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

Understanding how Kubernetes knows who you are

There Is No Spoon

– The Matrix, 1999

In the 1999 sci-fi film The Matrix, Neo talks to a child about the Matrix as he waits to see the Oracle. The child explains to him that the trick to manipulating the Matrix is to realize that "There is no spoon".

This is a great way to look at users in Kubernetes because they don't exist. With the exception of service accounts, which we'll talk about later, there are no objects in Kubernetes called "User" or "Group". Every API interaction must include enough information to tell the API server who the user is and what groups the user is a member of. This assertion can take different forms, depending on how you plan to integrate authentication into your cluster.

In this section, we will get into the details of the different ways Kubernetes can associate a user with a cluster.

External users

Users who are accessing the Kubernetes API...