Book Image

Kubernetes for Developers

By : Joseph Heck
Book Image

Kubernetes for Developers

By: Joseph Heck

Overview of this book

Kubernetes is documented and typically approached from the perspective of someone running software that has already been built. Kubernetes may also be used to enhance the development process, enabling more consistent testing and analysis of code to help developers verify not only its correctness, but also its efficiency. This book introduces key Kubernetes concepts, coupled with examples of how to deploy and use them with a bit of Node.js and Python example code, so that you can quickly replicate and use that knowledge. You will begin by setting up Kubernetes to help you develop and package your code. We walk you through the setup and installation process before working with Kubernetes in the development environment. We then delve into concepts such as automating your build process, autonomic computing, debugging, and integration testing. This book covers all the concepts required for a developer to work with Kubernetes. By the end of this book, you will be in a position to use Kubernetes in development ecosystems.
Table of Contents (16 chapters)
Title Page
Packt Upsell
Contributors
Preface
Index

Custom Resource Definition


Stateful Sets don't automatically match all the persistent stores that are available, and some of them have even more complex logic requirements for managing the life cycle of the application. As Kubernetes looked at how to support extending its controllers to support more complex logic, the project started with the idea of Operators, external code that could be included in the Kubernetes project, and has evolved as of Kubernetes 1.8 to make this more explicit with CustomResourceDefinitions. A custom resource extends the Kubernetes API, and allows for custom API objects to be created and matched with a custom controller that you can also load into Kubernetes to handle the life cycle of those objects.

Note

Custom Resource Definitions go beyond the scope of what we will cover in this book, although you should be aware that they exist. You can get more details about Custom Resource Definitions and how to extend Kubernetes at the project's documentation site: https:...