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Nowadays there isn't any openstack component that automatically detect failed compute nodes and execute the migration (or VM evacuation ) of the VM executed in the failed host.

There is the command "nova evacuate" that require shared storage but it's a command that an admin should execute for each vm.

For automatic evacuation there are only openstack blueprint ( ) or custom solution ( ).

In order to obtain high available openstack instances, you can use vCenter as Openstack compute node ( ) and configura a vSphere cluster with two or more ESXi with HA feature enabled, but there is some limitation about using it with openstack.