Nigel Poulton - The Kubernetes Book
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- Book:The Kubernetes Book
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- Year:2021
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This book is for sale at http://leanpub.com/thekubernetesbook
This version was published on 2021-04-21
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This is a Leanpub book. Leanpub empowers authors and publishers with the Lean Publishing process. Lean Publishing is the act of publishing an in-progress ebook using lightweight tools and many iterations to get reader feedback, pivot until you have the right book and build traction once you do.
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Education is about inspiring and creating opportunities. I hope this book, and my video training courses, inspire you and create lots of opportunities!
A huge thanks to my family for putting up with me. Im a geek who thinks hes software running on midrange biological hardware. I know its not easy living with me.
Thanks to everyone who watches my Pluralsight and A Cloud Guru training videos. I love connecting with you and appreciate all the feedback Ive had over the years. This feedback is what inspired me to write this book. I think youll love it, and I hope it helps drive your career forward.
@nigelpoulton
Kubernetes is developing fast. With this in mind, Im fully committed to updating this book every year. And when I say update, I mean real updates every word and every concept will be reviewed, and every example will be tested and updated against the latest version of Kubernetes. Make no mistake, Im 100% committed to making this the best Kubernetes book in the world.
If an update every year seems like a lot welcome to the new normal.
We no longer live in a world where a 2-year-old book on Kubernetes is valuable. Dont get me wrong, as an author, Id love to write a book that was valuable for 5 years. Its just not the world we live in anymore. Again, welcome to the new normal.
At the time of writing, theres an English language paperback in every Amazon market that supports the Amazon self-publishing platform (KDP).
The following additional paperbacks are also available (or will be very shortly):
- Indian sub-continent version via Shroff Publishers and Amazon.in
- Simplified Chinese via Posts & Telecom Press Co. LTD in China and Amazon.cn
- Large-print paperback for anyone who finds it easier to read larger print
eBook copies are available from leanpub.com, Amazon Kindle, and several other subscription-based platforms.
The following editions are currently being created and will be released as soon as possible via as many markets as possible.
- Spanish translation
- Russian translation
- English hardback
Theres also a high quality audio version of the March 2019 edition on Audible. I did a bit of tweaking to make it easier to listen to, and feedback has been all positive.
Finally, theres a Klingon edition of the book, and a Borg edition. Yes, you read that right.
The Klingon edition has a special front-cover with the book title and YAML extract in Klingon font. The Borg edition is the same, just in Borg font. For both editions, the actual content of the book is in English. Think of them as collectors editions for Star Trek fans.
The book has a GitHub repo with all the YAML code and examples used throughout the book.
You dont have to, but Its recommended to clone the repo locally (thats jargon for copying it to your computer). Youll need to install git and then run the following command.
This creates a new folder in your current working directory called TheK8sBook with all the files you need to follow the examples.
If you like the book, Id be stoked if you gave it a review and a few stars on Amazon. No pressure though, were all busy.
You can reach me on any of the following:
- twitter.com/nigelpoulton
- nigelpoulton.com
- linkedin.com/in/nigelpoulton
- youtube.com/nigelpoulton
If you want to submit a content suggestion, or a potential fix, drop me an email at tkb@nigelpoulton.com. Ill do my best to respond.
Enjoy the book!
This chapter is split into two main sections.
- Kubernetes background where it came from etc.
- Kubernetes as the Operating System of the cloud
Kubernetes is an application orchestrator. For the most part, it orchestrates containerized cloud-native microservices apps. How about that for a sentence full of buzzwords!
Youll come across terms like this a lot, so lets take a minute to explain what each of them means.
An orchestrator is a system that deploys and manages applications. It can deploy your applications and dynamically respond to changes. For example, Kubernetes can:
- Deploy your application
- Scale it up and down dynamically based on demand
- Self-heal it when things break
- Perform zero-downtime rolling updates and rollbacks
- Lots more
And the best part about Kubernetes it does all of this without you having to supervise or get involved. Obviously, you have to set things up in the first place, but once youve done that, you sit back and let Kubernetes work its magic.
A containerized application is an app that runs in a container.
Before we had containers, applications ran on physical servers or in virtual machines. Containers are just the next iteration of how we package and run apps. As such, theyre faster, more lightweight, and more suited to modern business requirements than servers and virtual machines.
Think of it this way.
- Apps ran on physical servers in the open-systems era (1980s and 1990s)
- Apps ran in virtual machines in the virtualisation era (2000s and into the 2010s)
- Apps run in containers in the cloud-native era (now)
While Kubernetes can orchestrate other workloads, such as virtual machines and serverless functions, its most commonly used to orchestrate containerised apps.
A cloud-native application is one thats designed to meet cloud-like demands of auto-scaling, self-healing, rolling updates, rollbacks and more.
Its important to be clear that cloud-native apps are not applications that will only run in the public cloud. Yes, they absolutely can run on public clouds, but they can also run anywhere that you have Kubernetes, even your on-premises datacenter.
So, cloud-native is about the way applications behave and react to events.
A microservices app is built from lots of independent small specialised parts that work together to form a meaningful application. For example, you might have an e-commerce app that comprises all of the following small specialised components:
- Web front-end
- Catalog service
- Shopping cart
- Authentication service
- Logging service
- Persistent store
Each of these individual services is called a
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