LISA19 - Deep Dive into Kubernetes Internals for Builders and Operators

Jérôme Petazzoni explains the inner workings of the Kubernetes control plane and builds a simplified cluster component by component.

Deep Dive into Kubernetes Internals for Builders and Operators Jérôme Petazzoni, Tiny Shell Script LLC If you operate (or plan to operate) Kubernetes, it's helpful to understand its internals: what are the components of the control plane? What are their respective roles? How do they communicate? To get the most out of this talk, you should be familiar with basic Kubernetes concepts like deployments, pods, and services. We'll start by explaining exactly what happens between the execution of commands like "kubectl run" and "kubectl expose" and the moment when the containers are actually running and available on the cluster. Then we'll build a simplified cluster, one component at a time, until it can execute that "kubectl run" command, and we'll see that it's not as complicated as it sounds. We will show how kube-proxy provides connectivity to services, and how CNI plugins provide connectivity to pods themselves. Finally, we'll highlight some of the differences between that experiment and a production-grade cluster. View the full LISA19 Program at usenix.org/conference/lisa19/conference-program