I'm new to cloud, and VERY new to OpenStack. I've used, and built, VMWare vSphere and Hyper-V clusters, so I know a bit. OpenStack looks, at 1st glance, usefull to me, but some things isn't clear to me. I'm 1 of the old dudes, so virtual enviroment was/is kind of abstract. I have managed to accept/understand virtualization though. Cloud is not making things better. :)

I've watched a number of OpenStack videoes and read a lot, but 1 thing eludes me completely. When installing, you need to provide Glancehost and Rabbithost. I figured out the Glance is the "equevelent" of Microsoft WDS, more or less. Rabbit is HA controller.

To have a HA cluster I need Rabbit, so far so good. But can the Rabbit host be a guest? What if the host that holds Rabbit guest go down?

In essence: Does Rabbit configure hosts to function/failover even if Rabbit is down? Or do Rabbit control/initiate the failover?