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

Kubernetes RBAC

Kubernetes RBAC aims to regulate access to Kubernetes resources according to the roles with specific permissions to perform a specific task.

Once specified, RBAC checks the rbac.authorization.k8s.io API group membership to see whether it is allowed through the Kubernetes API.

Let’s take a look at the different Roles and RoleBindings in Kubernetes.

Roles versus ClusterRoles and their RoleBindings

In Kubernetes, we have Roles and ClusterRoles. A Kubernetes RBAC Role or ClusterRole represents a role with a set of permissions. In a nutshell, they differ by the scope of these permissions:

  • A Role represents permissions within a particular namespace
  • A ClusterRole represents permissions within the cluster – it could be cluster-wide, across multiple namespaces, or individual namespaces

With Roles and ClusterRoles, we have the concept of RoleBinding and ClusterRoleBinding. The bindings bind the role to a list of subjects such as...