#
# example1-volume.yaml
#

- hosts: localhost
  tasks:
    - name: check if myvolume exists
      command: docker volume inspect myvolume
      register: myvolume_exists
      failed_when: false

    - name: create myvolume
      command: docker volume create --name myvolume
      when: myvolume_exists|failed

 #
 # example2-A-Create-volume.yaml
 #
 - name: Run mariadb
    docker_container:
      name: mariadb-container
      image: mariadb
      env:
        MYSQL_ROOT_PASSWORD: "secret-password"
        MYSQL_DATABASE: "db"
        MYSQL_USER: "user"
        MYSQL_PASSWORD: "password"
      ports:
        - "3306:3306"
      volumes:
        #mariadb-data is a named volume which was automatically created by docker:
        - mariadb-data:/var/lib/mysql

#
# example2-B-Inspect-volume.sh
sudo docker volume inspect mariadb-data
# You will see below
[
    {
        "Name": "mariadb-data",
        "Driver": "local",
        "Mountpoint": "/var/lib/docker/volumes/mariadb-data/_data",
        "Labels": null,
        "Scope": "local"
    }
]