As mentioned previously, ECS provides an orchestrator that takes care of allocating the containers across our Auto Scaling Group. It also keeps track of which port each container uses and integrates with ALB so that our load balancer can correctly route the incoming traffic to all containers running a given service. ECS supports both the ELB and ALB services but the ALB gives more flexibility when working with containers. We will demonstrate how to create an ALB using CloudFormation through Troposphere.
We will start by creating a new file and calling it helloworld-ecs-alb-cf-template.py. We will then put our usual import, and will create our template variable and add a description, as follows:
"""Generating CloudFormation ...
