AWS Lambda Managed Instances でコールドスタートが発生しないことを確認してみた

import { Logger } from "@aws-lambda-powertools/logger";
import { Context } from "aws-lambda";

/**
 * ロガーの初期化
 */
const logger = new Logger();

/**
 * ハンドラー
 */
export const handler = async (context: Context): Promise<void> => {
  logger.addContext(context);

  logger.info("Hello, LMI");
};

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

import { DefaultFunctionConstruct } from "./constructs/default-function";
import { VpcConstruct } from "./constructs/vpc";

export class SampleStack extends cdk.Stack {
  constructor(scope: Construct, id: string) {
    super(scope, id);

    /**
     * VPC 作成
     */
    const vpcConstruct = new VpcConstruct(this, "Vpc");
    const vpc = vpcConstruct.vpc;

    /**
     * セキュリティグループ作成
     *
     * MEMO: Capacity Provider 用に作成
     */
    const securityGroup = new ec2.SecurityGroup(this, "SecurityGroup", {
      vpc,
    });

    /**
     * Capacity Provider 作成
     *
     * MEMO: LMI のコア要素となるリソース
     */
    const capacityProvider = new lambda.CapacityProvider(
      this,
      "CapacityProvider",
      {
        subnets: vpc.selectSubnets({
          subnetType: ec2.SubnetType.PRIVATE_WITH_EGRESS,
        }).subnets,
        securityGroups: [securityGroup],
      },
    );

    /**
     * LMI 用 Lambda 関数作成
     */
    const lmiFunction = new lambda_nodejs.NodejsFunction(this, "LmiFunction", {
      entry: "src/handler.ts",
      runtime: lambda.Runtime.NODEJS_24_X, // LMI では Node.js 22.x 以上が必須
      memorySize: 2048, // LMI では 2048MB 以上が必須
      tracing: lambda.Tracing.ACTIVE, // コールドスタート発生状況の観測のために、AWS X-Ray を有効化
    });

    /**
     * Capacity Provider に Lambda 関数を追加
     */
    capacityProvider.addFunction(lmiFunction);

    /**
     * 比較のためのデフォルト設定の Lambda 関数作成
     */
    new DefaultFunctionConstruct(this, "DefaultFunction");
  }
}

8:55:42 PM | CREATE_FAILED        | AWS::Lambda::Function                 | LambdaFunctionBF21E41F
Resource handler returned message: "Runtime Enum nodejs16.x does not support specified feature: Lambda Managed Instances (Service: Lambda, Status Code: 400, Request ID: 775b935f-0cdb-45
97-8ed1-755181991c5a) (SDK Attempt Count: 1)" (RequestToken: 0b0e7e16-980b-8f79-1a44-63310f922e12, HandlerErrorCode: InvalidRequest)