Book Image

Mastering Kubernetes

By : Gigi Sayfan
Book Image

Mastering Kubernetes

By: Gigi Sayfan

Overview of this book

Kubernetes is an open source system to automate the deployment, scaling, and management of containerized applications. If you are running more than just a few containers or want automated management of your containers, you need Kubernetes. This book mainly focuses on the advanced management of Kubernetes clusters. It covers problems that arise when you start using container orchestration in production. We start by giving you an overview of the guiding principles in Kubernetes design and show you the best practises in the fields of security, high availability, and cluster federation. You will discover how to run complex stateful microservices on Kubernetes including advanced features as horizontal pod autoscaling, rolling updates, resource quotas, and persistent storage back ends. Using real-world use cases, we explain the options for network configuration and provides guidelines on how to set up, operate, and troubleshoot various Kubernetes networking plugins. Finally, we cover custom resource development and utilization in automation and maintenance workflows. By the end of this book, you’ll know everything you need to know to go from intermediate to advanced level.
Table of Contents (22 chapters)
Mastering Kubernetes
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Writing Kubernetes plugins


In this section, we will dive into the guts of Kubernetes and learn to take advantage of its famous flexibility and extensibility. We will learn about different aspects that can be customized via plugins and how to implement such plugins and integrate them with Kubernetes.

Writing a custom scheduler plugin

Kubernetes defines itself as a container scheduling and management system. As such, the scheduler is the most important component of Kubernetes. Kubernetes comes with a default scheduler, but allows writing of additional schedulers. To write your own custom scheduler you need to understand what the scheduler does, how it is packaged, how to deploy your custom scheduler, and how to integrate your scheduler. The scheduler source code is available here:

https://github.com/kubernetes/kubernetes/blob/master/plugin/pkg/scheduler.

In the rest of this section, we will dive deep into the source and examine data types, algorithms, and code.

Understanding the design of the...