- name: Install Docker Prereqs
  hosts: hosts
  gather_facts: yes
  tasks:
    - package:
        name: "{{item}}"
        state: latest
      with_items:
        - apt-transport-https
        - ca-certificates
        - curl
        - software-properties-common
    - apt_key:
        url: "https://download.docker.com/linux/ubuntu/gpg"
        state: present
    - apt_repository:
        repo: "deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable"
        state: present

- name: Install Docker
  hosts: hosts
  gather_facts: yes
  tasks:
    - package:
        name: "docker-ce"
        state: latest
    - user:
        name: "{{ ansible_ssh_user }}"
        groups: docker
        append: yes