Docker cheat sheet

docker run = new container (specify image name)

docker exec = run a command in an existing container

How to turn a docker run command into an interactive shell:

-it --entrypoint=/bin/sh

Note, you have to add that before the name of the image.

Cleanup images

To filter down the images and only clean those matching some-text, use:

docker images | grep some-text | awk '{ print $1 ":" $2}' | xargs docker rmi

Cleanup orphaned images

Sometimes images are orphaned, for example, if you tagged an image as latest, and then built a new image with that same tag. They will show up as <none> in docker images. They can be cleaned up using:

docker rmi $(docker images -f "dangling=true" -q)

List images by size

docker images --format '{{.Size}}\t{{.Repository}}' | sort -hr

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