Sharing volumes between containers in Docker - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Docker volume?

A Docker volume is a storage area managed by Docker that containers can use to save and share data persistently outside the container's writable layer.

beginner

How do you share data between two Docker containers using volumes?

You create a Docker volume and mount it into both containers at the desired path. This way, both containers can read and write to the same data location.

beginner

What is the command to create a Docker volume named 'shared-data'?

docker volume create shared-data

intermediate

How do you run two containers sharing the same volume 'shared-data' at path '/app/data'?

docker run -d --name container1 -v shared-data:/app/data image1 docker run -d --name container2 -v shared-data:/app/data image2

beginner

Why is sharing volumes between containers useful?

It allows containers to share files and data easily, such as logs, configuration files, or databases, without copying data between containers or rebuilding images.

Which Docker command creates a volume named 'data-vol'?

A docker volume create data-vol

B docker create volume data-vol

C docker volume new data-vol

D docker volume add data-vol

The correct command to create a volume is 'docker volume create '.

How do you mount a volume named 'shared-vol' to '/data' inside a container?

A docker run -v /data:shared-vol image

B docker run --mount shared-vol:/data image

C docker run --volume /data:shared-vol image

D docker run -v shared-vol:/data image

The syntax to mount a volume is '-v volume-name:container-path'.

What happens if two containers share the same Docker volume?

A They cannot access the volume simultaneously.

B They share the same data stored in the volume.

C Each container gets a copy of the volume data.

D The volume is deleted after the first container stops.

Sharing a volume means both containers access the same data location.

Which of these is NOT a benefit of sharing volumes between containers?

A Persistent data storage

B Data sharing between containers

C Automatic container networking

D Avoiding data duplication

Sharing volumes does not handle networking between containers.

To share a volume between containers, you must:

A Create a volume and mount it in both containers

B Copy files manually between containers

C Use the same image for both containers

D Run containers on the same host only

Sharing volumes requires creating a volume and mounting it into each container.

Explain how to share data between two Docker containers using volumes.

Think about creating a common storage space both containers can use.

Describe the benefits of using Docker volumes to share data between containers.

Consider why sharing data directly is better than copying files.