Book Image

The Kubernetes Workshop

By : Zachary Arnold, Sahil Dua, Wei Huang, Faisal Masood, Mélony Qin, Mohammed Abu Taleb
Book Image

The Kubernetes Workshop

By: Zachary Arnold, Sahil Dua, Wei Huang, Faisal Masood, Mélony Qin, Mohammed Abu Taleb

Overview of this book

Thanks to its extensive support for managing hundreds of containers that run cloud-native applications, Kubernetes is the most popular open source container orchestration platform that makes cluster management easy. This workshop adopts a practical approach to get you acquainted with the Kubernetes environment and its applications. Starting with an introduction to the fundamentals of Kubernetes, you’ll install and set up your Kubernetes environment. You’ll understand how to write YAML files and deploy your first simple web application container using Pod. You’ll then assign human-friendly names to Pods, explore various Kubernetes entities and functions, and discover when to use them. As you work through the chapters, this Kubernetes book will show you how you can make full-scale use of Kubernetes by applying a variety of techniques for designing components and deploying clusters. You’ll also get to grips with security policies for limiting access to certain functions inside the cluster. Toward the end of the book, you’ll get a rundown of Kubernetes advanced features for building your own controller and upgrading to a Kubernetes cluster without downtime. By the end of this workshop, you’ll be able to manage containers and run cloud-based applications efficiently using Kubernetes.
Table of Contents (20 chapters)

The Upgrade Process

In this section, you will see the steps required to upgrade the Kubernetes platform. Note that upgrading the underlying OS is not covered here. To meet the requirement of zero-downtime upgrades, you must have an HA Kubernetes cluster with a minimum of three masters and etcd servers, which enables frictionless upgrades. The process will take one node out of the three and upgrade it. The upgraded component then will rejoin the cluster, and then we take the second node and apply the upgrade process to it. Since, at any given time, at least two of the servers are kept available, the cluster will remain available during the upgrade.

Some Considerations for kops

We have guided you through the creation of an HA Kubernetes cluster in Chapter 11, Build Your Own HA Cluster. Hence, in this chapter, we will walk you through upgrading the same cluster.

As mentioned in that chapter, there are various ways of deploying and managing a Kubernetes cluster. We have opted...