[smueller1234]

Was about to say that we managed upwards of 4k servers worth of MySQL databases (as in 4k baremetal servers worth, not 4k small VMs each having a small MySQL) using "Orchestrator" at Booking.com ten years ago. I checked if it was still kicking before writing this and found that the GitHub repo was archived last year. The next Google hit I find is this article from three days ago:

https://www.percona.com/blog/orchestrator-for-managing-mysql...

Please do some additional research into the state of maintenance of that piece of tech before jumping on it. But it certainly did a lot of powerful things for us back in the day. The automatic promotion of followers was key to our deployment.

[b112]

That, and patching MySQL in weird ways. I recall something about the filesystem layer being monkeyed with, because "who needs safe writes, it slows things down"