I have a running docker service in a Fedora 21 system for a while. Recently I got some disgusting erros preventing restart docker:
device-mapper: table: 253:7: thin: Couldn't open thin internal device
I am a docker newbie so I lost a lot of time thinking if my thin device got corrupt or whatever. Indeed I openened an issue (#16341) to the docker project to report it. But now I conclude is not an upstream error but a Fedora's packaging one.
The problem was caused in this regular update:
-0:docker-io-1.6.2-3.gitc3ca5bb.fc21.x86_64 +0:docker-io-1.8.1-2.git32b8b25.fc21.x86_64 -0:docker-storage-setup-0.0.3-1.fc21.noarchwhich did this:
-DOCKER_STORAGE_OPTIONS= +DOCKER_STORAGE_OPTIONS=--storage-driver devicemapper --storage-opt -dm.fs=xfs --storage-opt dm.thinpooldev=/dev/mapper/vg_patxuko-docker--pool
And after the next system reboot the docker service was unable to restart. Removing the DOCKER_STORAGE_OPTIONS value returned system to service.
More details at this comment.
Hope it helps.