AWS CDK - using javascript

cdk-1-stack.js

const cdk = require('@aws-cdk/core');
const ec2 = require('@aws-cdk/aws-ec2');
const ecs = require('@aws-cdk/aws-ecs');
const ecs_patterns = require ('@aws-cdk/aws-ecs-patterns');

class Cdk1Stack extends cdk.Stack {

  constructor(scope, id, props) {
    super(scope, id, props);

    // The code that defines your stack goes here
    //create vpc
    this.vpc = new ec2.Vpc(this, 'vpc', {
      maxAZs: 2,
      natGateways: 1
    });
    
    //create ECS cluster
    this.cluster = new ecs.Cluster(this, 'ecsCluster',{
      vpc: this.vpc
    });
    
    //add instances t2.micro for free tier
    this.cluster.addCapacity('DefaultAutoScalingGroup', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.T2, ec2.InstanceSize.MICRO)
    });
    
    //add container by using ecs_pattern
    this.ecsServicePHP = new ecs_patterns.LoadBalancedEc2Service(this, 'ecsEc2ServicePHP', {
      cluster: this.cluster,
      memoryLimitMiB: 400,
      image: ecs.ContainerImage.fromRegistry("amazon/amazon-ecs-sample")
    });
  }
}

module.exports = { Cdk1Stack }