Shouldn't be so difficult to create a new database in RDS and modify the WordPress' configuration to use that new database instead of the local one.
This is correct, but if you want to have a centralized database, that's the only approach.
You have another alternative, you can use our WordPress with RDS solution
This solution launches different RDS instances for every deployment. This deployment will improve the performance of the Bitnami singleVM solutions and won't have the problem of all the sites being down if the RDS database is down.
Happy to help!
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