Book Image

The Kubernetes Book

By : Nigel Poulton, Pushkar Joglekar
Book Image

The Kubernetes Book

By: Nigel Poulton, Pushkar Joglekar

Overview of this book

Kubernetes is the leading orchestrator of cloud-native apps. With knowledge of how to work with Kubernetes, you can easily deploy and manage applications on the cloud or in your on-premises data center. The book begins by introducing you to Kubernetes and showing you how to install it. You’ll learn how to use Kubernetes Services and bring stable and reliable networking to apps that are deployed on Kubernetes. You'll delve deep into the powerful storage subsystem of Kubernetes and learn how to leverage the variety of external storage backends in your applications. As the book progresses, it shows you how to use features such as DaemonSets, Helm, and RBAC to enhance your Kubernetes applications. You'll explore the six categories of identifying vulnerabilities and look at a few ways to prevent and mitigate them. You'll also look at ways to secure the software delivery pipeline by discussing some image-related best practices. The book ends by sharing with you some resources that’ll help take your Kubernetes knowledge to the next level. By the end of the book, you’ll have the confidence and skills to leverage all the features of Kubernetes to develop scalable applications.
Table of Contents (23 chapters)
Free Chapter
1
Chapter 1
3
Chapter 2
5
Chapter 3
7
Chapter 4
9
Chapter 5
11
Chapter 6
13
Chapter 7
15
Chapter 8
17
Chapter 9
19
Chapter 10
21
Chapter 11

Role-Based Access Control (RBAC)

Kubernetes implements a least-privilege RBAC subsystem. When enabled, it locks down a cluster and allows you to grant permissions based on specific users and groups.

The model is based on three major components:

  • Subjects
  • Operations
  • Resources

Subjects are users and groups, and these must be managed outside of Kubernetes. Operations are what the subject is allowed to do (create, list, or delete). Resources are objects on the cluster such as Pods. Put the three together, and you have an RBAC rule. For example, Abi (subject) is allowed to create (operation) Pods (resource).

RBAC has been stable (v1) since Kubernetes 1.8 and leverages two objects that are defined in the authorization.rbac.k8s.io API group. The two objects are Roles and RoleBindings. The Role object is where you define the resource and the operation that you want to allow, and the RoleBinding object connects it with a subject.