create_docker_swarm.yml

- name: install config and startup dockerd on all guests
  hosts: all
  user: root
  gather_facts: False
  tasks:

    - name: show host information
      debug: msg="{{ inventory_hostname + ' ' + ansible_ssh_host }}"

    - name: add the upstream docker repository
      copy: src=files/docker-engine.repo dest=/etc/yum.repos.d/docker-engine.repo

    - name: install docker packages
      yum: 
        name: "{{ item }}"  
        state: latest
      with_items:
        - python-docker-py
        - docker-engine

    - name: set the dockerd startup args for swarm
      lineinfile:
        dest: /usr/lib/systemd/system/docker.service
        line: 'ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock'
        regexp: '^ExecStart'
        state: present
      register: dconfig

    - name: restart dockerd if config changed
      shell: systemctl restart docker.service
      when: dconfig.changed

    - name: ensure docker is running
      service: name=docker state=running 

    #- name: DEBUG KILL ALL RUNNING CONTAINERS
    #  shell: docker ps -a | awk '{print $1}' | egrep -v CONTAINER | xargs docker kill
    #  ignore_errors: True

    #- name: DEBUG REMOVE ALL RUNNING CONTAINERS
    #  shell: docker ps -a | awk '{print $1}' | egrep -v CONTAINER | xargs docker rm
    #  ignore_errors: True


- name: setup the consul container
  hosts: consul0
  user: root
  gather_facts: False
  tasks:

    - name: check for the consul container
      shell: docker inspect consul
      changed_when: False
      ignore_errors: True
      register: consul_check

    - name: start the consul container if not exists
      shell: docker run -d -p 8500:8500 --name=consul progrium/consul -server -bootstrap
      when: "consul_check.rc != 0"

- name: setup the managers
  hosts: manager*
  user: root
  gather_facts: False
  tasks:

    - name: set a fact for the consul IP
      set_fact:
        consul_ip: "{{ hostvars['consul0']['ansible_ssh_host'] }}"

    - name: check for the manager container
      shell: docker inspect swarm_manager
      changed_when: False
      ignore_errors: True
      register: manager_check

    - name: start the swarm manager
      shell: "{{ 'docker run --name=swarm_manager -d -p 4000:4000 swarm manage -H :4000 --replication --advertise ' + ansible_ssh_host + ':4000 consul://' + consul_ip + ':8500' }}"
      when: "manager_check.rc != 0"

- name: setup the swarm nodes
  hosts: node*
  user: root
  gather_facts: False
  tasks:

    - name: set a fact for the consul IP
      set_fact:
        consul_ip: "{{ hostvars['consul0']['ansible_ssh_host'] }}"

    - name: check for the swarm container
      shell: docker inspect swarm_node
      changed_when: False
      ignore_errors: True
      register: swarm_check

    # docker run -d swarm join --advertise=<node_ip>:2375 consul://<consul0_ip>:8500
    - name: start the swarm node
      shell: "{{ 'docker run --name=swarm_node -d swarm join --advertise=' + ansible_ssh_host + ':2375 consul://' + consul_ip + ':8500' }}"
      when: "swarm_check.rc != 0"

- name: check the swarm's info
  hosts: manager0
  user: root
  gather_facts: False
  tasks:
    - shell: docker -H :4000 info