> -----Original Message----- > From: Sean Dague [mailto:sean at dague.net] > > On 02/04/2016 10:25 AM, Grasza, Grzegorz wrote: > > > > Keystone is just one service, but we want to run a test, in which it > > is setup in HA – two services running at different versions, using the same > DB. > > Let me understand the scenario correctly. > > There would be Keystone Liberty and Keystone Mitaka, both talking to a > Liberty DB? > The DB would be upgraded to Mitaka. From Mitaka onwards, we are making only additive schema changes, so that both versions can work simultaneously. Here are the specifics: http://docs.openstack.org/developer/keystone/developing.html#online-migration / Greg