The Kubernetes Operator Framework Book

A hands-on guide to designing and deploying an operator for personal use and public distribution, writing, packaging, and distributing a basic operator with the Kubernetes cluster in code

Key Features

• Gain a holistic understanding of operators and the Operator Framework
• Learn to design and develop your own operators as per industry standards
• Find out how to implement best practices and troubleshoot Kubernetes operators

Book Description

From incomplete collections of knowledge and varying design approaches to technical knowledge barriers, Kubernetes users face lots of challenges when developing their own operators. Knowing how to write, deploy, and pack operators will make cluster management automation much easier - and that's what this book is here to teach you.

Beginning with operators and Operator Framework fundamentals, the book delves into how the different components of the Operator Framework (such as the Operator SDK, Operator Lifecycle Manager, and OperatorHub.io) are used to build operators. You'll learn how to write a basic operator, interact with a Kubernetes cluster in code, and distribute that operator to users. As you advance, you'll be able to develop a sample operator in the Go programming language using Operator SDK tools before running it locally with Operator Lifecycle Manager, and also learn how to package an operator bundle for distribution. The book covers best practices as well as sample applications and case studies based on real-world operators to help you implement the concepts you've learned.

By the end of this Kubernetes book, you'll be able to build and add application-specific operational logic to a Kubernetes cluster, making it easier to automate complex applications and augment the platform.

What you will learn

• Gain insight into the Operator Framework and the benefits of operators
• Implement standard approaches for designing an operator
• Develop an operator in a stepwise manner using the Operator SDK
• Publish operators using distribution options such as OperatorHub.io
• Deploy operators using different Operator Lifecycle Manager options
• Discover how Kubernetes development standards relate to operators
• Apply knowledge learned from the case studies of real-world operators

Who This Book Is For

This book is for engineers, developers, SREs, and cloud architects interested in automating the management of their Kubernetes clusters. This book assumes a basic understanding of core Kubernetes topics or familiarity with Kubernetes.

Table of Contents

1. Introducing the Operator Framework
2. Understanding How Operators Interact with Kubernetes
3. Designing an Operator: CRD, API, and Target Reconciliation
4. Developing an Operator with the Operator SDK
5. Developing an Operator: Advanced Functionality
6. Building and Deploying Your Kubernetes Operator
7. Packaging Operators for OperatorHub and Operator Lifecycle Manager
8. Preparing for Ongoing Maintenance of Your Operator
9. Diving into FAQs and Future Trends
10. Case Study for Optional Operator- Prometheus Operator
11. Case Study for Core Operator- Etcd Operator