如何获得亚马逊极光的IDatabaseInstance

Question

    const dbCluster = new rds.DatabaseCluster(this, 'Database', {
      parameterGroup,
      engine: engine,
      credentials: rdsCredentials,
      cloudwatchLogsExports:['slowquery','general','error','audit'],
      backup: backupProps,
      instances:instances,
      storageEncrypted:true,
      removalPolicy: cdk.RemovalPolicy.DESTROY,
      clusterIdentifier: dbInfos['cluster'], //clusterIdentifier,
      defaultDatabaseName :dbInfos['database'], //defaultDatabaseName,
      instanceProps: {
        instanceType: instanceType,
        vpcSubnets:props.vpc.selectSubnets({ subnetType: ec2.SubnetType.PRIVATE_ISOLATED }),
        vpc:props!.vpc,
        securityGroups:[dbSecurityGroup],
      },
      subnetGroup:subnetGroup
    });

    new rds.DatabaseInstanceReadReplica(this, 'ReadReplica', {
      sourceDatabaseInstance: dbCluster, // error

      instanceType: ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.SMALL),
      vpc,
    });

在sourceDatabaseInstance: dbCluster上出现了错误

    Type 'DatabaseCluster' is missing the following properties from type 'IDatabaseInstance': instanceIdentifier, instanceArn, dbInstanceEndpointAddress, dbInstanceEndpointPort, and 6 more.ts(2740)
    instance.d.ts(676, 14): The expected type comes from property 'sourceDatabaseInstance' which is declared here on type 'DatabaseInstanceReadReplicaProps'

现在，我正试图在Amazon Aurora中添加read副本：

rds.DatabaseInstanceReadReplica.html

DatabaseInstanceReadReplica接受sourceDatabaseInstance作为IDatabaseInstance

然而，Aurora有cluster，但没有instance。

那么我应该在这里设置什么呢？

Answer 1

使用实例支柱添加Aurora副本：

instances: 3; // = 1 writer + 2 replicas

正如极光复制品文档所说：

当您在Aurora提供的DB集群中创建第二个、第三个等等DB实例时，Aurora会自动设置从写入DB实例到所有其他DB实例的复制。这些其他DB实例是只读的，被称为Aurora副本。在讨论如何将编写器和读取器DB实例组合到集群中时，我们还将它们称为读取器实例。