Summary

In this chapter, we covered three major topics: working with the Kubernetes API, extending the Kubernetes API, and writing Kubernetes plugins. The Kubernetes API supports the OpenAPI spec and is a great example of REST API design that follows all current best practices. It is very consistent, well organized, and well documented. Yet it is a big API and not easy to understand. You can access the API directly via REST over HTTP, using client libraries including the official Python client, and even by invoking Kubectl.

Extending the Kubernetes API involves defining your own third-party-resources. These are most effective when you combine them with additional custom plugins or when you query and update them externally.

Plugins are a foundation of Kubernetes design, and it was always meant to be extended by users to accommodate any needs. We looked at various plugins you can write and how to register and integrate them seamlessly with Kubernetes.

At this point, you should be well aware of...