Select hosts where instances are launched

To select the host where instances are launched, use the --availability_zone zone:host parameter on the nova boot command,

For example:

$ nova boot --image <uuid> --flavor m1.tiny --key_name test --availability-zone nova:server2

To specify which roles can launch an instance on a specified host, enable the create:forced_host option in the policy.json file. By default, this option is enabled for only the admin role.

To view the list of valid compute hosts, use the nova hypervisor-list command, as follows:

$ nova hypervisor-list
+----+---------------------+
| ID | Hypervisor hostname |
+----+---------------------+
| 1  | server2             |
| 2  | server3             |
| 3  | server4             |
+----+---------------------+