使用 CDK 创建不带 NAT 网关的 AWS RDS 实例

Question

是否可以创建 serverless RDS cluster via CDK without NAT Gateway? The NAT Gateway base charge is pretty expensive for a development environment. I'm also not interested in setting up a NAT instance. I'm attaching a Lambda in the VPC with the RDS instance like this.

    // VPC
    const vpc = new ec2.Vpc(this, 'MyVPC');

    // RDS
    const dbCluster = new rds.ServerlessCluster(this, 'MyAuroraCluster', {
      engine: rds.DatabaseClusterEngine.AURORA_MYSQL,
      defaultDatabaseName: 'DbName',
      vpc,
    });

Answer 1

无服务器集群不能放入 public 子网。

这是 RDS Serverless 的硬性记录限制。

Answer 2

是的，你可以。您可能必须添加一些 VPC 端点（如 Secrets Manager）才能完成密码轮换，但这是可能的。您将需要创建一个包含没有 NAT 网关的子网的 VPC。

// VPC
const vpc = new ec2.Vpc(this, 'MyVPC', {
  natGateways: 0,
  subnetConfiguration: [
    {
      cidrMask: 24,
      name: 'public',
      subnetType: ec2.SubnetType.PUBLIC,
    },
    {
      cidrMask: 28,
      name: 'rds',
      subnetType: ec2.SubnetType.ISOLATED,
    }
  ]
});

// RDS
const dbCluster = new rds.ServerlessCluster(this, 'MyAuroraCluster', {
  engine: rds.DatabaseClusterEngine.AURORA_MYSQL,
  defaultDatabaseName: 'DbName',
  vpcSubnets: {
    subnetType: ec2.SubnetType.ISOLATED,
  },
  vpc,
});

如果您想要 Secrets Manager 控制密码，请使用：

vpc.addInterfaceEndpoint('SecretsManagerEndpoint', {
  service: ec2.InterfaceVpcEndpointAwsService.SECRETS_MANAGER,
});

dbCluster.addRotationSingleUser();