Removing images in Docker - Cheat Sheet & Quick Revision

Recall & Review

beginner

What command is used to remove a Docker image by its image ID or name?

Use docker rmi <image_id_or_name> to remove a Docker image.

beginner

What happens if you try to remove a Docker image that is currently used by a running container?

Docker will not allow removing an image if it is used by a running container. You must stop or remove the container first.

intermediate

How can you force remove a Docker image even if it is used by stopped containers?

Use docker rmi -f <image_id_or_name> to force remove the image even if it is used by stopped containers.

intermediate

How do you remove all unused Docker images (dangling images) at once?

Use docker image prune to remove all dangling images that are not tagged or used by containers.

beginner

What is the difference between docker rmi and docker image rm?

Both commands do the same thing: remove Docker images. docker rmi is a shortcut for docker image rm.

Which command removes a Docker image by its name or ID?

A docker rmi <image>

B docker rm <image>

C docker stop <image>

D docker run <image>

docker rmi is used to remove images. docker rm removes containers, not images.

What must you do before removing an image used by a running container?

A Stop or remove the container first

B Restart the container

C Nothing, just remove the image

D Rename the image

You must stop or remove containers using the image before removing it.

How do you force remove a Docker image even if it is used by stopped containers?

A docker image prune

B docker rm -f <image>

C docker rmi -f <image>

D docker stop -f <image>

docker rmi -f forces removal of the image even if it is used by stopped containers.

Which command removes all dangling (unused) Docker images?

A docker rmi all

B docker image prune

C docker rm dangling

D docker image rm -a

docker image prune removes all dangling images that are not tagged or used.

What is the shortcut command to remove Docker images?

A docker remove

B docker rm

C docker image rm

D docker rmi

docker rmi is a shortcut for docker image rm.

Explain how to safely remove a Docker image that is currently used by containers.

Think about container dependencies before deleting images.

Describe the difference between removing images normally and forcing their removal in Docker.

Consider what happens when containers depend on the image.