Chapter 18. Extending Kubernetes

You’re almost done. To wrap up, we’ll look at how you can define your own API objects and create controllers for those objects. We’ll also look at how others have extended Kubernetes and built Platform-as-a-Service solutions on top of it.

18.1. Defining custom API objects

Throughout the book, you’ve learned about the API objects that Kubernetes provides and how they’re used to build application systems. Currently, Kubernetes users mostly use only these objects even though they represent relatively low-level, generic concepts.

18.1.1. Introducing CustomResourceDefinitions

18.1.2. Automating custom resources with custom controllers

18.1.3. Validating custom objects

18.1.4. Providing a custom API server for your custom objects

18.2. Extending Kubernetes with the Kubernetes Service Catalog

18.2.1. Introducing the Service Catalog

18.2.2. Introducing the Service Catalog API server and Controller Manager

18.2.3. Introducing Service Brokers and the OpenServiceBroker API

18.2.4. Provisioning and using a service

18.2.5. Unbinding and deprovisioning

18.2.6. Understanding what the Service Catalog brings

18.3. Platforms built on top of Kubernetes

18.3.1. Red Hat OpenShift Container Platform

18.3.2. Deis Workflow and Helm

18.4. Summary