volumes

Volumes are the preferred mechanism for persisting data generated by and used by Docker containers. Volumes have several advantages over bind mounts:

• Volumes are easier to back up or migrate than bind mounts.
• You can manage volumes using Docker CLI commands or the Docker API.
• Volumes work on both Linux and Windows containers.
• Volumes can be more safely shared among multiple containers.
• Volume drivers let you store volumes on remote hosts or cloud providers, to encrypt the contents of volumes, or to add other functionality.
• New volumes can have their content pre-populated by a container.
• Volumes on Docker Desktop have much higher performance than bind mounts from Mac and Windows hosts.

To specific volumes, use -v or --mount flag on docker run command.

docker run -d -v myvol2:/app nginx:latest
# or
docker run -d --mount source=myvol2,target=/app nginx:latest

When you run one of the above commands, a myvol2 directory will be created under the /var/lib/docker/volumes directory.

And you can just create or delete volumes without using the docker run command:

docker volume cerate my-vol
docker volume ls
docker volume rm my-vol