AWS CDK/CloudFormation管理下のRDS/Auroraインスタンスのバージョンアップが今はすごい簡単な話

import { Stack, StackProps } from 'aws-cdk-lib';
import { Construct } from 'constructs';
import {
  AuroraPostgresEngineVersion,
  DatabaseCluster,
  DatabaseClusterEngine,
} from 'aws-cdk-lib/aws-rds';
import { SubnetType, Vpc } from 'aws-cdk-lib/aws-ec2';

export class DatabaseStack extends Stack {
  public readonly cluster: DatabaseCluster;

  constructor(scope: Construct, id: string, props?: StackProps) {
    super(scope, id, props);

    const vpc = new Vpc(this, 'Vpc', {});

    const cluster = new DatabaseCluster(this, 'MyDatabase', {
      engine: DatabaseClusterEngine.auroraPostgres({
        version: AuroraPostgresEngineVersion.VER_10_18, // before
        // version: AuroraPostgresEngineVersion.VER_11_13, // after
      }),
      instanceProps: {
        vpc,
        vpcSubnets: {
          subnetType: SubnetType.PUBLIC,
        },
        autoMinorVersionUpgrade: false,
      },

      instances: 1,
    });
    this.cluster = cluster;
  }
}

#!/usr/bin/env node

import 'source-map-support/register';
import { App } from 'aws-cdk-lib';
import { DatabaseStack } from '../lib/database-stack';
import { DependentStack } from '../lib/dependent-stack';

const app = new App();
const { cluster } = new DatabaseStack(app, 'DatabaseStack', {
  env: {
    account: process.env.CDK_DEFAULT_ACCOUNT,
    region: process.env.CDK_DEFAULT_REGION,
  },
});
new DependentStack(app, 'DependentStack', {
  clusterName: cluster.clusterIdentifier,
  env: {
    account: process.env.CDK_DEFAULT_ACCOUNT,
    region: process.env.CDK_DEFAULT_REGION,
  },
});

import { RemovalPolicy, Stack, StackProps } from 'aws-cdk-lib';
import { Construct } from 'constructs';
import { Bucket } from 'aws-cdk-lib/aws-s3';

interface DependentStackProps extends StackProps {
  clusterName: string;
}

export class DependentStack extends Stack {
  constructor(scope: Construct, id: string, props: DependentStackProps) {
    super(scope, id, props);

    new Bucket(this, 'Bucket', {
      bucketName: props.clusterName,
      removalPolicy: RemovalPolicy.DESTROY,
    });
  }
}

 npm run cdk diff -- --all

> [email protected] cdk
> cdk "diff" "--all"

Stack DatabaseStack
Resources
[~] AWS::RDS::DBCluster MyDatabase MyDatabase1E2517DB 
 ├─ [~] DBClusterParameterGroupName
 │   ├─ [-] default.aurora-postgresql10
 │   └─ [+] default.aurora-postgresql11
 └─ [~] EngineVersion
     ├─ [-] 10.14
     └─ [+] 11.11
[~] AWS::RDS::DBInstance MyDatabase/Instance1 MyDatabaseInstance12A2ABB05 may be replaced
 └─ [~] EngineVersion (may cause replacement)
     ├─ [-] 10.14
     └─ [+] 11.11

Stack DependentStack

❯ npm run cdk diff -- --all

> [email protected] cdk
> cdk "diff" "--all"

Stack DatabaseStack
Resources
[~] AWS::RDS::DBCluster MyDatabase MyDatabase1E2517DB 
 ├─ [~] DBClusterParameterGroupName
 │   ├─ [-] default.aurora-postgresql10
 │   └─ [+] default.aurora-postgresql11
 └─ [~] EngineVersion
     ├─ [-] 10.14
     └─ [+] 11.11
[~] AWS::RDS::DBInstance MyDatabase/Instance1 MyDatabaseInstance12A2ABB05 may be replaced
 └─ [~] EngineVersion (may cause replacement)
     ├─ [-] 10.14
     └─ [+] 11.11

Stack DependentStack
There were no differences