Docker volumes

Volumes are for

• hooking up container file system to host file system,
• persistence — storing data in host file system means data survives when you stop the container.

Anonymous volume

$ docker run -d --rm -v /home/paul/pgdata:/var/lib/postgresql/data postgres

Named volume

$ docker volume create pgdata
$ docker run -d --rm -v pgdata:/var/lib/postgresql/data postgres

Managing volumes

List all

$ docker volume ls

Cleanup unused volumes

$ docker volume prune

Find if an image expects a volume

$ docker image inspect postgres | grep Volumes -A 5

Find a volume used by a container

$ docker container inspect <name-or-id>

Inspect a named volume

$ docker volume inspect <volume-name>