test.yaml

---
- hosts: localhost

  tasks:
    # Create a Docker network that the containers will connect to. This will enable the
    # containers to be able to see and access each other.
    # This requires Ansible 2.2 for this docker_network module.
    - name: Create Docker network
      docker_network:
        name: zookeeper
        ipam_options:
          subnet: '172.25.0.0/16'

    # The centos/systemd image used to create these containers is required so
    # that systemd is available. This is used for the systemctl commands to
    # install and run the zookeeper services for this role. The privileged container
    # and "/sys/fs/cgroup" volume mount is also requird for systemd support.
    # Port 2181 is exposed as the ZooKeeper port.
    # The container needs to be started with the "/usr/lib/systemd/systemd" so that
    # this service is initialized.
    - name: Create Docker containers
      docker_container:
        name: '{{ item.1 }}'
        hostname: '{{ item.1 }}'
        image: centos/systemd
        state: started
        privileged: yes
        volumes:
          - /sys/fs/cgroup:/sys/fs/cgroup:ro
        networks:
          - name: zookeeper
            ipv4_address: 172.25.10.{{ item.0 + 1 }}
        purge_networks: yes
        exposed_ports:
          - 2181
          - 2888
          - 3888
        etc_hosts:
          zookeeper-1: 172.25.10.1
          zookeeper-2: 172.25.10.2
          zookeeper-3: 172.25.10.3
        command: /usr/lib/systemd/systemd
      with_indexed_items: "{{ groups['zookeeper-nodes'] }}"

# Install Java and ZooKeeper on all nodes.
- hosts: zookeeper-nodes

  pre_tasks:
    - name: Install Java 8 (OpenJDK)
      yum:
        name: java-1.8.0-openjdk
        state: installed

  roles:
    - ansible-zookeeper