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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
``--availability-zone ZONE:HOST:NODE`` parameter on the :command:`openstack
server create` command.
For example:
.. code-block:: console
$ openstack server create --image IMAGE --flavor m1.tiny \
--key-name KEY --availability-zone ZONE:HOST:NODE \
--nic net-id=UUID SERVER
.. note::
HOST and NODE are optional parameters. In such cases, use the
``--availability-zone ZONE::NODE``, ``--availability-zone ZONE:HOST`` or
``--availability-zone ZONE``.
#. 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. If you see ``Forbidden (HTTP
403)`` in return, then you are not using admin credentials.
#. To view the list of valid zones, use the :command:`openstack availability
zone list` command.
.. code-block:: console
$ openstack availability zone list
+-----------+-------------+
| Zone Name | Zone Status |
+-----------+-------------+
| zone1 | available |
| zone2 | available |
+-----------+-------------+
#. To view the list of valid compute hosts, use the :command:`openstack host
list` command.
.. code-block:: console
$ openstack host list
+----------------+-------------+----------+
| Host Name | Service | Zone |
+----------------+-------------+----------+
| compute01 | compute | nova |
| compute02 | compute | nova |
+----------------+-------------+----------+
#. To view the list of valid compute nodes, use the :command:`openstack
hypervisor list` command.
.. code-block:: console
$ openstack hypervisor list
+----+---------------------+
| ID | Hypervisor Hostname |
+----+---------------------+
| 1 | server2 |
| 2 | server3 |
| 3 | server4 |
+----+---------------------+
|
