Thanks for using Bitnami. We highly recommend you to create a server backup so you can revert to a previous state in case your changes do not work
We have a guide about migrating your application database to RDS. The guide linked below configures WordPress as an example, but setting the Pimcore database configuration should be similar.
The database configuration is set in the
/opt/bitnami/apps/pimcore/htdocs/app/config/local/database.yml file. You will need to use
sudo in order to modify that file as it belongs to
daemon (the user running Apache) instead of
Hope it helps,