deploy-app.yml

- name: Create instances
  hosts: localhost
  connection: local
  gather_facts: no

  vars:
    service_account_email: ---
    credentials_file: file.json
    project_id: ---
    machine_type: n1-standard-1
    image: ubuntu-1604

  tasks:

   - name: Launch application instances
     gce:
         instance_names: app
         machine_type: "{{ machine_type }}"
         image: "{{ image }}"
         service_account_email: "{{ service_account_email }}"
         credentials_file: "{{ credentials_file }}"
         project_id: "{{ project_id }}"
         tags: app
         preemptible: true
     register: gce

   - name: Wait for SSH
     wait_for: host={{ item.public_ip }} port=22 delay=10 timeout=360
     loop: "{{ gce.instance_data }}"

   - name: Add host to group
     add_host: hostname={{ item.public_ip }} groupname=appservers
     loop: "{{ gce.instance_data }}"

- name: Provision app servers
  hosts: appservers
  connection: ssh
  sudo: True
  roles:
    - counter-app