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

Cracking stateful applications in Kubernetes

In this section, we will learn about how to work with storage for stateful applications in Kubernetes. The considerations within this part are often seen as high-value and low-effort in terms of the CKA exam. Make sure you keep practicing them until you feel you know them confidently:

  • Mounting storage to a stateful application
  • Dynamically provisioning storage to a stateful application

Configuring an application with mounted storage

You need to create a new YAML definition where you write up the specification of the Kubernetes pod and then set up emptyDir volumes for the pod. Kubernetes creates empty storage on a node after the pod is scheduled to a specific worker node:

  1. Check whether you currently have any nodes available to schedule a pod by using the following command:
    kubectl get nodes

Alternatively, you can use the simplified version of the previous command:

alias k=kubectl
k get no

If the...