When you want to move all instances from one compute host to another, you can use the nova host-servers-migrate command. The difference between this command and the nova evacuate command is that you can specify the host when evacuating. Also when evacuating, you must configure shared storage on the target host so that user data is preserved on the server disk. See Evacuate instances. To list the host you want to migrate, run: $ nova service-list After selecting a host from the list, run this command: $ nova host-servers-migrate HOST_NAME Where HOST_NAME is the name of the host you want the servers to go to. All instances are booted from a new host while preserving their current configurations, including ID, name, UUID, IP address, and so on.