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+Message queue
+~~~~~~~~~~~~~
+
+OpenStack uses a `message queue` to coordinate operations and
+status information among services. The message queue service typically
+runs on the controller node. OpenStack supports several message queue
+services. This guide implements the RabbitMQ message queue service.
+
+Install the message queue service
+---------------------------------
+
+#. Install the message queue bundle:
+
+  .. code-block:: console
+
+     # clr_bundle_add message-broker-rabbitmq
+
+Configuring the message broker service
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Complete the following steps to configure the message broker service:
+
+#. Message broker service needs to be able to resolve to itself. Add the
+   following line to ``/etc/hosts``
+
+   .. code:: console
+
+    127.0.0.1 controller
+
+#. Start the message broker service and configure it to start when the
+   system boots:
+
+   .. code:: console
+
+    # systemctl enable rabbitmq-server.service
+    # systemctl start rabbitmq-server.service
+
+#. Add the OpenStack user:
+
+  .. code:: console
+
+    rabbitmqctl add_user openstack RABBIT_PASS
+    Creating user openstack ...
+    ...done.
+
+  Replace ``RABBIT_PASS`` with a suitable password.
+
+#. Permit configuration, write, and read access for the OpenStack user:
+
+   .. code:: console
+
+    # rabbitmqctl set_permissions openstack ".*" ".*" ".*"
+    Setting permissions for user "openstack" in vhost "/" ...
+    ...done.