How to remove old Docker images

Question

I’ve been running docker for a long time and there are a lot of unused images in my system. How can I remove all unused docker images safely?

Answer 1

Run the following command:

docker $ (docker images --filter "dangling=true" -q --no-trunc)

The dangling=true filter finds any unused images

Hence, any intermediate image that is no longer referenced by a labelled image is removed.