External IP Controller

Introduction

One of the possible ways to expose k8s services on a bare metal deployments is using External IPs. Each node runs a kube-proxy process which programs iptables rules to trap requests to External IPs and redirect them to the correct backends.

So, in order to access k8s service from the outside, we just need to route public traffic to one of the k8s worker nodes which have kube-proxy running and thus have all the needed iptables rules for External IPs configured.

Proposed solution

External IP Controller is a k8s application which is deployed on top of k8s cluster and which configures External IPs on k8s worker node(s) to provide IP connectivity.

Demo

How to run tests

Install dependencies and prepare kubernetes dind cluster. It is supposed that Go v.1.7.x has been installed already.

make get-deps

Build necessary images and run tests.

make test

Use make help to see all the options available.