RDS Global Database Cluster CDK example

rds-global-database-cluster.ts

import { DatabaseCluster, CfnGlobalCluster, DatabaseClusterProps, CfnDBCluster } from 'aws-cdk-lib/aws-rds'
import { Construct } from 'constructs'

export class GlobalDatabaseCluster extends DatabaseCluster {
  public readonly globalCluster: CfnGlobalCluster

  constructor(scope: Construct, id: string, props: DatabaseClusterProps) {
    super(scope, id, props)

    this.globalCluster = new CfnGlobalCluster(this, 'global-cluster', {
      sourceDbClusterIdentifier: this.clusterIdentifier,
      globalClusterIdentifier: `${scope.node.path}-${id}`,
    })
  }

  addRegionalCluster(scope: Construct, id: string, props: Omit<DatabaseClusterProps, 'credentials' | 'secret'>) {
    const regionalCluster = new DatabaseCluster(scope, id, props)
    const regionalClusterCfn = regionalCluster.node.defaultChild as CfnDBCluster
    regionalClusterCfn.globalClusterIdentifier = this.globalCluster.globalClusterIdentifier

    regionalClusterCfn.masterUsername = undefined
    regionalClusterCfn.masterUserPassword = undefined
    regionalClusterCfn.masterUserSecret = undefined
    if (regionalCluster.secret) {
      regionalCluster.secret.node.tryRemoveChild('Attachment')
      regionalCluster.node.tryRemoveChild('Secret')
    }

    return regionalCluster
  }
}

usage.ts

// app: cdk.App
// vpc: IVpc
// usProps: DatabaseClusterProps
// ukProps: Omit<DatabaseClusterProps, 'credentials' | 'secret'>

const stackUS = new cdk.Stack(app, 'us', {
  region: 'us-east-1',
})

const stackUK = new cdk.Stack(app, 'uk', {
  region: 'eu-west-2',
})

const globalDb = new GlobalDatabaseCluster(stackUS, 'global-db', usProps)
const regionalCluster = globalDb.addRegionalCluster(stackUK, 'uk-db', ukProps)