Container Networking

Chapter 7. Kubernetes Networking

This chapter will first quickly bring you up to speed concerning Kubernetes, then introduce you to the networking concepts on a high level. Then we’ll jump into the deep end, looking at how container networking is realized in Kubernetes, what traffic types exist and how you can make services talk to each other within the cluster, as well as how you can get traffic into your cluster and to a specific service.

A Gentle Kubernetes Introduction

Kubernetes is an open source container orchestration system. It captures Google’s lessons learned from running containerized workloads on Borg for more than a decade. As of early 2018 Kubernetes is considered the de facto industry standard for container orchestration, akin to the Linux kernel for the case of a single machine.

Note

I’d argue that there are at least two significant points in time concerning the birth of Kubernetes. The first was on June 7, 2014, with Joe Beda’s initial commit on GitHub that marked the beginning of the open sourcing of the project. The second was almost a year later, on July 20, 2015, when Google launched Kubernetes 1.0 and announced the formation of a dedicated entity to host and govern Kubernetes, the Cloud Native Computing Foundation (CNCF). As someone who was at the launch event (and party), I can tell you, that’s certainly one way to celebrate the birth of a project.

Kubernetes’s architecture (Figure 7-1) provides support for a number of workloads, allowing ...