stack.ts

import cdk = require('@aws-cdk/cdk');
import ecs = require('@aws-cdk/aws-ecs');
import ec2 = require('@aws-cdk/aws-ec2');
import elbv2 = require('@aws-cdk/aws-elasticloadbalancingv2');
import ecr = require('@aws-cdk/aws-ecr')


export class AppgatewayStack extends cdk.Stack {
  constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);
    const vpc = new ec2.VpcNetwork(this, 'testVPC', {
      maxAZs: 3 // Default is all AZs in region
    });
    const cluster = new ecs.Cluster(this, 'testCluster', {
      vpc: vpc
    });
    const task = new ecs.FargateTaskDefinition(this, 'testTask',{	
      memoryMiB: '512',  // Default is 512
      cpu: '256', // Default is 256
    })
   
    const repo = new ecr.Repository(this, 'testApp', {
	repositoryName: 'testAppRepo' 
    }) 
    const container = task.addContainer('testAppContainer', { 
      image: ecs.ContainerImage.fromEcrRepository(repo, 'latest'), // Required
    }) 
    container.addPortMappings({
	     containerPort: 8080
    })
   
    // Create a load-balanced Fargate service and make it public 
    const service = new ecs.FargateService(this, 'testAppService', {
      cluster,
      taskDefinition: task,
      desiredCount: 2,
    })

    const lb = new elbv2.ApplicationLoadBalancer(this, 'AppLB',  {
	    vpc,
	    internetFacing: true
    });
    const listener = lb.addListener('AppLBListener', {port: 80})
    listener.addTargets('ECS', {port: 80, targets: [service]})
  }
}