Create Docker containers, add them to the Ansible inventory and test if task is running inside a container. Usefull for skip tasks that cannot be done inside a container (service management)

ansible-in-docker-test.yml

- hosts: localhost
  become: no
  vars:
    distros:
      - "yanc0/debian-python"
      - "centos"
  tasks:
    - name: print ansible_connection
      debug:
        msg: "{{ansible_connection}}"

    - name: run test containers
      docker_container:
        name: "test_{{item | regex_replace('/','-') }}"
        image: "{{item}}:latest"
        command: "sleep infinity"
      with_items: "{{distros}}"

    - name: add containers in the ansible inventory
      add_host:
        hostname: "test_{{item | regex_replace('/','-') }}"
        ansible_connection: "docker"
        groups: "test"
      with_items: "{{distros}}"
      changed_when: false

- hosts: test
  become: no
  tasks:
    - name: print ansible_connection
      debug:
        msg: "{{ansible_connection}}"

    - name: ansible in a container?
      debug:
        msg: "YES !"
      when: "ansible_connection == 'docker'"