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Select hosts where instances are launched
=========================================

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 :option:`--availability_zone ZONE:HOST` parameter on the
   :command:`nova boot` command.

   For example:

   .. code-block:: console

      $ 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
   :command:`nova hypervisor-list` command.

   .. code-block:: console

      $ nova hypervisor-list

      +----+---------------------+
      | ID | Hypervisor hostname |
      +----+---------------------+
      | 1  | server2             |
      | 2  | server3             |
      | 3  | server4             |
      +----+---------------------+