Kubernetes + Envoy… so how load balance connections from inside the cluster to servers outside the cluster

Introduction

When we think about connecting from a pod in a Kubernetes cluster to a some server for example MySQL outside the cluster, I think that Envoy seems to be a good idea 🙂

In this article I will describe method how do it, so I hope it will be helpful for those who are wondering how do it.

Example diagram

Configuration

In configmap we have summarized envoy settings.

Deployment and service configuration for Envoy and Nginx+php-fpm

Now just apply these configurations

$ kubectl apply -f envoy.yaml
$ kubectl apply -f envoy_nginx_phpfpm.yaml

Now we can connect to external MySQL from the php-fpm container.