ansible playbook and roles

ansible/roles/docker/tasks/docker-users.yml

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+---
+- name: Ensure docker users are added to the docker group.
+  user:
+    name: "{{ item }}"
+    groups: docker
+    append: true
+  with_items: "{{ docker_users }}"

ansible/roles/docker/tasks/main.yml

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+---
+- include_tasks: setup-RedHat.yml
+  when: ansible_os_family == 'RedHat'
+
+- include_tasks: setup-Debian.yml
+  when: ansible_os_family == 'Debian'
+
+- name: Install Docker packages.
+  package:
+    name: "{{ docker_packages }}"
+    state: "{{ docker_packages_state }}"
+  notify: restart docker
+  ignore_errors: "{{ ansible_check_mode }}"
+  when: "ansible_version.full is version_compare('2.12', '<') or ansible_os_family not in ['RedHat', 'Debian']"
+
+- name: Install Docker packages (with downgrade option).
+  package:
+    name: "{{ docker_packages }}"
+    state: "{{ docker_packages_state }}"
+    allow_downgrade: true
+  notify: restart docker
+  ignore_errors: "{{ ansible_check_mode }}"
+  when: "ansible_version.full is version_compare('2.12', '>=') and ansible_os_family in ['RedHat', 'Debian']"
+
+- name: Ensure /etc/docker/ directory exists.
+  file:
+    path: /etc/docker
+    state: directory
+    mode: 0755
+  when: docker_daemon_options.keys() | length > 0
+
+- name: Configure Docker daemon options.
+  copy:
+    content: "{{ docker_daemon_options | to_nice_json }}"
+    dest: /etc/docker/daemon.json
+    mode: 0644
+  when: docker_daemon_options.keys() | length > 0
+  notify: restart docker
+
+- name: Ensure Docker is started and enabled at boot.
+  service:
+    name: docker
+    state: "{{ docker_service_state }}"
+    enabled: "{{ docker_service_enabled }}"
+  ignore_errors: "{{ ansible_check_mode }}"
+  when: docker_service_manage | bool
+
+- name: Ensure handlers are notified now to avoid firewall conflicts.
+  meta: flush_handlers
+
+# On récupère les utilisateurs membres du groupe docker si on a passé des users dans la variable docker_users
+- name: Get docker group info using getent.
+  getent:
+    database: group
+    key: docker
+    split: ':'
+  when: docker_users | length > 0
+
+# On vérifie si les users n'exsistent pas. Si c'est le cas on créé une nouvelle variable
+- name: Check if there are any users to add to the docker group.
+  set_fact:
+    at_least_one_user_to_modify: true
+  when:
+    - docker_users | length > 0
+    - item not in ansible_facts.getent_group["docker"][2] # Permet de récupérer une liste des utilisateurs renseignée dans le troisième champs.
+  with_items: "{{ docker_users }}"
+
+# Si la nouvelle variable a été définie on exécute la task
+- include_tasks: docker-users.yml
+  when: at_least_one_user_to_modify is defined

ansible/roles/docker/tasks/setup-Debian.yml

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+---
+- name: Ensure old versions of Docker are not installed.
+  ansible.builtin.package:
+    name:
+      - docker
+      - docker-engine
+      - docker.io
+    state: absent
+
+- name: Ensure dependencies are installed.
+  ansible.builtin.apt:
+    name:
+      - apt-transport-https
+      - ca-certificates
+    state: present
+
+- name: Ensure additional dependencies are installed (on Ubuntu < 20.04 and any other systems).
+  ansible.builtin.apt:
+    name: gnupg2
+    state: present
+  when: ansible_distribution != 'Ubuntu' or ansible_distribution_version is version('20.04', '<')
+
+- name: Ensure additional dependencies are installed (on Ubuntu >= 20.04).
+  ansible.builtin.apt:
+    name: gnupg
+    state: present
+  when: ansible_distribution == 'Ubuntu' and ansible_distribution_version is version('20.04', '>=')
+
+- name: Add Docker apt key.
+  ansible.builtin.get_url:
+    url: "{{ docker_apt_gpg_key }}"
+    dest: /etc/apt/trusted.gpg.d/docker.asc
+    mode: '0644'
+    force: true
+  register: add_repository_key
+  ignore_errors: "{{ docker_apt_ignore_key_error }}"
+
+- name: Ensure curl is present (on older systems without SNI).
+  ansible.builtin.package: 
+    name: curl
+    state: present
+  when: add_repository_key is failed
+
+- name: Add Docker apt key (alternative for older systems without SNI).
+  shell: >
+    curl -sSL {{ docker_apt_gpg_key }} | apt-key add -
+  args:
+    warn: false
+  when: add_repository_key is failed
+
+- name: Add Docker repository.
+  apt_repository:
+    repo: "{{ docker_apt_repository }}"
+    state: present
+    update_cache: true

ansible/roles/docker/tasks/setup-RedHat.yml

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+---
+- name: Ensure old versions of Docker are not installed.
+  package:
+    name:
+      - docker
+      - docker-common
+      - docker-engine
+    state: absent
+
+- name: Add Docker GPG key.
+  rpm_key:
+    key: "{{ docker_yum_gpg_key }}"
+    state: present
+
+- name: Add Docker repository.
+  get_url:
+    url: "{{ docker_yum_repo_url }}"
+    dest: '/etc/yum.repos.d/docker-{{ docker_edition }}.repo'
+    owner: root
+    group: root
+    mode: 0644
+
+- name: Configure containerd on RHEL 8.
+  block:
+    - name: Ensure container-selinux is installed.
+      package:
+        name: container-selinux
+        state: present
+
+    - name: Ensure containerd.io is installed.
+      package:
+        name: containerd.io
+        state: present
+  when: ansible_distribution_major_version | int == 8