Book Image

Kubernetes – An Enterprise Guide - Second Edition

By : Marc Boorshtein, Scott Surovich
Book Image

Kubernetes – An Enterprise Guide - Second Edition

By: Marc Boorshtein, Scott Surovich

Overview of this book

Kubernetes has taken the world by storm, becoming the standard infrastructure for DevOps teams to develop, test, and run applications. With significant updates in each chapter, this revised edition will help you acquire the knowledge and tools required to integrate Kubernetes clusters in an enterprise environment. The book introduces you to Docker and Kubernetes fundamentals, including a review of basic Kubernetes objects. You’ll get to grips with containerization and understand its core functionalities such as creating ephemeral multinode clusters using KinD. The book has replaced PodSecurityPolicies (PSP) with OPA/Gatekeeper for PSP-like enforcement. You’ll integrate your container into a cloud platform and tools including MetalLB, externalDNS, OpenID connect (OIDC), Open Policy Agent (OPA), Falco, and Velero. After learning to deploy your core cluster, you’ll learn how to deploy Istio and how to deploy both monolithic applications and microservices into your service mesh. Finally, you will discover how to deploy an entire GitOps platform to Kubernetes using continuous integration and continuous delivery (CI/CD).
Table of Contents (17 chapters)
15
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16
Index

What's a Role?

In Kubernetes, a Role is a way to tie together permissions into an object that can be described and configured.

Roles have rules, which are a collection of resources and verbs. Working backward, we have the following:

  • Verbs: The actions that can be taken on an API, such as reading (get), writing (create, update, patch, and delete), or listing and watching.
  • Resources: Names of APIs to apply the verbs to, such as services, endpoints, and so on. Specific sub-resources may be listed as well. Specific resources can be named to provide very specific permissions on an object.

A Role does not say who can perform the verbs on the resources—that is handled by RoleBindings and ClusterRoleBindings. We will learn more about these in the RoleBindings and ClusterRoleBindings section.

The term "role" can have multiple meanings, and RBAC is often used in other contexts. In the enterprise world, the term "role&quot...