I think that's an interesting point - but clustering resources like we do is more about performance and load balancing than being hacked. Honestly, I don't think because a service has down time it's more secure than one that is in a resource sharing situation. But I do get your point, for instance, if you had a mariadb cluster that got hacked, the data would be corrupted across all of the cluster - but, that's why we keep backups. Having a database cluster for instance allows us to load balance request across the cluster which provides latency on the databases and removes lag.
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