Docker cleanup

docker-cleanup.md

docker rm -v $(docker ps -a -q -f status=exited)
docker rmi $(docker images -f "dangling=true" -q)
docker volume rm $(docker volume ls -qf "dangling=true")

via http://blog.yohanliyanage.com/2015/05/docker-clean-up-after-yourself/ and https://github.com/chadoe/docker-cleanup-volumes