Metro-DR (Synchronous replication across 2 physical servers)

[Aniket-IN]

Hi,

I'm super new to the whole DevOps world.
Have worked with Docker a lot, started learning K8s.

I have two physical servers few miles away (latency is 3-4ms)
Looking for a Zero RPO solution, like we should always have the Primary Server replicated to the Standy Server.
We should be easily able to failover to Standby server and make that primary when needed.

And same way, switch back to Primary server safely after syncing it back.

Can someone please, give some guidance what things I should learn?
There are many things, and I'm totally confused from where to start.

Thank you so much in advance :)