Book Image

Certified Kubernetes Administrator (CKA) Exam Guide

By : Mélony Qin
4 (1)
Book Image

Certified Kubernetes Administrator (CKA) Exam Guide

4 (1)
By: Mélony Qin

Overview of this book

Kubernetes is the most popular container orchestration tool in the industry. The Kubernetes Administrator certification will help you establish your credibility and enable you to efficiently support the business growth of individual organizations with the help of this open source platform. The book begins by introducing you to Kubernetes architecture and the core concepts of Kubernetes. You'll then get to grips with the main Kubernetes API primitives, before diving into cluster installation, configuration, and management. Moving ahead, you’ll explore different approaches while maintaining the Kubernetes cluster, perform upgrades for the Kubernetes cluster, as well as backup and restore etcd. As you advance, you'll deploy and manage workloads on Kubernetes and work with storage for Kubernetes stateful workloads with the help of practical scenarios. You'll also delve into managing the security of Kubernetes applications and understand how different components in Kubernetes communicate with each other and with other applications. The concluding chapters will show you how to troubleshoot cluster- and application-level logging and monitoring, cluster components, and applications in Kubernetes. By the end of this Kubernetes book, you'll be fully prepared to pass the CKA exam and gain practical knowledge that can be applied in your day-to-day work.
Table of Contents (17 chapters)
1
Part 1: Cluster Architecture, Installation, and Configuration
5
Part 2: Managing Kubernetes
10
Part 3: Troubleshooting

Upgrading a Kubernetes cluster using kubeadm

Kubernetes versions follow semantic versioning, and are expressed in three parts:

  1. Major version
  2. Minor version
  3. Patch version

For example, Kubernetes version 1.23.3 means that it is Kubernetes 1.23 minor version with patch number 3. Similarly, 1.22 and 1.21 are both minor versions like 1.23.

At the time of writing this book, Kubernetes 1.19+ has one year of path support. That means for Kubernetes 1.23, released in January 2022, the end of support will be February 2023. For Kubernetes 1.8 and older, the support patch was shortened to roughly 9 months instead. Special interest group (SIG) releases manage the Kubernetes release cycle, and the best way to keep track of the release schedule is to follow them at https://github.com/kubernetes/sig-release/tree/master/releases and read the change log at https://github.com/kubernetes/kubernetes/tree/master/CHANGELOG to keep up to date.

If you would like to upgrade a cluster...