EC2 + RDS シングルAZ構成

import * as cdk from "aws-cdk-lib";
import { Construct } from "constructs";
import * as ec2 from "aws-cdk-lib/aws-ec2";
import * as rds from "aws-cdk-lib/aws-rds";

export class Ec2RdsSingleAzStack extends cdk.Stack {
  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    const vpc = new ec2.Vpc(this, "Vpc", { maxAzs: 2, natGateways: 1 });
    const web = new ec2.Instance(this, "WebServer", {
      vpc,
      instanceType: new ec2.InstanceType("t3.small"),
      machineImage: ec2.MachineImage.latestAmazonLinux2023(),
      vpcSubnets: { subnetType: ec2.SubnetType.PRIVATE_WITH_EGRESS },
    });

    const db = new rds.DatabaseInstance(this, "Database", {
      vpc,
      engine: rds.DatabaseInstanceEngine.postgres({
        version: rds.PostgresEngineVersion.VER_16,
      }),
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.T3, ec2.InstanceSize.MEDIUM),
      allocatedStorage: 100,
      storageEncrypted: true,
      multiAz: false,
    });

    db.connections.allowDefaultPortFrom(web);
  }
}