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

Understanding the Istio components

Similar to a standard Kubernetes cluster, Istio refers to two separate planes, the control plane and the data plane. Historically, the data plane included 4 different services, Pilot, Galley, Citadel, and Mixer – all broken out in a true microservices design. This design was used for multiple reasons including the flexibility to break out the responsibilities to multiple teams, the ability to use different programming languages, and to scale each service independently of the others.

Istio has evolved quickly since its initial release. The team made the decision that breaking out the core services had little benefit, and in the end, made Istio more complex. This led the team to redesign Istio and starting with Istio 1.5, Istio includes the components that we will discuss in this section.

Making the Control Plane Simple with Istiod

Just as Kubernetes bundled multiple controllers into a single executable, the kube-controller-manager...