jenkins-worker.yml

- hosts: localhost
  tasks:
  - name: Find the most recent ubuntu AMI
    ec2_ami_find:
      name: "ubuntu/images/hvm-ssd/ubuntu-artful-17.10-amd64*"
      owner: 099720109477
      region: "{{region}}"
      architecture: x86_64
      virtualization_type: hvm
      sort: creationDate
      sort_order: descending
      sort_end: 1
    register: ami_find

  - name: Is there a running ec2 instance?
    ec2_remote_facts:
      region: "{{region}}"
      filters:
        instance-state-name: running
        "tag:Name": "{{ami_tag}}"
    register: running_instances

  - name: Launch a test instance if we need one.
    ec2:
      region: "{{region}}"
      keypair: ansible
      instance_type: "{{instance_type}}"
      image: "{{ ami_find.results[0].ami_id }}"
      wait: yes
      count: 1
      instance_tags:
         Name: "{{ami_tag}}"
      vpc_subnet_id: "{{subnet}}"
      assign_public_ip: yes
      volumes:
        - device_name: /dev/sda1
          device_type: gp2
          volume_size: 8
          delete_on_termination: true
    when: running_instances.instances | length == 0
    register: created_instances

  - name: Build a list of instance id's.
    set_fact:
       instance_ids: "{{created_instances.instances | default([]) | map(attribute='id') | list }} + {{running_instances.instances | default([]) | map(attribute='id') | list}}"

  - name: Build a list of public IP's
    set_fact:
       ip_addresses: "{{created_instances.instances | default([]) | map(attribute='public_ip') | list }} + {{running_instances.instances | default([]) | map(attribute='public_ip_address') | list}}"

  - name: Wait 300 seconds for port 22 to open on our hosts
    wait_for:
      host: "{{item}}"
      port: 22
    with_items: "{{ip_addresses}}"

  - name: Accept new ssh fingerprints
    known_hosts:
      name: "{{item}}"
      key: "{{ lookup('pipe', 'ssh-keyscan -t ecdsa ' + item) }}"
      state: present
    with_items: "{{ip_addresses}}"

  - name: Add host to in-memory inventory
    add_host:
      name: "{{ item }}"
      groups: jenkins-worker-image
      ansible_user: ubuntu
    with_items: "{{ip_addresses}}"

- hosts: jenkins-worker-image
  gather_facts: no
  become: true
  roles:
  - jenkins-worker-image

- hosts: localhost
  tasks:
  - name: Build the AMI
    ec2_ami:
      region: "{{region}}"
      instance_id: "{{instance_ids[0]}}"
      wait: yes
      name: "{{ami_name}}"
      tags:
        Name: "{{ami_tag}}"
      device_mapping:
        - device_name: /dev/sda1
          volume_type: gp2
          size: 8
          delete_on_termination: true
        - device_name: /dev/sdb
          volume_type: gp2
          size: 8
          delete_on_termination: true
    register: new_ami

  - debug:
      var: new_ami

  - name: Clear old ssh fingerprints
    known_hosts:
      name: "{{item}}"
      state: absent
    with_items: "{{ip_addresses}}"

  - name: Terminate instances that were previously launched
    ec2:
      region: "{{region}}"
      state: 'absent'
      instance_ids: "{{instance_ids}}"