Promote read replica RDS instance vs read replica Aurora cluster

[peter-csala]

We have used a read replica RDS instance during our MySQL upgrade process from 5.7 to 8.0 to minimize downtime. The read replica promotion worked like a charm from CloudFormation simply removing the SourceDBInstanceIdentifier , thanks to this #334.

The original RDS instance's storage encryption was not enabled at provision time. Even though we have set StorageEncrypted: true on the read-replica the storage was not encrypted.

By running some tests, we have seen that we could use an read replica Aurora cluster to encrypt storage. It works fine but the same trick (remove the ReplicationSourceIdentifier from the CloudFormation template) does not promote the cluster to standalone.

We have seen that AWS CLI and the boto3 client does have a Promote Read Replica Db Cluster command.

Is read replica Aurora cluster promotion supported via CloudFormation?

[zrfr]

No, currently you have to promote the cluster out of band. We'll look into this.

[peter-csala]

Hey @zrfr do you have any news on this? Or can you provide an estimate when can this be implemented?