You are absolutely right that getting traffic inside the cluster is probably one of most difficult tasks in Kubernetes. The standard ingress objects are too simple when you have a complex deployment. So, we wrote our own Ingress Third Party Resource to fit the needs of our deployment. We use HAProxy. We have been using this in prod for almost a year. You can find it here: https://github.com/appscode/voyager

If you find any issues or have questions, please file Github issues.