Simple ECS Demo Application

Application

The application consists of a Python web server rendering basic information and offering this at the root path of the server.

The container image used is available at Docker Hub.

ECS setup using Cloud Development Kit (CDK)

The ECS cluster will run in a new VPC with CIDR 10.1.0.0/16. To keep the management overhead low it will be powered by Fargate.

A service and a task definition are created:

• The task definition contains the information about the container (e.g. port mappings)
• The service defines e.g. the desired count of running tasks.

After the cluster has been deployed via

cdk deploy

the DNS name of the load balancer is returned/ printed to the console.

Troubleshooting

• Can not pull image I stumbled upon this during tests with Fargate and EC2 based Elastic Container service. For Fargate I updated the task definition by setting assignPublicIp to true.

Links

• Flask Hello World
• AWS Cloud Development Kit
• AWS Fargate
• Task cannot pull image