Your installation should include a number of support services such as RabbitMQ for messaging; HAProxy for load balancing, proxying, and HA; GlusterFS for storage; and others. This section provides the procedures to install the services and verify they are up and running.
Warning
The HAProxy state should not be deployed prior to Galera.
Otherwise, the Galera deployment will fail because of
the ports/IP are not available due to HAProxy is already
listening on them attempting to bind to 0.0.0.0.
Therefore, verify that your deployment workflow is correct: