$ cd centos
$ docker build -t DOCKER_IMAGE_NAME .

$ cat molecule.yml
docker:
  containers:
    - name: ansible-dockerswarm-01
      ansible_groups:
        - docker_engine
        - docker_swarm_manager
      image: sergk/docker-travis-ci
      image_version: ubuntu16.04-latest
      privileged: True
    - name: ansible-dockerswarm-02
      ansible_groups:
        - docker_engine
        - docker_swarm_manager
      image: sergk/docker-travis-ci
      image_version: centos7-latest
      privileged: True
      volume_mounts:
        - '/sys/fs/cgroup:/sys/fs/cgroup:ro'
      command: '/usr/sbin/init'
    - name: ansible-dockerswarm-03
      ansible_groups:
        - docker_engine
        - docker_swarm_worker
      image: sergk/docker-travis-ci
      image_version: centos7-latest
      privileged: True
      volume_mounts:
        - '/sys/fs/cgroup:/sys/fs/cgroup:ro'
      command: '/usr/sbin/init'