DBCluster cannot be created from PITR when the source cluster has a custom parameter group

[rupertbg]

When cloning an RDS Aurora MySQL cluster from one account to another that is using a customer parameter group name Cloudformation omits the Parameter Groups that are provided in the template. The following error occurs.

Resource handler returned message: "The cluster parameter group name is required when the source cluster uses a custom parameter group.

The error is InvalidParameterCombinationException because the parameter group settings from the template are not handed to the RDS service.

To fix this the Cloudformation service would need to provide the Parameter Group Name settings set in the AWS::RDS::DBCluster resource to the RDS API call for RestoreDBClusterToPointInTime.

[aslangencer]

We are also severely impacted by this when cloning Aurora databases because we use 100% IaC. The workaround which is clone using CLI/SDK and then CFN import is a burden to maintain.

[milanschuuring]

Our company is heavily affected by this issue. We were planning on using aurora-cloning for 50+ clusters with IaC. A workaround is possible, but is a lot of work to create, test and maintain.