- name: Install Ansible Prereqs
  hosts: master:workers
  gather_facts: no
  tasks:
    - raw: "apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y python-minimal python-pip"

- name: Install Docker Prereqs
  hosts: master:workers
  gather_facts: yes
  tasks:
    - package:
        name: "{{item}}"
        state: latest
      with_items:
        - apt-transport-https
        - ca-certificates
        - curl
        - software-properties-common
    - apt_key:
        url: "https://download.docker.com/linux/ubuntu/gpg"
        state: present
    - apt_repository:
        repo: "deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable"
        state: present

- name: Install Docker
  hosts: master:workers
  gather_facts: yes
  tasks:
    - package:
        name: "docker-ce"
        state: latest
    - user:
        name: "{{ ansible_ssh_user }}"
        groups: docker
        append: yes

- name: Master - Initialize
  hosts: master
  gather_facts: yes
  tasks:
    - command: "docker swarm init --advertise-addr {{inventory_hostname}}"
    - command: "docker swarm join-token -q worker"
      register: cluster_token
    - set_fact: clustertoken="{{cluster_token.stdout}}"

- name: Workers - Join Cluster
  hosts: workers
  gather_facts: yes
  tasks:
  - command: "docker swarm join --advertise-addr {{inventory_hostname}} --token {{hostvars[groups['master'][0]].clustertoken}} {{hostvars[groups['master'][0]].inventory_hostname}}:2377"