ansible/docker.yml

- hosts: all
  become: yes
  roles:
    - docker
- hosts: swarmmanager
  become: yes
  tasks:
    - name: get swarm status
      shell: >
        docker info | egrep '^Swarm: ' | cut -d ' ' -f 2
      register: swarm_status
      changed_when: "'active' not in swarm_status.stdout_lines"
    - name: initialize swarm
      shell: >
        docker swarm init --advertise-addr={{ ansible_default_ipv4.address }}:2377
      when: "'active' not in swarm_status.stdout_lines"
    - name: get swarm token
      shell: docker swarm join-token -q worker
      register: swarm_token
      changed_when: "'active' not in swarm_status.stdout_lines"
- hosts: workers
  become: yes
  vars:
    swarm_token: "{{ hostvars[groups['swarmmanager'][0]]['swarm_token']['stdout'] }}"
    manager_ip: "{{ hostvars[groups['swarmmanager'][0]]['ansible_default_ipv4']['address'] }}"
  tasks:
    - name: get swarm status
      shell: >
        docker info | egrep '^Swarm: ' | cut -d ' ' -f 2
      register: swarm_status
      changed_when: "'active' not in swarm_status.stdout_lines"
    - name: join worker to swarm
      shell: >
        docker swarm join --token={{ swarm_token }} {{ manager_ip }}:2377
      when: "'active' not in swarm_status.stdout_lines"