Named volumes for data sharing in Docker - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a named volume in Docker?

A named volume is a storage area managed by Docker that can be shared between containers and persists data even if containers are removed.

beginner

How do you create and use a named volume in a Docker container?

Use the docker volume create myvolume command to create it, then run a container with docker run -v myvolume:/path/in/container to mount it.

intermediate

Why use named volumes instead of bind mounts for data sharing?

Named volumes are managed by Docker, provide better portability, and avoid permission issues that can happen with bind mounts on host directories.

beginner

Can multiple containers share the same named volume simultaneously?

Yes, multiple containers can mount the same named volume at the same time to share data between them.

beginner

What happens to a named volume when the container using it is deleted?

The named volume remains on the host system until explicitly removed, so data is preserved beyond the container's life.

Which command creates a named volume in Docker?

A docker volume new myvolume

B docker create volume myvolume

C docker volume create myvolume

D docker volume init myvolume

The correct command to create a named volume is docker volume create myvolume.

How do you mount a named volume inside a container at /data?

A docker run -volumes myvolume:/data myimage

B docker run -v myvolume:/data myimage

C docker run --volume myvolume /data myimage

D docker run -mount myvolume:/data myimage

Use -v myvolume:/data to mount the named volume inside the container.

What is a key benefit of using named volumes over bind mounts?

A They are managed by Docker and avoid host permission issues

B They are faster than bind mounts

C They automatically sync with cloud storage

D They delete data when containers stop

Named volumes are managed by Docker and avoid common permission problems with host directories.

If you delete a container, what happens to its named volume?

A The volume remains until manually removed

B The volume is deleted automatically

C The volume is backed up to Docker Hub

D The volume is converted to a bind mount

Named volumes persist after container deletion until you remove them explicitly.

Can two containers share the same named volume at the same time?

A Only if containers run on different hosts

B No, volumes are exclusive to one container

C Only if volumes are read-only

D Yes, they can share data through the volume

Multiple containers can mount the same named volume simultaneously to share data.

Explain what a named volume is and why it is useful for sharing data between Docker containers.

Think about how data stays safe even if containers are removed.

Describe the steps to create a named volume and use it in a Docker container.

Start with creating the volume, then attach it when running a container.