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OpenStack uses a AMQP messaging bus for various components to communicate. By default, this is provided by RabbitMQ, but on RedHat-based systems usually QPID is used.

What the error means, and as you've noted, is that the RabbitMQ/QPID server is not running. Check the logs to determine if it has failed to start for some reason (such as missing the 'rabbit_password' as noted by bvivek), or if there is nothing there try starting it manually using the appropriate init script.

Once RabbitMQ/QPID is started, you should be able to start cinder once again.