https://bugzilla.redhat.com/show_bug.cgi?id=1140405
--- Comment #7 from Toshio Ernie Kuratomi a.badger@gmail.com --- Still happening. docker-io-1.4.1-5.fc21.x86_64
I'm guessing there's no way to solve this unless you can do one of the following:
* speed up the mkfs that docker is using in its initial run * push that initialization into something besides service startup * Tell systemd that starting docker should have a longer than normal timeout