Jason Dobies - Kubernetes Operators
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- Book:Kubernetes Operators
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Kubernetes has emerged as the worlds most powerful container orchestration platform, but its true power is hidden behind an extensible API and automation framework that will redefine how future platforms are built and operated; this book is the missing manual.
Kelsey Hightower, Technologist, Google Cloud
The Kubernetes Operators book by Jason and Josh is something that should not be missing on your (digital) bookshelf, if youre serious about Kubernetes. Its hands-on, covers the why and the how, and enables you to successfully apply the operator pattern in your environment. Id consider this book the perfect followup to Programming Kubernetes.
Michael Hausenblas, Amazon Web Services
This book is essential for anyone looking to adopt the Operator Paradigm for their critical workloads. It provides a comprehensive overview of design principles, implementation paths and traps, and utilization of the existing ecosystem.
Anish Asthana, Software Engineer, Red Hat
Working with Jason over the past several years, I have always wanted a dump of whats in his head, and now I have it! Josh and Jason have created an essential guide for anyone creating operators, and it will be a significant advantage for us as we look to mature our operator into the Auto Pilot phase with the goal of becoming a true Kubernetes Application Reliability Engineering function for our customers.
Dave Meurer, Technical Global Alliances, Synopsys, Inc.
Another brilliant publication by Josh and Jason that provides market-leading data for Kubernetes Operators.
Joe Gomes, Global Alliances, Synopsys, Inc.
by Jason Dobies and Joshua Wood
Copyright 2020 Red Hat, Inc. All rights reserved.
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- March 2020: First Edition
- 2020-01-13: First Release
- 2020-02-21: Second Release
See http://oreilly.com/catalog/errata.csp?isbn=9781492048046 for release details.
The OReilly logo is a registered trademark of OReilly Media, Inc. Kubernetes Operators, the cover image, and related trade dress are trademarks of OReilly Media, Inc.
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978-1-492-04804-6
[LSI]
To my kids, Leanne and Austin, know that it is never easy to have to tell you No, daddy has to work. Realize that all of itthe meetings, the trips, the bookall of it is for you two. I have your backs in whatever the future holds for you, and I cant wait to see the awesome things you two do.
Jason
To Shayna.
Joshua
Kubernetes is a popular container orchestrator. It harnesses many computers together into one large computing resource and establishes a means of addressing that resource through the Kubernetes application programming interface (API). Kubernetes is open source software with origins at Google, developed over the last five years by a large group of collaborators under the auspices of the Cloud Native Computing Foundation (CNCF).
An Operator extends Kubernetes to automate the management of the entire lifecycle of a particular application. Operators serve as a packaging mechanism for distributing applications on Kubernetes, and they monitor, maintain, recover, and upgrade the software they deploy.
If youve deployed applications on a Kubernetes cluster, youll be familiar with some of the challenges and aspirations that forged the Operator pattern. If youve maintained foundation services like databases and filesystems in their own ghetto outside your orchestrated clusters, and you yearn to bring them into the neighborhood, this guide to Kubernetes Operators is for you.
This book explains what an Operator is and how Operators extend the Kubernetes API. It shows how to deploy and use existing Operators, and how to create and distribute Operators for your applications using the Red Hat Operator Framework. We relate good practices for designing, building, and distributing Operators, and we explain the thinking that animates Operators with Site Reliability Engineering (SRE) principles.
After describing Operators and their concepts in the first chapter, well suggest ways to get access to a Kubernetes cluster where you can do the exercises in the rest of the book. With a cluster running, youll deploy an Operator and observe its behavior when its application fails, scales, or gets upgraded to a new version.
Later, we will explore the Operator SDK and show you how to use it to build an Operator to naturalize an example application as a first-class Kubernetes citizen. With that practical foundation in place, we will discuss the SRE ideas from which Operators derive and the goals they share: reducing operations effort and cost, increasing service reliability, and spurring innovation by freeing teams from repetitive maintenance work.
The Operator pattern emerged at CoreOS as a way to automate increasingly complex applications on Kubernetes clusters, including managing Kubernetes itself and the etcd key-value store at its heart. Work on Operators continued through an acquisition by Red Hat, leading to the 2018 release of the open source Operator Framework and SDK. The examples in this book use the Red Hat Operator SDK and the distribution mechanisms that join it in the Operator Framework.
A community has grown up around Operators, with more than a hundred Operators for an array of applications from many vendors and projects available in Red Hats distribution channels alone. Several other Operator construction tools exist. We wont discuss them in detail, but after you read this book youll be able to compare any of them with the Operator SDK and Framework. Other open source tools available for building Operators include Kopf for Python, Kubebuilder from the Kubernetes project, and the Java Operator SDK.
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