Hello, first of all I suggest you read this article: http://superuser.openstack.org/articles/openstack-upgrading-tutorial-11-pitfalls-and-solutions > What is the best way to performe an upgrade from Juno to Mitaka? I would go for the in place upgrade, but I always upgraded without jumping version, that AFAIK is not supported. The main problem I see, is that database migrations are supported when you upgrade to the next release, but if you jump form Juno to Mitaka I have to idea how the database upgrade cloud be done. Saverio