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You can use the evacuate call in the nova project and script it but at least use a shared storage so that you can just migrate your instances to other comoute node other than the one that fails. However this not the service level HA that we seek(services auto start and failover, heartbeat, monitoring) But, go to brightcomputing.com you can find that they made a very cool solution for openstack clusters. you can deploy it with a very cool management tool and give rolles to the BARE-METAL NODES then their node installer handles the nodes and deploy it. They have a failover mechanism and heartbeat services, autostars, their own cli managment tool for hpc, hadoop and openstack. it's really nice enviroment for prodution systems