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Hi Vignesh, though we sometimes do document what is not possible, I'm not aware of a document that would explain why you cannot connect directly to RDS using SSM. So let me resort to a more generic answer:
SSM allows many more functions - and changes! - to an instance than just connecting to it. Having full SSM functionality on an RDS instance thus would undermine the Shared Responsibility Model we use for RDS (you could also say: it would violate the "Black Box" principle of RDS). Therefore, you need an intermediary instance that forwards the TCP Port exposed by RDS to your local machine.
Further reading:
- The RDS-specific Shared Responsibility Model is explaine in "Security in Amazon RDS"
- Our general overview of the Shared Responsibility Model
- In case you don't know already, the EC2 instance can be in a private subnet, too, as explained here: Securely connect to an Amazon RDS or Amazon EC2 database instance remotely with your preferred GUI
If this helped you, kindly mark my answer as "accepted". Kind regards, Uwe
beantwortet vor 2 Jahren
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Thank you for your response. Could you please briefly tell me about the "Black Box" principle of RDS? @Uwe
Though "Black Box" is not official AWS wording, I used it to describe the fact that RDS as a managed system isn't as open to connect to or apply changes (e.g. OS Kernel settings) as a custom install on EC2 would be. It's because of the responsibility AWS takes for RDS's availability and security that some functionality you'd have on a self-managed database server isn't available to you on RDS. Or, in other words: you get a certain service, but the way this service is configured and managed isn't published in detail (and may be changing over time). HTH, Uwe
Thanks, @Uwe. That's a great explanation. Much appreciated
@Uwe I have another question related to this connecting from the docker container. Please share if you have any docs any ideas https://repost.aws/questions/QUGuUewImyTiabU7R946zD9w/from-docker-container-need-to-connect-rds-using-session-manager