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

Chapter 6

  1. Correct answer: (D) By the selector label. When you create a service object, you include a selector that includes the label to match for the service endpoints. Any matching pods will be added as an endpoint.
  2. Correct answer: (B) kubectl get ep <service name>. Services use endpoints to select the pods that receive requests to the service. One of the first steps when it comes to troubleshooting a service is to verify that endpoints have been assigned.
  3. Correct answer: (B) False. Some distributions do include support for LoadBalancer services out of the box, but most still do not include support without the need to add a component such as MetalLB.
  4. Correct answer: (D) Layer 4. The two load balancers used in Kubernetes are Layer 7 and Layer 4. Layer 7 load balancers run in Layer 7 of the OSI model and can only accept application-level traffic such as HTTP and HTTPS. Since Layer 4 load balancers run at a lower layer of the OSI model, they have access to lower...