roles/docker-install/tasks/main.yml

---
# docker-install/tasks/main.yml
# note - all tasks run with become to preserve the `ansible_user_id` var

- name: Prereqs and SSL support for apt for SSL
  become: yes
  apt:
    name: "{{ item }}"
    update_cache: yes
    cache_valid_time: 3600
  with_items:
    - apt-transport-https
    - ca-certificates
    - python-pip

- name: Trust docker apt key
  become: yes
  apt_key:
    data: "{{ lookup('file', 'docker_apt_key.gpg') }}"

- name: Add docker apt repo
  become: yes
  apt_repository:
    repo: "{{ docker_apt_repo }}"

- name: Install docker
  become: yes
  apt:
    name: "docker-ce=17.06.*"
    update_cache: yes
    cache_valid_time: 3600

- name: Remove obsolete docker-py pip module
  become: yes
  pip:
    name: docker-py
    state: absent

- name: Install pip modules for docker and docker-compose
  become: yes
  pip:
    name: "{{ item }}"
  with_items:
    - docker>=2.4.2
    - docker-compose>=1.14.0

- name: Make current user part of the Docker group
  become: yes
  user:
    name: "{{ ansible_user_id }}"
    groups: "docker"
    append: yes