How to: How can containers within a pod communicate with each other?
Containers within a pod share networking space and can reach other on `localhost`. For instance, if you have two containers within a pod, a MySQL container running on port 3306, and a PHP container running on port 80, the PHP container could access the MySQL one through `localhost:3306`.

Learn more: https://github.com/kubernetes/kubernetes/blob/release-1.4/docs/design/networking.md#container-to-container