coreos/coreos-overlay — pull request #1011 by marineam (2014-12-16 01:50:35+00:00)
Title: Add docker 1.4 and storage driver auto-detection for testing

With the magic of overlayfs this enables docker to work on ext4 and tmpfs in addition to btrfs.

For the first time docker works by default in our PXE images and it is trivial to switch between btrfs and ext4 based images. :)