These are a bunch of docker commands that I find useful for keeping things tidy.
Remove all orphaned images. These are the images tagged as <none>.
docker images -q --filter "dangling=true" | xargs docker rmi
Delete/remove all stopped containers. Note that -v option; it will also delete any persistent volumes that belong to the stopped containers.
docker ps -aq --filter "status=exited" | xargs docker rm -v && docker ps -aq --filter "status=created"