Comments - Galera Cluster - Adding node after crash
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Does this galera documentation - https://galeracluster.com/library/training/tutorials/restarting-cluster.html help (looks to be 2014 at the moment).
There is also the galera-new-cluster - https://galeracluster.com/library/documentation/crash-recovery.html recommends this.
Galera Arbitrator has very limited use, so I'd stick to a few actual nodes rather than this testing utility (that has a limited production use on more than 3 nodes sometimes).