aws-rds - Impossible to define a DatabaseInstanceReadReplica from a DatabaseCluster

Aurora Cluster Replication

I’m trying to create a cross-region read replica from an Aurora Cluster.

How can I provide a sourceDatabaseInstance from a DatabaseCluster instance?

https://docs.aws.amazon.com/cdk/api/latest/docs/aws-rds-readme.html

const cluster = new DatabaseCluster(this, 'database-cluster', props);

const readReplica = new DatabaseInstanceReadReplica(this, 'read-replica', {
  sourceDatabaseInstance: ???
})

Environment

• CDK CLI Version: 1.22.0
• Module Version: 1.15.0
• OS: OSX Mojave
• Language: TypeScript

Other information

Ideally, the cluster object could provide us with its replica database instances.

Alternatively, we could compute the instance Arn from cluster.instanceIdentifiers and change the signature of the DatabaseInstanceReadReplicaProps from readonly sourceDatabaseInstance: IDatabaseInstance; to readonly sourceDatabaseInstanceArn: string;

Thanks,

[AustinMaddox]

Thanks @skinny85 I do realize that fact. I guess the real problem is there isn’t a construct that exists for what I’m trying to do. I imagine it would be called DatabaseClusterReadReplica rather than DatabaseInstanceReadReplica if it did exist.

Any alternatives or workaround to create a read replica of a cluster (or member instance writer/reader of a cluster)?

[skinny85]

I’m not sure. Do you know how would you set it up using CloudFormation by any chance?