I know that with AWS ECS's service-discovery you can make one service talk to the other by using the service.cluster pattern at the url (and service discovery does the rest for you). But I want to know if there is a way of doing one instance of a service talk to other container in the same service on AWS Elastic Container Service.
I have searched for this for a while now and decided to ask here as I wasn't able to find any conclusive ideas on how to make it work.
You need to associate your ECS Service with an Application Load Balancer (ALB) which makes sure ECS will registers the tasks (i.e. one or more containers) with the ALB providing a uniform URL for the services to communicate with each other. ALB support path based routing to multiple Target Groups allowing micro-service style communication between tasks/services.
As per the AWS documentation1, you can use a single ALB for multiple services as ALB provides path-based routing and priority-rules. For further information you can also view this link 2 which explains how path-based routing can be used to forward request to different target groups with different ECS tasks/services.
