Container disk usage management in Docker - Cheat Sheet & Quick Revision

Recall & Review

beginner

What command shows the disk space used by Docker images, containers, volumes, and build cache?

The command docker system df displays disk usage by Docker images, containers, volumes, and build cache.

beginner

How can you remove all stopped containers to free up disk space?

Use docker container prune to remove all stopped containers and free disk space.

intermediate

What does the command docker image prune -a do?

It removes all unused images, including dangling and unreferenced images, freeing disk space.

beginner

Why should you manage Docker volumes regularly?

Unused volumes can take up disk space. Running docker volume prune removes unused volumes to save space.

intermediate

What is the effect of docker system prune?

It removes stopped containers, unused networks, dangling images, and build cache to free disk space.

Which command shows detailed disk usage of Docker resources?

A docker system df

B docker ps

C docker images

D docker info

docker system df shows disk usage details for images, containers, volumes, and cache.

How do you remove all stopped containers at once?

A docker rm -f

B docker container prune

C docker image prune

D docker volume prune

docker container prune removes all stopped containers safely.

What does docker image prune -a remove?

A Only dangling images

B All volumes

C All containers

D All unused images

The -a flag removes all unused images, not just dangling ones.

Which command removes unused Docker volumes?

A docker system prune

B docker volume rm

C docker volume prune

D docker container prune

docker volume prune removes all unused volumes to free disk space.

What does docker system prune NOT remove by default?

A Running containers

B Unused networks

C Dangling images

D Stopped containers

Running containers are not removed by docker system prune.

Explain how to check and clean up disk space used by Docker containers, images, and volumes.

Think about commands that show usage and commands that remove unused resources.

Describe the difference between removing dangling images and all unused images in Docker.

Focus on the meaning of dangling vs unused images and the prune command flags.