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

Chapter 2

  1. Correct answers: (B) Bind mounts and (C) Volumes. Only a Docker volume and bind mount provide persistency to a container. tmpfs volumes are stored in RAM and are not written to disk.
  2. Correct answer: (A) True. A volume must be created before it can be used in a container. If a volume is not created before running a container, Docker will create the volume before mounting it to the container.
  3. Correct answer: (D) 32 GB. If a tmpfs size is not specified, Docker will create a volume that is equal to half of the host's RAM.
  4. Correct answer: (B) False. Stopping or removing an image will not remove a persistent volume by default. To delete a volume, you can add the -v option to the docker rm command, or you can use the docker volume rm command to remove the volume manually.
  5. Correct answer: (B) Named volumes. Only anonymous and named volumes are managed by the Docker daemon.
  6. Correct answer: (D) You must manually delete the Bind folder. Since Bind mounts...