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)
1
Section 1: Docker and Container Fundamentals
5
Section 2: Creating Kubernetes Development Clusters, Understanding objects, and Exposing Services
9
Section 3: Running Kubernetes in the Enterprise

Exposing workloads to requests

Three of the most misunderstood objects in Kubernetes are services, Ingress controllers, and load balancers. In order to expose your workloads, you need to understand how each object works and the options that are available to you. Let's look at these in detail.

Understanding how services work

As we mentioned in the introduction, any pod that is running a workload is assigned an IP address at pod startup. Many events will cause a deployment to restart a pod, and when the pod is restarted, it will likely receive a new IP address. Since the addresses that are assigned to pods may change, you should never target a pod's workload directly.

One of the most powerful features that Kubernetes offers is the ability to scale your deployments. When a deployment is scaled, Kubernetes will create additional pods to handle any additional resource requirements. Each pod will have an IP address, and as you may know, most applications only target a...