About runc, coreos had a similar issue and the problem was fixed by specifying the commit when building https://github.com/coreos/coreos-overlay/pull/2428/commits/a0294fbf2caf5f1a04651a22bb67357969f5831f There is a similar issue in RedHat bugzilla. The warning is harmless but the thing is that docker checks whether you are using their docker runc binary built with a very specific commit. If this is not causing you an issue, we can fix that in the next docker update.