Book Image

Kubernetes and Docker - An Enterprise Guide

By : Scott Surovich, Marc Boorshtein
Book Image

Kubernetes and Docker - An Enterprise Guide

By: Scott Surovich, Marc Boorshtein

Overview of this book

Containerization has changed the DevOps game completely, with Docker and Kubernetes playing important roles in altering the flow of app creation and deployment. This book will help you acquire the knowledge and tools required to integrate Kubernetes clusters in an enterprise environment. The book begins by introducing you to Docker and Kubernetes fundamentals, including a review of basic Kubernetes objects. You’ll then get to grips with containerization and understand its core functionalities, including how to create ephemeral multinode clusters using kind. As you make progress, you’ll learn about cluster architecture, Kubernetes cluster deployment, and cluster management, and get started with application deployment. Moving on, you’ll find out how to integrate your container to a cloud platform and integrate tools including MetalLB, externalDNS, OpenID connect (OIDC), pod security policies (PSPs), Open Policy Agent (OPA), Falco, and Velero. Finally, you will discover how to deploy an entire platform to the cloud using continuous integration and continuous delivery (CI/CD). By the end of this Kubernetes book, you will have learned how to create development clusters for testing applications and Kubernetes components, and be able to secure and audit a cluster by implementing various open-source solutions including OpenUnison, OPA, Falco, Kibana, and Velero.
Table of Contents (20 chapters)
Section 1: Docker and Container Fundamentals
Section 2: Creating Kubernetes Development Clusters, Understanding objects, and Exposing Services
Section 3: Running Kubernetes in the Enterprise

Introduction to load balancers

Before discussing different types of load balancers, it's important to understand the Open Systems Interconnection (OSI) model. Understanding the different layers of the OSI model will help you to understand how different solutions handle incoming requests.

Understanding the OSI model

When you hear about different solutions to expose an application in Kubernetes, you will often here a reference to layer 7 or layer 4 load balancing. These designations refer to where each operates in the OSI model. Each layer offers different functionality; a component that runs at layer 7 offers different functionality than a component in layer 4.

To begin, let's look at a brief overview of the seven layers and a description of each. For this chapter, we are interested in the two highlighted sections, layer 4 and layer 7:

Table 6.3 OSI model layers

You don't need to be an expert in the OSI layers, but you should understand...