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

Using audit2rbac to debug policies

There is a tool called audit2rbac that can reverse engineer errors in the audit log into RBAC policy objects. In this section, we'll use this tool to generate an RBAC policy after discovering that one of our users can't perform an action they need to be able to do. This is a typical RBAC debugging process and learning how to use this tool can save you hours trying to isolate RBAC issues:

  1. In the previous chapter, a generic RBAC policy was created to allow all members of the cn=k8s-cluster-admins,ou=Groups,DC=domain,DC=com group to be administrators in our cluster. If you're logged into OpenUnison, log out.
  2. Now, log in again with the username jjackson and the password start123.
  3. Next, click on Sign In. Once you're logged in, go to the dashboard. Just as when OpenUnison was first deployed, there won't be any namespaces or other information because the RBAC policy for cluster administrators doesn't...