Open Stack

I am working on setting up Openstack for HA and one of the last orders of 
business is getting HA behavior out of the compute nodes. Is there a project 
that will automatically evacuate instances from a downed or failed compute 
host, and automatically reboot them on their new host? I'm curious what 
suggestions people have about this, or whatever advice you might have. Is 
there a best way of getting this functionality, or anything else I should be 
aware of?

Thanks,