Check out Project Atomic http://www.projectatomic.io/. Or its downstream project RHEL Atomic Host. The whole update process for the host is much simpler. Read more abou it here: http://rhelblog.redhat.com/2015/04/01/red-hat-enterprise-lin...

Note: I am not related to Redhat, but we are considering Docker, too. And we are evaluating how would Atomic fit in our infrastructure.