Creating and managing volumes in Docker - Quick Revision & Summary

Recall & Review

beginner

What is a Docker volume?

A Docker volume is a storage area outside the container's writable layer. It lets containers save and share data persistently, even if the container stops or is deleted.

beginner

How do you create a Docker volume named mydata?

Use the command: <br>docker volume create mydata<br>This creates a new volume called mydata that containers can use to store data.

beginner

How do you attach a volume to a container?

Use the -v or --mount option when running a container. For example:<br>docker run -v mydata:/app/data myimage<br>This mounts the volume mydata inside the container at /app/data.

beginner

How can you list all Docker volumes on your system?

Run the command:<br>docker volume ls<br>This shows all volumes available on your Docker host.

intermediate

How do you remove a Docker volume named mydata?

Use the command:<br>docker volume rm mydata<br>This deletes the volume named mydata. Make sure no container is using it first.

What happens to data in a Docker volume if the container using it is deleted?

A The data remains safe in the volume.

B The data is deleted with the container.

C The data is copied to the host's home directory.

D The data is moved to a new container automatically.

Docker volumes store data outside the container's writable layer, so deleting a container does not delete the volume or its data.

Which command creates a new Docker volume named backup?

A docker volume create backup

B docker create volume backup

C docker volume new backup

D docker volume add backup

The correct syntax to create a volume is docker volume create [name].

How do you mount a volume named data to the path /var/lib/data inside a container?

A docker run --volume /var/lib/data:data image

B docker run -v /var/lib/data:data image

C docker run -v data:/var/lib/data image

D docker run --mount data:/var/lib/data image

The -v option uses the syntax volume_name:container_path.

Which command lists all Docker volumes?

A docker volume list

B docker volume ls

C docker volumes

D docker list volumes

The correct command to list volumes is docker volume ls.

What must you do before removing a Docker volume?

A Restart the Docker service.

B Stop all running containers.

C Backup the volume to a file.

D Ensure no container is using the volume.

You cannot remove a volume if it is currently used by any container.

Explain how to create a Docker volume and use it in a container.

Think about commands to create and run containers with volumes.

Describe how to list and remove Docker volumes safely.

Consider commands and safety steps before deleting volumes.