We're using the original Masakari project for this and it works really well. In fact just last week we lost a compute node and all of VM's were successfully migrated to a reserve host in under 5 minutes. It's a really nice feeling when your infrastructure heals itself before you even get a chance to start troubleshooting.
It does require a good deal of configuration to get it up and running, especially the clustering with Pacemaker/Corosync so be prepared to get familiar with those tools and STONITH if you're not already. Worth it if some of your infrastructure doesn't have redundancy built in at higher level.
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