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

Do I need an API gateway?

If you're using Istio, do you still need an API gateway? In the past, Istio has been primarily concerned with routing traffic for services. It got traffic into the cluster and figured out where to route it to. API gateways have more typically been focused on application-level functionality such as authentication, authorization, input validation, and logging.

For example, earlier in this chapter we identified schema input validation as a process that needs to be repeated for each call and shouldn't need to be done manually. This is important to protect against attacks that can leverage unexpected input and also makes for a better developer experience to provide feedback to developers sooner in the integration process. This is a common function for API gateways, but is not available in Istio.

Another example of a function that is not built into Istio, but is common for API gateways, is logging authentication and authorization decisions and...