Recently (earlier today), I blogged about how to use PHPMyAdmin with a MDS instance. I also showed at the end of the video that it’s possible to open MySQL Router on the compute instance to connect from anywhere. However this has security risks of course. Therefor, it’s not recommended.
If you want to connect from on-premise to your MDS instance you should use a VPN or a SSH tunnel. Take a look at these previous post:[Read more]