[ubuntu] coreos alternatives with docker support

Hi everyone,


i am looking for good coreos alternatives. I heard that ubuntu and intel got good minimal linux dist alternative, but i havent found anything yet.
main features i am looking for:
- automatic updates
- rollback functions
- docker support


yesterday i tried coreos in virtualbox, but it made more fails than achievments. got massive dns problems and its unable to pull some images from the repo. even by following the official how to's
That will be used in a Openstack productive Cloud.


thx forward


regards