---

    - hosts: test

      sudo: yes

      vars:

          apt_packages_ca:

              - apt-transport-https

              - ca-certificates

      tasks:   

       - name: add docker source list file for install docker

         file:

             path: /etc/apt/sources.list.d/docker.list

             state: touch

             owner: root

             mode: 'u+r,g+rw'                                                                         

       - name: write deb url of docker to docker.list

         blockinfile:

             dest: /etc/apt/sources.list.d/docker.list

             marker: ""

             block: |

                 deb https://apt.dockerproject.org/repo ubuntu-trusty main

       - name: add CA certificates and ensure installed

         apt:

             name: "{{ item }}"

             update_cache: yes

         with_items: "{{ apt_packages_ca }}"

       - name: add apt-key of dockers

         apt_key:

             keyserver: p80.pool.sks-keyservers.net

             id: 58118E89F3A912897C070ADBF76221572C52609D

       - name: install docker-engine

         apt:

             name: docker-engine

             state: latest

             force: yes
41   ...