OpenStack actually does this really well, using RabbitMQ as the messaging tool.<p><a href="https:&#x2F;&#x2F;wiki.openstack.org&#x2F;wiki&#x2F;Oslo&#x2F;Messaging" rel="nofollow">https:&#x2F;&#x2F;wiki.openstack.org&#x2F;wiki&#x2F;Oslo&#x2F;Messaging</a>