Sometimes customers want to have a very simple Galera Cluster set-up. They do not want to invest into machines and build up the know-how for load balancers in front of the Galera Cluster.
For this type of customers there is a possibility to just run a VIP controlled by Corosync/Pacemaker in front of the Galera Cluster moving an IP address from one node to the other. But this is just an active/passive/passive set-up and reads and writes are only possible to one node at the time.
So you loose the scaling …
