Break the cluster could be interesting if you can have both old and new vip active. if you disconnect the master from the network, the backup will do the job. You can then remove the second node from the cluster config, change addressing, then check on the one node new vip cluster if everything works fine. As the internal VIP is the same, you can't plug the one node new cluster back into the network without shutting down the second node. If everything is ok with the new VIP you can delete cluster config on the second node, recreate and put it back into the cluster.
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