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

Deploying a monolith

This chapter is about microservices, so why are we starting with deploying monoliths in Istio? The first answer is, because we can! There's no reason to not get the benefits of Istio's built-in capabilities when working with monoliths in your cluster. Even though it's not a "microservice" it's still good to be able to trace through application requests, manage deployments, and so on. The second answer is, because we need to. Our microservice will need to know which user in our enterprise is calling it. To do that, Istio will need a JWT to validate. We'll use our OpenUnison to generate JWTs first so we can call our service manually and then so we can authenticate users from a frontend and allow that frontend to call our service securely.

Assuming you started with a fresh cluster, we're going to deploy OpenUnison the same way we did in Chapter 5, Integration Authentication into Your Cluster, but this time we have a script...