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

Summary

In this three-part chapter, you learned about exposing your workloads in Kubernetes to other cluster resources and users.

The first part of the chapter went over services and the multiple types that can be assigned. The three major service types are ClusterIP, NodePort, and LoadBalancer. Remember that the selection of the type of service will configure how your application is exposed.

In the second part, we introduced two load balancer types, layer 4 and layer 7, each having a unique functionality for exposing workloads. Typically, services alone are not the only objects that are used to provide access to applications running in the cluster. You will often use a ClusterIP service along with an Ingress controller to provide access to services that use layer 7. Some applications may require additional communication, which is not provided by a layer 7 load balancer. These applications may require a layer 4 load balancer to expose their services to users. In the load balancing...