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

What is a PodSecurityPolicy?

A PSP is a Kubernetes resource that allows you to set security controls for your workloads, allowing you to set limitations on what a pod can do. PSPs are evaluated before a pod is allowed to start up and if the pod attempts to do something that a PSP forbids, it will not be allowed to start.

Many people have experience with physical and virtual servers, and most know how to secure workloads running on them. Containers need to be considered differently when you talk about securing each workload. To understand why PSPs and other Kubernetes security tools such as the Open Policy Agent (OPA) exist, you need to understand how a container is different from a virtual machine (VM).

Understanding the difference between containers and VMs

"A container is a lightweight VM" is often how containers are described to those new to containers and Kubernetes. While this makes for a simple analogy, from a security standpoint, it's a dangerous comparison...