Comments - Switch over at a database level
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https://www.digitalocean.com/community/tutorials/how-to-set-up-mysql-master-master-replication
Essentially both servers are slaves of each other. They can both accept writes that will be replicated to each other.
You need to be careful about not writing on both...
server1\db1 server2\db1
Or you'll end up with data issues.
Thanks, I see what you mean now. :)