geerlingguy.ansible-role-docker/tasks/docker-rootless.yml

---
- name: Ensure dockerd-rootless-setup.sh is installed
  apt:
    name:
      - uidmap
      - docker-ce-rootless-extras
    state: present

- name: Stop any running root instances of docker daemon
  systemd:
    name: docker.service
    state: stopped
    enabled: false

- name: Close root docker socket
  systemd:
    name: docker.socket
    state: stopped
    enabled: false

- name: Remove docker.sock file
  file:
    path: /var/run/docker.sock
    state: absent

- name: Install rootless docker
  become: false
  command: /usr/bin/dockerd-rootless-setuptool.sh install

- name: Enable and start rootless docker
  become: false
  systemd:
    name: docker
    state: started
    enabled: yes
    scope: user

- name: Decouple rootless docker from user session
  command: loginctl enable-linger {{ ansible_user }}

- name: Add DOCKER_HOST to systemwide environment file
  lineinfile:
    path: /etc/environment
    insertafter: EOF
    line: 'DOCKER_HOST=unix://$XDG_RUNTIME_DIR/docker.sock'