How to make custom DNS for RDS instance?

Hi,

It depends on what you already have. If you have your Route53 hosted zone, it will be as simple as:

1. Create a CNAME record and point it to the DNS name of your RDS instance

The downside of this approach is big enough, so I would not recommend doing it just to have a nice name:

1. If you have a public hosted zone, you will unveil your RDS name to the internet
2. You can't use a TLS connection with FQDN check.