netz39-infra-ansible/roles/docker_setup/tasks/main.yml

# This file is a mash-up of:
#   https://github.com/geerlingguy/ansible-role-docker/blob/master/tasks/docker-compose.yml
#   https://www.digitalocean.com/community/tutorials/how-to-install-docker-compose-on-debian-9
#   and our own stuff …
---
- name: Gather package facts
  package_facts:
    manager: "auto"

- name: Exit if docker.io is installed
  fail:
    msg: "Please remove docker.io (Debian vanilla docker package) first!"
  when: "'docker.io' in ansible_facts.packages"

- name: Install Docker APT deps
  package:
    name: "{{ packages }}"
    state: present
  vars:
    packages:
      - apt-transport-https
      - ca-certificates
      - gnupg2
      - software-properties-common

- name: add Docker apt-key
  apt_key:
    url: https://download.docker.com/linux/debian/gpg
    state: present

- name: add Docker's APT repository
  apt_repository:
    repo: deb https://download.docker.com/linux/debian buster stable
    state: present
    update_cache: true
    filename: "docker"

- name: install Docker
  package:
    name: "{{ packages }}"
    state: present
  vars:
    packages:
      - docker-ce
      - python3-docker

- name: Set docker configuration
  template:
    src: templates/daemon.json.j2
    dest: /etc/docker/daemon.json
  notify: restart docker

- name: Check current docker-compose version.
  command: docker-compose --version
  register: docker_compose_current_version
  changed_when: false
  failed_when: false

- name: Delete existing docker-compose version if it's different.
  file:
    path: "{{ docker_compose_path }}"
    state: absent
  when: >
    docker_compose_current_version.stdout is defined
    and docker_compose_version not in docker_compose_current_version.stdout

- name: Install Docker Compose (if configured).
  get_url:
    url: https://github.com/docker/compose/releases/download/{{ docker_compose_version }}/docker-compose-Linux-x86_64
    dest: "{{ docker_compose_path }}"
    mode: 0755

- name: Place admin users in docker group
  user:
    name: "{{ item.logname }}"
    groups: [docker]
    append: yes
  when: item.docker
  with_items: "{{ users }}"