Select on which host instances are launched
With the appropriate permissions, you can select on which
host instances are launched and which roles can boot instances
on this host.
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 |
+----+---------------------+
Beginning in the Folsom release, the
--availability_zone
zone:host
parameter replaces the
--force_hosts scheduler
hint parameter.
Beginning in the Grizzly release, you can
enable the
create:forced_host
option in the policy.json
file to specify which roles can launch an
instance on a specified host.