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You can not have HA with 2 nodes. You will achieve falt-tolerance with this setup. But if one node goes down you will have locked services especially with galera cluster, that locks db when there is only one mysql node available to not allow corruption to occur. Other services will also lock untill the node is back online (rabbitmq, memcache etc., openstack services aswell).

But it will preserve the last state of services untill the second controller comes back online!