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Select hosts where instances are launched
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With the appropriate permissions, you can select which
host instances are launched on 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
   :command:`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 :code:`create:forced_host` option in
   the :file:`policy.json` file. By default, this option is
   enabled for only the admin role.

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

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