Lightsail container communication

Question

I currently have a Lightsail container service deployment with two containers.  One container needs to make a *server-side* http call (a Python request) to the other container, which is running a REST api.  This works fine locally with `docker compose` but the connection is refused in the Lightsail deployment.

The Lightsail docs [here](https://lightsail.aws.amazon.com/ls/docs/en_us/articles/amazon-lightsail-container-services-deployments) seems to indicate this is possible by using the private domain and the open port of the container.  ie For container service `foo`, and a container within that service listening on port 6000,  you should be able to access that container within the private domain at `foo.service.local:6000`.   This is what I tried leading to the connection refused error.

But there is also a section [here](https://lightsail.aws.amazon.com/ls/docs/en_us/articles/amazon-lightsail-container-services-deployments#communication-between-containers) that says to open communications via environment variable.  I don't quite understand this.  Does anyone have examples of this?

Any help with either method to get communication between containers working would be appreciated.

Answer

The problem I had is actually with the service within the container (was unresponsive), not the inter-container communication.   I sanity tested with a different viable service and was able to reach from one container to another using the private domain as stated in the documentation.

Just to be clear, for a deployment `foo` with two containers A and B, with container B listening on port 6000, A is able to make http requests to B using host `foo.service.local:6000`.

Answer

Hello.  
Is it possible to communicate when accessing with "localhost:6000"?

Lightsail container communication

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