Why is the RDS Certificate authority default still the rds-ca-2019?

Question

When provisioning an RDS instance with MariaDB through the AWS Console or CloudFormation, the default certificate authority is set to "rds-ca-2019". It's important to note that this certificate is set to expire on August 22nd, 2024. Prior to this expiration date, it will be necessary to initiate a reboot. If not done manually, AWS will automatically reboot the instance to apply a newer certificate. It raises the question: Why isn't a certificate with a longer validity period set as the default? This would eliminate the need for an additional reboot shortly after the RDS instance is created.

Answer

You will have to set the accounts/regions default certificate using the following process for all new created instances going forward.

https://docs.aws.amazon.com/cli/latest/reference/rds/modify-certificates.html

When provisioning you can also define the SSL certificate during creation.

Why is the RDS Certificate authority default still the rds-ca-2019?

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