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When you add the security group rule, choose Custom, then input the ID of the RDS's Security Group (sg-abcdefg)
https://docs.aws.amazon.com/vpc/latest/userguide/VPC_SecurityGroups.html#adding-security-group-rules
In this way, you are whitelisting all instance that use that particular Security Group sg-abcdefg (Including the RDS instance)
To avoid over whitelisting, I would also suggest creating a dedicated Security Group for the RDS instance.
답변함 2년 전
