07_docker_install.yml

---
# Install Docker and Docker Compose on CentOS
# 

- name: Install Docker and Docker Compose on CentOS
  hosts: sample-vm
  remote_user: root
  become: true
  become_method: sudo

  tasks:
    #- name: Upgrade all packages
    #  yum: name=* state=latest

    - name: Check if Docker is installed
      command: systemctl status docker
      register: docker_check
      ignore_errors: yes

    - name: Download the Docker installer
      get_url:
        url: https://get.docker.com/
        dest: /tmp/get-docker.sh
        mode: 0700
      when: docker_check.stderr.find('service could not be found') != -1

    - name: Install Docker
      shell: /tmp/get-docker.sh
      when: docker_check.stderr.find('service could not be found') != -1

    - name: Remove the Docker installer file.
      file:
        state: absent
        path: /tmp/get-docker.sh

    - name: Create directory named /srv/docker
      file:
        path: /srv/docker
        state: directory
        mode: 0711
    
    - name: Create a symbolic link used by docker
      file:
        src: /srv/docker/
        dest: /var/lib/docker
        owner: root
        group: root
        state: link
        
    - name: Enable the Docker daemon in systemd
      systemd:
        name: docker
        enabled: yes
        masked: no

    - name: Start the Docker daemon
      systemd:
        name: docker
        state: started
        masked: no

    - name: Check if Docker Compose is installed
      command: docker-compose --version
      register: docker_compose_check
      ignore_errors: yes

    - name: Install the latest version of epel-release
      yum:
        name: ['epel-release']
        state: latest

    - name: Install the latest version of pip and pyOpenSSL
      yum:
        name: ['pyOpenSSL', 'python2-pip']
        state: latest

    - name: Install urllib3 ndg-httpsclient pyasn1 using Ansible pip module
      pip:
        name: urllib3,ndg-httpsclient,pyasn1

    - name: Download and install Docker Compose
      get_url:
        url: https://github.com/docker/compose/releases/download/1.24.1/docker-compose-Linux-x86_64
        dest: /usr/local/bin/docker-compose
        mode: 0755
      when:
        - docker_compose_check.msg is defined
        - docker_compose_check.msg.find('No such file or directory') != -1