On the controller node, install the messaging queue server. Typically this is RabbitMQ Qpid but Qpid RabbitMQ and ZeroMQ (0MQ) are also available. # apt-get install rabbitmq-server # zypper install rabbitmq-server # yum install qpid-cpp-server The rabbitmq-server package configures the RabbitMQ service to start automatically and creates a guest user with a default guest password. The RabbitMQ examples in this guide use the guest account, though it is strongly advised to change its default password, especially if you have IPv6 available: by default the RabbitMQ server enables anyone to connect to it by using guest as login and password, and with IPv6, it is reachable from the outside. To change the default guest password of RabbitMQ: # rabbitmqctl change_password guest RABBIT_PASS Disable Qpid authentication by editing /etc/qpidd.conf file and changing the auth option to no. auth=no To simplify configuration, the Qpid examples in this guide do not use authentication. However, we strongly advise enabling authentication for production deployments. For more information on securing Qpid refer to the Qpid Documentation. After you enable Qpid authentication, you must update the configuration file of each OpenStack service to ensure that the qpid_username and qpid_password configuration keys refer to a valid Qpid username and password, respectively. Start Qpid and set it to start automatically when the system boots. # service qpidd start # chkconfig qpidd on Start the messaging service and set it to start automatically when the system boots: # service rabbitmq-server start # chkconfig rabbitmq-server on Congratulations, now you are ready to install OpenStack services!