Install Docker Engine on CentOS 7

playbook.yml

become: yes
tasks:
    - name: Gather the rpm package facts
      package_facts:
        manager: auto

    - name: Check whether docker-ce is installed
      set_fact:
        docker_installed: true
      when: "'docker-ce' in ansible_facts.packages"

    - name: docker_installed
      debug:
        var: docker_installed

    - name: Add Docker repo
      get_url:
        url: https://download.docker.com/linux/centos/docker-ce.repo
        dest: /etc/yum.repos.d/docker-ce.repo
      when: "docker_installed"

    - name: Install Docker
      package:
        name: docker-ce
        state: latest
      when: "docker_installed"

    # - name: Add user birkhoff to docker group
    #   user:
    #     name: birkhoff
    #     groups: docker
    #     append: yes

    - name: Enable the Docker daemon in systemd
      systemd:
        name: docker
        enabled: yes
        masked: no

    - name: Start Docker service
      service:
        name: docker
        state: started
        enabled: yes
      become: yes