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)

Upgrading Kubernetes Master Components

When you are running Kubernetes in any capacity that is important for your organization, you will be running the platform in an HA configuration. To achieve that, the typical configuration is at least three replicas of master components, running on three different nodes. This allows you to upgrade single nodes from one minor version to the next, one by one, while still maintaining API compatibility when an upgraded node rejoins the cluster because Kubernetes provides compatibility across one minor version. This means the master components can be on different versions when you are upgrading each node at a time. The following table provides a logical flow of the versions. Let's assume you are upgrading from version 1.14 to 1.15:

Figure 18.14: Upgrade plan for three master nodes

In the following exercise, we will proceed with upgrading the Kubernetes master components.

Exercise 18.03: Upgrading Kubernetes Master...