ApplicationLoadBalancedFargateService does not work with existing VPC

Question

I am trying to create ECS service using the example provided in the page https://docs.aws.amazon.com/cdk/v2/guide/ecs_example.html. It works fine if a VPC is created as part of the code. But if I use an existing VPC, the tasks are not coming up. 
```
export class FargateExistingVpcStack extends cdk.Stack {
  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

const vpc = ec2.Vpc.fromLookup(this, 'DefaultVPC', { isDefault: true });

const cluster = ecs.Cluster.fromClusterAttributes(this, "MyCluster", {
      clusterName: 'JobCluster',
      vpc: vpc,
      securityGroups: []
    });

//clusterArn Create a load-balanced Fargate service and make it public
    new ecs_patterns.ApplicationLoadBalancedFargateService(this, "MyFargateService", {
      cluster: cluster, // Required
      desiredCount: 1, // Default is 1
      taskImageOptions: { image: ecs.ContainerImage.fromRegistry("amazon/amazon-ecs-sample") },
      publicLoadBalancer: true, // Default is true,
    });  
  }
}
```
What could be the possible reasons that tasks are not coming up?

Darren Harris · Answer

What network mode is your task definition configured to use?
Does your default VPC allow access to the Internet?
To access the image from ECR, you'll either need Internet access from your VPC or create a private link

ApplicationLoadBalancedFargateService does not work with existing VPC

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