how to add a user to docker group if docker group is there?

[Robert Chen]

default user add to users group, if docker group is there, also add to docker group.

How to write this snabile-playbook?

[Larry Smith]

This may be of some help for you. https://github.com/mrlesmithjr/ansible-docker/blob/master/tasks/users.yml

Basically this should work for you as a playbook.

---

- hosts: docker_hosts

  vars:

    docker_users:

      - 'vagrant'

  tasks:

    - name: users | adding docker users (for use without sudo)

      user:

        name: "{{ item }}"

        append: yes

        groups: docker

      become: true

      with_items: '{{ docker_users }}'