Clean docker, free some disk space

clean-docker-free-disk-space.sh

# Make sure that exited containers are deleted
docker rm -v $(docker ps -a -q -f status=exited) 
# Remove unwanted ‘dangling’ images. 
docker rmi $(docker images -f "dangling=true" -q)
# Unwanted volumes
docker run -v /var/run/docker.sock:/var/run/docker.sock -v /var/lib/docker:/var/lib/docker --rm martin/docker-cleanup-volumes

# or just
docker rm -v $(docker ps -a -q -f status=exited) && \
docker rmi $(docker images -f "dangling=true" -q) && \
docker run -v /var/run/docker.sock:/var/run/docker.sock -v /var/lib/docker:/var/lib/docker --rm martin/docker-cleanup-volumes