Pod is a basic unit of deployment in kubernetes. You can run one or more containers in pod. They will share same network i.e localhost. So you don't need to specify the link url just specify localhost:containerPort

I think you are speaking about single pod multiple container configurations. In kubernetes the small single unit is a pod. So multiple containers in a pod share the same IPC and multiple processes in different container can access via localhost:process port

The containers in same pod shares the localhost, so you need not link containers, just use localhost:containerPort.

You have to use the Kubernetes service (Proxy) https://github.com/GoogleCloudPlatform/kubernetes/blob/master/docs/services.md#how-do-they-work.

Have a look how they work togehter: https://github.com/GoogleCloudPlatform/kubernetes/tree/master/examples/guestbook

To be specific, there is no concept of "linking" similarly to the way Docker does it. Every service endpoint is a fully qualified domain name and you just call it from one container to another, and every label on a container that can be picked up by a service endpoint can be used to direct network traffic. So, you don't have to do ENV["$FOO_BAR_BAZ"] to get the correct IP, just call it directly (curl http://foo_bar_baz).