Consistently out of disk space in docker beta

I wonder if you’re all really running out of disk space or if you’re running out of inodes. See Running out of inodes. To check, run:
docker run --rm --privileged debian:jessie df -h
and
docker run --rm --privileged debian:jessie df -h -i

You can free up space by purging containers and unused images:

docker ps -q -a -f status=exited | xargs -n 100 docker rm -v docker images -q --filter "dangling=true" | xargs -n 100 docker rmi

And this frees up inodes, though it can take several minutes to run:

docker run -v /var/run/docker.sock:/var/run/docker.sock -v /var/lib/docker:/var/lib/docker --rm martin/docker-cleanup-volumes