_adjustment_step: "{{ item.min_adjustment_step }}"
    scaling_adjustment: "{{ item.scaling_adjustment }}"
    cooldown: "{{ item.cooldown }}"
  with_items:
    - name: "Increase Group Size"
      adjustment_type: "ChangeInCapacity"
      scaling_adjustment: +1
      min_adjustment_step: 1
      cooldown: 180
    - name: "Decrease Group Size"
      adjustment_type: "ChangeInCapacity"
      scaling_adjustment: -1
      min_adjustment_step: 1
      cooldown: 300
  register: sp_result
 
- name: Determine Metric Alarm configuration
  set_fact:
    metric_alarms:
      - name: "{{ asg_result.name }}-ScaleUp"
        comparison: ">="
        threshold: 50.0
        alarm_actions:
          - "{{ sp_result.results[0].arn }}"
      - name: "{{ asg_result.name }}-ScaleDown"
        comparison: "<="
        threshold: 20.0
        alarm_actions:
          - "{{ sp_result.results[1].arn }}"
 
- name: Configure Metric Alarms and link to Scaling Policies
  ec2_metric_alarm:
    region: "{{ region }}"
    name: "{{ item.name }}"
    state: present
    metric: "CPUUtilization"
    namespace: "AWS/EC2"
    statistic: "Average"
    comparison: "{{ item.comparison }}"
    threshold: "{{ item.threshold }}"
    period: 60
    evaluation_periods: 5
    unit: "Percent"
    dimensions:
      AutoScalingGroupName: "{{ asg_result.name }}"
    alarm_actions: "{{ item.alarm_actions }}"
  with_items: metric_alarms
  when: "{{ asg_result.max_size }} > 1"
  register: ma_result

If it's creating a new Auto Scaling group, it also sets some CloudWatch metric alarms based on CPU utilization, and links the metric alarms to the scaling policies. The way we set these alarms, if average CPU utilization is greater than 50% for 5 minutes, the group will scale up by adding another instance. If average CPU utilization is less than 20% for 5 minutes, the group will scale down by terminating an instance.

There are also some cooldown times set so that this doesn't happen too often; scaling up can only happen every 3 minutes, and scaling down can only happen every 5 minutes.

Here is our updated deploy play located in the root of our playbook folder. This new site_final.yml play should look like this:

---
# site-final.yml
  - hosts: localhost
    connection: local
    gather_facts: no
    roles:
      - role: launch
        name: "{{ group_name }}amibuild"

  - hosts: "{{ group_name }}amibuild"
    become: True
    become_user: root
    become_method: sudo
    roles:
      - workstation

  - hosts: localhost
    connection: local
    gather_facts: no
    roles:
      - { role: create-ami, asg_name: "{{ group_name }}" }
      - { role: create-launch-config, asg_name: "{{ group_name }}" }
      - { role: auto-scaling, asg_name: "{{ group_name }}", instances_max: 1 }

  #- hosts: localhost
  #  connection: local
  #  gather_facts: no
  #  roles:
  #    - { role: delete-old-launch-configurations, asg_name: "{{ group_name }}" }
  #    - { role: delete-old-amis, asg_name: "{{ group_name }}" }

  #- hosts: "{{ group_name }}amibuild"
  #  connection: local
  #  gather_facts: no
  #  roles:
  #    - terminate

Here is the file (roles/delete-old-launch-configurations/tasks/main.yml):

---
# roles/delete-old-launch-configurations/tasks/main.yml
 
- lc_find:
    region: "{{ region }}"
    name_regex: "{{ asg_name }}-.*"
    sort: yes
    sort_end: -5
  register: old_lc_result
 
- ec2_lc:
    region: "{{ region }}"
    name: "{{ item.name }}"
    state: absent
  with_items: old_lc_result.results
  ignore_errors: yes

This role also requires a python script (roles/delete-old-launch-configurations/library/lc_find.py):

#!/usr/bin/python

# roles/delete-old-launch-configurations/library/lc_find.py

import json
import subprocess

def main():
    argument_spec = ec2_argument_spec()
    argument_spec.update(dict(
            region = dict(required=True,
                aliases = ['aws_region', 'ec2_region']),
            name_regex = dict(required=False),
            sort = dict(required=False, default=None, type='bool'),
            sort_order = dict(required=False, default='ascending',
                choices=['ascending', 'descending']),
            sort_start = dict(required=False),
            sort_end = dict(required=False),
        )
    )
    module = AnsibleModule(
        argument_spec=argument_spec,
    )
    name_regex = module.params.get('name_regex')
    sort = module.params.get('sort')
    sort_order = module.params.get('sort_order')
    sort_start = module.params.get('sort_start')
    sort_end = module.params.get('sort_end')
    lc_cmd_result = subprocess.check_output(["aws", "autoscaling", "describe-launch-configurations", "--region",  module.params.get('region')])
    lc_result = json.loads(lc_cmd_result)
    results = []
    for lc in lc_result['LaunchConfigurations']:
        data = {
            'arn': lc["LaunchConfigurationARN"],
            'name': lc["LaunchConfigurationName"],
        }
        results.append(data)
    if name_regex:
        regex = re.compile(name_regex)
        results = [result for result in results if regex.match(result['name'])]
    if sort:
        results.sort(key=lambda e: e['name'], reverse=(sort_order=='descending'))
    try:
        if sort and sort_start and sort_end:
            results = results[int(sort_start):int(sort_end)]
        elif sort and sort_start:
            results = results[int(sort_start):]
        elif sort and sort_end:
            results = results[:int(sort_end)]
    except TypeError:
        module.fail_json(msg="Please supply numeric values for sort_start and/or sort_end")
    module.exit_json(results=results)

from ansible.module_utils.basic import *
from ansible.module_utils.ec2 import *

if __name__ == '__main__':
    main()

This role simply deletes any AMIs other than the 5 most recently created ones for the particular autoscaling group we are deploying.

:

---
# roles/delete-old-amis/tasks/main.yml
 
- ec2_ami_find:
    region: "{{ region }}"
    owner: self
    name: "{{ asg_name }}-*"
    sort: name
    sort_end: -5
  register: old_ami_result
 
- ec2_ami:
    region: "{{ region }}"
    image_id: "{{ item.ami_id }}"
    delete_snapshot: yes
    state: absent
  with_items: old_ami_result.results
  ignore_errors: yes

Now that we've captured the AMI snapshot of our fully configured system, created a launch config, and created an Auto Scaling group based on it, we no longer need our temporary "amibuild" system. This role will terminate it.

roles/terminate/tasks/main.yml:

---
# roles/terminate/tasks/main.yml
- name: Terminate old instance(s)
  ec2:
    instance_ids: "{{ ec2_id }}"
    region: "{{ region }}"
    state: absent
    wait: yes

Here is the output when we run the playbook (skipped majority of package installations in workstation role):

k@laptop:~/bogo$ eval `ssh-agent`

k@laptop:~/bogo$ ssh-add ~/.ssh/autoscaling.pem
Identity added: /home/k/.ssh/autoscaling.pem (/home/k/.ssh/autoscaling.pem)

k@laptop:~/bogo$ ansible-playbook -vv -e group_name=test site-final.yml
Using /home/k/bogo/ansible.cfg as config file
 [WARNING]: provided hosts list is empty, only localhost is available

5 plays in site-final.yml

PLAY ***************************************************************************

TASK [launch : Search for the latest Ubuntu 14.04 AMI] *************************
ok: [localhost] => {"changed": false, "results": [{"ami_id": "ami-e5bf05f3", "architecture": "x86_64", "block_device_mapping": {"/dev/sda1": {"delete_on_termination": true, "encrypted": false, "size": 8, "snapshot_id": "snap-052d62986f51e13b9", "volume_type": "gp2"}, "/dev/sdb": {"delete_on_termination": false, "encrypted": null, "size": null, "snapshot_id": null, "volume_type": null}, "/dev/sdc": {"delete_on_termination": false, "encrypted": null, "size": null, "snapshot_id": null, "volume_type": null}}, "creationDate": "2017-03-30T23:48:12.000Z", "description": null, "hypervisor": "xen", "is_public": true, "location": "099720109477/ubuntu/images/hvm-ssd/ubuntu-trusty-14.04-amd64-server-20170330", "name": "ubuntu/images/hvm-ssd/ubuntu-trusty-14.04-amd64-server-20170330", "owner_id": "099720109477", "platform": null, "root_device_name": "/dev/sda1", "root_device_type": "ebs", "state": "available", "tags": {}, "virtualization_type": "hvm"}]}

TASK [launch : Launch new instance] ********************************************
changed: [localhost] => {"changed": true, "instance_ids": ["i-0f55d61570fb6af45"], "instances": [{"ami_launch_index": "0", "architecture": "x86_64", "block_device_mapping": {"/dev/sda1": {"delete_on_termination": true, "status": "attached", "volume_id": "vol-0ec625fad763c77d9"}}, "dns_name": "ec2-34-205-9-162.compute-1.amazonaws.com", "ebs_optimized": false, "groups": {"sg-22897246": "default"}, "hypervisor": "xen", "id": "i-0f55d61570fb6af45", "image_id": "ami-e5bf05f3", "instance_type": "t2.nano", "kernel": null, "key_name": "autoscaling", "launch_time": "2017-04-04T22:16:16.000Z", "placement": "us-east-1a", "private_dns_name": "ip-172-31-65-27.ec2.internal", "private_ip": "172.31.65.27", "public_dns_name": "ec2-34-205-9-162.compute-1.amazonaws.com", "public_ip": "34.205.9.162", "ramdisk": null, "region": "us-east-1", "root_device_name": "/dev/sda1", "root_device_type": "ebs", "state": "running", "state_code": 16, "tags": {"Name": "testamibuild"}, "tenancy": "default", "virtualization_type": "hvm"}], "tagged_instances": []}

TASK [launch : Add new instances to host group] ********************************
creating host via 'add_host': hostname=ec2-34-205-9-162.compute-1.amazonaws.com
changed: [localhost] => (item={u'kernel': None, u'root_device_type': u'ebs', u'private_dns_name': u'ip-172-31-65-27.ec2.internal', u'public_ip': u'34.205.9.162', u'private_ip': u'172.31.65.27', u'id': u'i-0f55d61570fb6af45', u'ebs_optimized': False, u'state': u'running', u'virtualization_type': u'hvm', u'architecture': u'x86_64', u'ramdisk': None, u'block_device_mapping': {u'/dev/sda1': {u'status': u'attached', u'delete_on_termination': True, u'volume_id': u'vol-0ec625fad763c77d9'}}, u'key_name': u'autoscaling', u'image_id': u'ami-e5bf05f3', u'tenancy': u'default', u'groups': {u'sg-22897246': u'default'}, u'public_dns_name': u'ec2-34-205-9-162.compute-1.amazonaws.com', u'state_code': 16, u'tags': {u'Name': u'testamibuild'}, u'placement': u'us-east-1a', u'ami_launch_index': u'0', u'dns_name': u'ec2-34-205-9-162.compute-1.amazonaws.com', u'region': u'us-east-1', u'launch_time': u'2017-04-04T22:16:16.000Z', u'instance_type': u't2.nano', u'root_device_name': u'/dev/sda1', u'hypervisor': u'xen'}) => {"add_host": {"groups": ["testamibuild"], "host_name": "ec2-34-205-9-162.compute-1.amazonaws.com", "host_vars": {"ec2_id": "i-0f55d61570fb6af45"}}, "changed": true, "item": {"ami_launch_index": "0", "architecture": "x86_64", "block_device_mapping": {"/dev/sda1": {"delete_on_termination": true, "status": "attached", "volume_id": "vol-0ec625fad763c77d9"}}, "dns_name": "ec2-34-205-9-162.compute-1.amazonaws.com", "ebs_optimized": false, "groups": {"sg-22897246": "default"}, "hypervisor": "xen", "id": "i-0f55d61570fb6af45", "image_id": "ami-e5bf05f3", "instance_type": "t2.nano", "kernel": null, "key_name": "autoscaling", "launch_time": "2017-04-04T22:16:16.000Z", "placement": "us-east-1a", "private_dns_name": "ip-172-31-65-27.ec2.internal", "private_ip": "172.31.65.27", "public_dns_name": "ec2-34-205-9-162.compute-1.amazonaws.com", "public_ip": "34.205.9.162", "ramdisk": null, "region": "us-east-1", "root_device_name": "/dev/sda1", "root_device_type": "ebs", "state": "running", "state_code": 16, "tags": {"Name": "testamibuild"}, "tenancy": "default", "virtualization_type": "hvm"}}

TASK [launch : Wait for instance to boot] **************************************
ok: [localhost] => (item={u'kernel': None, u'root_device_type': u'ebs', u'private_dns_name': u'ip-172-31-65-27.ec2.internal', u'public_ip': u'34.205.9.162', u'private_ip': u'172.31.65.27', u'id': u'i-0f55d61570fb6af45', u'ebs_optimized': False, u'state': u'running', u'virtualization_type': u'hvm', u'architecture': u'x86_64', u'ramdisk': None, u'block_device_mapping': {u'/dev/sda1': {u'status': u'attached', u'delete_on_termination': True, u'volume_id': u'vol-0ec625fad763c77d9'}}, u'key_name': u'autoscaling', u'image_id': u'ami-e5bf05f3', u'tenancy': u'default', u'groups': {u'sg-22897246': u'default'}, u'public_dns_name': u'ec2-34-205-9-162.compute-1.amazonaws.com', u'state_code': 16, u'tags': {u'Name': u'testamibuild'}, u'placement': u'us-east-1a', u'ami_launch_index': u'0', u'dns_name': u'ec2-34-205-9-162.compute-1.amazonaws.com', u'region': u'us-east-1', u'launch_time': u'2017-04-04T22:16:16.000Z', u'instance_type': u't2.nano', u'root_device_name': u'/dev/sda1', u'hypervisor': u'xen'}) => {"changed": false, "elapsed": 31, "item": {"ami_launch_index": "0", "architecture": "x86_64", "block_device_mapping": {"/dev/sda1": {"delete_on_termination": true, "status": "attached", "volume_id": "vol-0ec625fad763c77d9"}}, "dns_name": "ec2-34-205-9-162.compute-1.amazonaws.com", "ebs_optimized": false, "groups": {"sg-22897246": "default"}, "hypervisor": "xen", "id": "i-0f55d61570fb6af45", "image_id": "ami-e5bf05f3", "instance_type": "t2.nano", "kernel": null, "key_name": "autoscaling", "launch_time": "2017-04-04T22:16:16.000Z", "placement": "us-east-1a", "private_dns_name": "ip-172-31-65-27.ec2.internal", "private_ip": "172.31.65.27", "public_dns_name": "ec2-34-205-9-162.compute-1.amazonaws.com", "public_ip": "34.205.9.162", "ramdisk": null, "region": "us-east-1", "root_device_name": "/dev/sda1", "root_device_type": "ebs", "state": "running", "state_code": 16, "tags": {"Name": "testamibuild"}, "tenancy": "default", "virtualization_type": "hvm"}, "path": null, "port": 22, "search_regex": null, "state": "started"}

PLAY ***************************************************************************

TASK [setup] *******************************************************************
ok: [ec2-34-205-9-162.compute-1.amazonaws.com]

TASK [workstation : add timezone configuration] ********************************
changed: [ec2-34-205-9-162.compute-1.amazonaws.com] => {"changed": true, "cmd": ["bash", "-c", "echo US/Eastern > /etc/timezone"], "delta": "0:00:00.001982", "end": "2017-04-04 22:17:25.651955", "rc": 0, "start": "2017-04-04 22:17:25.649973", "stderr": "", "stdout": "", "stdout_lines": [], "warnings": []}

PLAY ***************************************************************************

TASK [setup] *******************************************************************
ok: [localhost]

TASK [create-ami : Create AMI] *************************************************
changed: [localhost] => {"changed": true, "image_id": "ami-8bdf5f9d", "msg": "AMI creation operation complete", "state": "available"}

TASK [create-launch-config : Create Launch Configuration] **********************
changed: [localhost] => {"arn": "arn:aws:autoscaling:us-east-1:526262051452:launchConfiguration:fa0ba6bc-fed8-4664-8374-d0ccdb14c561:launchConfigurationName/test-2017-04-04T22-17-28Z", "changed": true, "created_time": "2017-04-04 22:18:57.768000", "image_id": "ami-8bdf5f9d", "instance_type": "t2.nano", "name": "test-2017-04-04T22-17-28Z", "result": {"associate_public_ip_address": null, "block_device_mappings": [{"device_name": "/dev/sda1", "ebs": {"snapshot_id": null, "volume_size": "8"}, "virtual_name": null}], "classic_link_vpc_id": null, "classic_link_vpc_security_groups": [], "created_time": "2017-04-04 22:18:57.768000", "delete_on_termination": true, "ebs_optimized": false, "image_id": "ami-8bdf5f9d", "instance_monitoring": true, "instance_profile_name": "noaccess", "instance_type": "t2.nano", "iops": null, "kernel_id": "", "key_name": "autoscaling", "launch_configuration_arn": "arn:aws:autoscaling:us-east-1:526262051452:launchConfiguration:fa0ba6bc-fed8-4664-8374-d0ccdb14c561:launchConfigurationName/test-2017-04-04T22-17-28Z", "member": "\n      ", "name": "test-2017-04-04T22-17-28Z", "ramdisk_id": "", "security_groups": ["default"], "spot_price": null, "use_block_device_types": false, "user_data": "", "volume_type": null}, "security_groups": ["default"]}

TASK [create-launch-config : debug] ********************************************
ok: [localhost] => {
    "lc_result": {
        "arn": "arn:aws:autoscaling:us-east-1:526262051452:launchConfiguration:fa0ba6bc-fed8-4664-8374-d0ccdb14c561:launchConfigurationName/test-2017-04-04T22-17-28Z", 
        "changed": true, 
        "created_time": "2017-04-04 22:18:57.768000", 
        "image_id": "ami-8bdf5f9d", 
        "instance_type": "t2.nano", 
        "name": "test-2017-04-04T22-17-28Z", 
        "result": {
            "associate_public_ip_address": null, 
            "block_device_mappings": [
                {
                    "device_name": "/dev/sda1", 
                    "ebs": {
                        "snapshot_id": null, 
                        "volume_size": "8"
                    }, 
                    "virtual_name": null
                }
            ], 
            "classic_link_vpc_id": null, 
            "classic_link_vpc_security_groups": [], 
            "created_time": "2017-04-04 22:18:57.768000", 
            "delete_on_termination": true, 
            "ebs_optimized": false, 
            "image_id": "ami-8bdf5f9d", 
            "instance_monitoring": true, 
            "instance_profile_name": "noaccess", 
            "instance_type": "t2.nano", 
            "iops": null, 
            "kernel_id": "", 
            "key_name": "autoscaling", 
            "launch_configuration_arn": "arn:aws:autoscaling:us-east-1:526262051452:launchConfiguration:fa0ba6bc-fed8-4664-8374-d0ccdb14c561:launchConfigurationName/test-2017-04-04T22-17-28Z", 
            "member": "\n      ", 
            "name": "test-2017-04-04T22-17-28Z", 
            "ramdisk_id": "", 
            "security_groups": [
                "default"
            ], 
            "spot_price": null, 
            "use_block_device_types": false, 
            "user_data": "", 
            "volume_type": null
        }, 
        "security_groups": [
            "default"
        ]
    }
}

TASK [auto-scaling : Retrieve current Auto Scaling Group properties] ***********
changed: [localhost] => {"changed": true, "cmd": ["aws", "--region", "us-east-1", "autoscaling", "describe-auto-scaling-groups", "--auto-scaling-group-names", "test"], "delta": "0:00:04.689517", "end": "2017-04-04 15:19:03.266688", "rc": 0, "start": "2017-04-04 15:18:58.577171", "stderr": "", "stdout": "{\n    \"AutoScalingGroups\": []\n}", "stdout_lines": ["{", "    \"AutoScalingGroups\": []", "}"], "warnings": []}

TASK [auto-scaling : Set asg_properties variable from JSON output if the Auto Scaling Group already exists] ***
skipping: [localhost] => {"changed": false, "skip_reason": "Conditional check failed", "skipped": true}

TASK [auto-scaling : Configure Auto Scaling Group and perform rolling deploy] **
changed: [localhost] => {"availability_zones": ["us-east-1a"], "changed": true, "default_cooldown": 300, "desired_capacity": 1, "health_check_period": 300, "health_check_type": "EC2", "healthy_instances": 1, "in_service_instances": 1, "instance_facts": {"i-0cc64e3642c26f75d": {"health_status": "Healthy", "launch_config_name": "test-2017-04-04T22-17-28Z", "lifecycle_state": "InService"}}, "instances": ["i-0cc64e3642c26f75d"], "launch_config_name": "test-2017-04-04T22-17-28Z", "load_balancers": [], "max_size": 1, "min_size": 1, "name": "test", "pending_instances": 0, "placement_group": null, "tags": {"Name": "test"}, "terminating_instances": 0, "termination_policies": ["Default"], "unhealthy_instances": 0, "viable_instances": 1, "vpc_zone_identifier": ""}

TASK [auto-scaling : debug] ****************************************************
ok: [localhost] => {
    "asg_result": {
        "availability_zones": [
            "us-east-1a"
        ], 
        "changed": true, 
        "default_cooldown": 300, 
        "desired_capacity": 1, 
        "health_check_period": 300, 
        "health_check_type": "EC2", 
        "healthy_instances": 1, 
        "in_service_instances": 1, 
        "instance_facts": {
            "i-0cc64e3642c26f75d": {
                "health_status": "Healthy", 
                "launch_config_name": "test-2017-04-04T22-17-28Z", 
                "lifecycle_state": "InService"
            }
        }, 
        "instances": [
            "i-0cc64e3642c26f75d"
        ], 
        "launch_config_name": "test-2017-04-04T22-17-28Z", 
        "load_balancers": [], 
        "max_size": 1, 
        "min_size": 1, 
        "name": "test", 
        "pending_instances": 0, 
        "placement_group": null, 
        "tags": {
            "Name": "test"
        }, 
        "terminating_instances": 0, 
        "termination_policies": [
            "Default"
        ], 
        "unhealthy_instances": 0, 
        "viable_instances": 1, 
        "vpc_zone_identifier": ""
    }
}

TASK [auto-scaling : Configure Scaling Policies] *******************************
changed: [localhost] => (item={u'cooldown': 180, u'min_adjustment_step': 1, u'name': u'Increase Group Size', u'adjustment_type': u'ChangeInCapacity', u'scaling_adjustment': 1}) => {"adjustment_type": "ChangeInCapacity", "arn": "arn:aws:autoscaling:us-east-1:526262051452:scalingPolicy:f79610a9-f6f0-458f-8135-40c8f059baf1:autoScalingGroupName/test:policyName/Increase Group Size", "as_name": "test", "changed": true, "cooldown": 180, "item": {"adjustment_type": "ChangeInCapacity", "cooldown": 180, "min_adjustment_step": 1, "name": "Increase Group Size", "scaling_adjustment": 1}, "min_adjustment_step": null, "name": "Increase Group Size", "scaling_adjustment": 1}
changed: [localhost] => (item={u'cooldown': 300, u'min_adjustment_step': 1, u'name': u'Decrease Group Size', u'adjustment_type': u'ChangeInCapacity', u'scaling_adjustment': -1}) => {"adjustment_type": "ChangeInCapacity", "arn": "arn:aws:autoscaling:us-east-1:526262051452:scalingPolicy:be2141aa-dc6e-4d84-8a07-61942d0c0d26:autoScalingGroupName/test:policyName/Decrease Group Size", "as_name": "test", "changed": true, "cooldown": 300, "item": {"adjustment_type": "ChangeInCapacity", "cooldown": 300, "min_adjustment_step": 1, "name": "Decrease Group Size", "scaling_adjustment": -1}, "min_adjustment_step": null, "name": "Decrease Group Size", "scaling_adjustment": -1}

TASK [auto-scaling : Determine Metric Alarm configuration] *********************
ok: [localhost] => {"ansible_facts": {"metric_alarms": [{"alarm_actions": ["arn:aws:autoscaling:us-east-1:526262051452:scalingPolicy:f79610a9-f6f0-458f-8135-40c8f059baf1:autoScalingGroupName/test:policyName/Increase Group Size"], "comparison": ">=", "name": "test-ScaleUp", "threshold": 50.0}, {"alarm_actions": ["arn:aws:autoscaling:us-east-1:526262051452:scalingPolicy:be2141aa-dc6e-4d84-8a07-61942d0c0d26:autoScalingGroupName/test:policyName/Decrease Group Size"], "comparison": "<=", "name": "test-ScaleDown", "threshold": 20.0}]}, "changed": false}

TASK [auto-scaling : Configure Metric Alarms and link to Scaling Policies] *****
skipping: [localhost] => (item={u'threshold': 50.0, u'comparison': u'>=', u'alarm_actions': [u'arn:aws:autoscaling:us-east-1:526262051452:scalingPolicy:f79610a9-f6f0-458f-8135-40c8f059baf1:autoScalingGroupName/test:policyName/Increase Group Size'], u'name': u'test-ScaleUp'})  => {"changed": false, "item": {"alarm_actions": ["arn:aws:autoscaling:us-east-1:526262051452:scalingPolicy:f79610a9-f6f0-458f-8135-40c8f059baf1:autoScalingGroupName/test:policyName/Increase Group Size"], "comparison": ">=", "name": "test-ScaleUp", "threshold": 50.0}, "skip_reason": "Conditional check failed", "skipped": true}
skipping: [localhost] => (item={u'threshold': 20.0, u'comparison': u'<=', u'alarm_actions': [u'arn:aws:autoscaling:us-east-1:526262051452:scalingPolicy:be2141aa-dc6e-4d84-8a07-61942d0c0d26:autoScalingGroupName/test:policyName/Decrease Group Size'], u'name': u'test-ScaleDown'})  => {"changed": false, "item": {"alarm_actions": ["arn:aws:autoscaling:us-east-1:526262051452:scalingPolicy:be2141aa-dc6e-4d84-8a07-61942d0c0d26:autoScalingGroupName/test:policyName/Decrease Group Size"], "comparison": "<=", "name": "test-ScaleDown", "threshold": 20.0}, "skip_reason": "Conditional check failed", "skipped": true}

PLAY ***************************************************************************

TASK [delete-old-launch-configurations : lc_find] ******************************
ok: [localhost] => {"changed": false, "results": []}

TASK [delete-old-launch-configurations : ec2_lc] *******************************

TASK [delete-old-amis : ec2_ami_find] ******************************************
ok: [localhost] => {"changed": false, "results": [{"ami_id": "ami-ae33b2b8", "architecture": "x86_64", "block_device_mapping": {"/dev/sda1": {"delete_on_termination": true, "encrypted": false, "size": 8, "snapshot_id": "snap-6d9288d9", "volume_type": "gp2"}, "/dev/sdb": {"delete_on_termination": false, "encrypted": null, "size": null, "snapshot_id": null, "volume_type": null}, "/dev/sdc": {"delete_on_termination": false, "encrypted": null, "size": null, "snapshot_id": null, "volume_type": null}}, "creationDate": "2017-04-04T18:08:36.000Z", "description": null, "hypervisor": "xen", "is_public": false, "location": "526262051452/test-2017-04-04T18-08-34Z", "name": "test-2017-04-04T18-08-34Z", "owner_id": "526262051452", "platform": null, "root_device_name": "/dev/sda1", "root_device_type": "ebs", "state": "available", "tags": {}, "virtualization_type": "hvm"}, {"ami_id": "ami-ac37b6ba", "architecture": "x86_64", "block_device_mapping": {"/dev/sda1": {"delete_on_termination": true, "encrypted": false, "size": 8, "snapshot_id": "snap-62d950ea", "volume_type": "gp2"}, "/dev/sdb": {"delete_on_termination": false, "encrypted": null, "size": null, "snapshot_id": null, "volume_type": null}, "/dev/sdc": {"delete_on_termination": false, "encrypted": null, "size": null, "snapshot_id": null, "volume_type": null}}, "creationDate": "2017-04-04T18:41:05.000Z", "description": null, "hypervisor": "xen", "is_public": false, "location": "526262051452/test-2017-04-04T18-41-04Z", "name": "test-2017-04-04T18-41-04Z", "owner_id": "526262051452", "platform": null, "root_device_name": "/dev/sda1", "root_device_type": "ebs", "state": "available", "tags": {}, "virtualization_type": "hvm"}, {"ami_id": "ami-f5c646e3", "architecture": "x86_64", "block_device_mapping": {"/dev/sda1": {"delete_on_termination": true, "encrypted": false, "size": 8, "snapshot_id": "snap-64c81cd7", "volume_type": "gp2"}, "/dev/sdb": {"delete_on_termination": false, "encrypted": null, "size": null, "snapshot_id": null, "volume_type": null}, "/dev/sdc": {"delete_on_termination": false, "encrypted": null, "size": null, "snapshot_id": null, "volume_type": null}}, "creationDate": "2017-04-04T19:51:07.000Z", "description": null, "hypervisor": "xen", "is_public": false, "location": "526262051452/test-2017-04-04T19-51-06Z", "name": "test-2017-04-04T19-51-06Z", "owner_id": "526262051452", "platform": null, "root_device_name": "/dev/sda1", "root_device_type": "ebs", "state": "available", "tags": {}, "virtualization_type": "hvm"}]}

TASK [delete-old-amis : ec2_ami] ***********************************************
changed: [localhost] => (item={u'ami_id': u'ami-ae33b2b8', u'root_device_type': u'ebs', u'description': None, u'tags': {}, u'hypervisor': u'xen', u'block_device_mapping': {u'/dev/sdb': {u'encrypted': None, u'snapshot_id': None, u'delete_on_termination': False, u'volume_type': None, u'size': None}, u'/dev/sda1': {u'encrypted': False, u'snapshot_id': u'snap-6d9288d9', u'delete_on_termination': True, u'volume_type': u'gp2', u'size': 8}, u'/dev/sdc': {u'encrypted': None, u'snapshot_id': None, u'delete_on_termination': False, u'volume_type': None, u'size': None}}, u'architecture': u'x86_64', u'owner_id': u'526262051452', u'platform': None, u'state': u'available', u'location': u'526262051452/test-2017-04-04T18-08-34Z', u'is_public': False, u'creationDate': u'2017-04-04T18:08:36.000Z', u'root_device_name': u'/dev/sda1', u'virtualization_type': u'hvm', u'name': u'test-2017-04-04T18-08-34Z'}) => {"changed": true, "item": {"ami_id": "ami-ae33b2b8", "architecture": "x86_64", "block_device_mapping": {"/dev/sda1": {"delete_on_termination": true, "encrypted": false, "size": 8, "snapshot_id": "snap-6d9288d9", "volume_type": "gp2"}, "/dev/sdb": {"delete_on_termination": false, "encrypted": null, "size": null, "snapshot_id": null, "volume_type": null}, "/dev/sdc": {"delete_on_termination": false, "encrypted": null, "size": null, "snapshot_id": null, "volume_type": null}}, "creationDate": "2017-04-04T18:08:36.000Z", "description": null, "hypervisor": "xen", "is_public": false, "location": "526262051452/test-2017-04-04T18-08-34Z", "name": "test-2017-04-04T18-08-34Z", "owner_id": "526262051452", "platform": null, "root_device_name": "/dev/sda1", "root_device_type": "ebs", "state": "available", "tags": {}, "virtualization_type": "hvm"}, "msg": "AMI deregister/delete operation complete"}
changed: [localhost] => (item={u'ami_id': u'ami-ac37b6ba', u'root_device_type': u'ebs', u'description': None, u'tags': {}, u'hypervisor': u'xen', u'block_device_mapping': {u'/dev/sdb': {u'encrypted': None, u'snapshot_id': None, u'delete_on_termination': False, u'volume_type': None, u'size': None}, u'/dev/sda1': {u'encrypted': False, u'snapshot_id': u'snap-62d950ea', u'delete_on_termination': True, u'volume_type': u'gp2', u'size': 8}, u'/dev/sdc': {u'encrypted': None, u'snapshot_id': None, u'delete_on_termination': False, u'volume_type': None, u'size': None}}, u'architecture': u'x86_64', u'owner_id': u'526262051452', u'platform': None, u'state': u'available', u'location': u'526262051452/test-2017-04-04T18-41-04Z', u'is_public': False, u'creationDate': u'2017-04-04T18:41:05.000Z', u'root_device_name': u'/dev/sda1', u'virtualization_type': u'hvm', u'name': u'test-2017-04-04T18-41-04Z'}) => {"changed": true, "item": {"ami_id": "ami-ac37b6ba", "architecture": "x86_64", "block_device_mapping": {"/dev/sda1": {"delete_on_termination": true, "encrypted": false, "size": 8, "snapshot_id": "snap-62d950ea", "volume_type": "gp2"}, "/dev/sdb": {"delete_on_termination": false, "encrypted": null, "size": null, "snapshot_id": null, "volume_type": null}, "/dev/sdc": {"delete_on_termination": false, "encrypted": null, "size": null, "snapshot_id": null, "volume_type": null}}, "creationDate": "2017-04-04T18:41:05.000Z", "description": null, "hypervisor": "xen", "is_public": false, "location": "526262051452/test-2017-04-04T18-41-04Z", "name": "test-2017-04-04T18-41-04Z", "owner_id": "526262051452", "platform": null, "root_device_name": "/dev/sda1", "root_device_type": "ebs", "state": "available", "tags": {}, "virtualization_type": "hvm"}, "msg": "AMI deregister/delete operation complete"}
changed: [localhost] => (item={u'ami_id': u'ami-f5c646e3', u'root_device_type': u'ebs', u'description': None, u'tags': {}, u'hypervisor': u'xen', u'block_device_mapping': {u'/dev/sdb': {u'encrypted': None, u'snapshot_id': None, u'delete_on_termination': False, u'volume_type': None, u'size': None}, u'/dev/sda1': {u'encrypted': False, u'snapshot_id': u'snap-64c81cd7', u'delete_on_termination': True, u'volume_type': u'gp2', u'size': 8}, u'/dev/sdc': {u'encrypted': None, u'snapshot_id': None, u'delete_on_termination': False, u'volume_type': None, u'size': None}}, u'architecture': u'x86_64', u'owner_id': u'526262051452', u'platform': None, u'state': u'available', u'location': u'526262051452/test-2017-04-04T19-51-06Z', u'is_public': False, u'creationDate': u'2017-04-04T19:51:07.000Z', u'root_device_name': u'/dev/sda1', u'virtualization_type': u'hvm', u'name': u'test-2017-04-04T19-51-06Z'}) => {"changed": true, "item": {"ami_id": "ami-f5c646e3", "architecture": "x86_64", "block_device_mapping": {"/dev/sda1": {"delete_on_termination": true, "encrypted": false, "size": 8, "snapshot_id": "snap-64c81cd7", "volume_type": "gp2"}, "/dev/sdb": {"delete_on_termination": false, "encrypted": null, "size": null, "snapshot_id": null, "volume_type": null}, "/dev/sdc": {"delete_on_termination": false, "encrypted": null, "size": null, "snapshot_id": null, "volume_type": null}}, "creationDate": "2017-04-04T19:51:07.000Z", "description": null, "hypervisor": "xen", "is_public": false, "location": "526262051452/test-2017-04-04T19-51-06Z", "name": "test-2017-04-04T19-51-06Z", "owner_id": "526262051452", "platform": null, "root_device_name": "/dev/sda1", "root_device_type": "ebs", "state": "available", "tags": {}, "virtualization_type": "hvm"}, "msg": "AMI deregister/delete operation complete"}

PLAY ***************************************************************************

TASK [terminate : Terminate old instance(s)] ***********************************
changed: [ec2-34-205-9-162.compute-1.amazonaws.com] => {"changed": true, "instance_ids": ["i-0f55d61570fb6af45"], "instances": [{"ami_launch_index": "0", "architecture": "x86_64", "block_device_mapping": {}, "dns_name": "", "ebs_optimized": false, "groups": {}, "hypervisor": "xen", "id": "i-0f55d61570fb6af45", "image_id": "ami-e5bf05f3", "instance_type": "t2.nano", "kernel": null, "key_name": "autoscaling", "launch_time": "2017-04-04T22:16:16.000Z", "placement": "us-east-1a", "private_dns_name": "", "private_ip": null, "public_dns_name": "", "public_ip": null, "ramdisk": null, "region": "us-east-1", "root_device_name": "/dev/sda1", "root_device_type": "ebs", "state": "terminated", "state_code": 48, "tags": {"Name": "testamibuild"}, "tenancy": "default", "virtualization_type": "hvm"}], "tagged_instances": []}

PLAY RECAP *********************************************************************
ec2-34-205-9-162.compute-1.amazonaws.com : ok=3    changed=2    unreachable=0    failed=0   
localhost                  : ok=16   changed=8    unreachable=0    failed=0   

k@laptop:~/bogo$ 

A newly created Auto Scaling group:

Launch configuration:

We can see we have a new instance (test) and a deleted amibuild (testamibuild) instance:

Immutable Infrastructure with AWS and Ansible - Part 3 - Autoscaling

Ansible 2.0