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

Enforcing Pod Security Policies using OPA

In Chapter 10, Creating Pod Security Policies, we discussed the fact that the existing Pod security policy implementation for Kubernetes would never become "GA". One of the alternatives to using the Kubernetes implementation was to use OPA and GateKeeper to enforce the same policies, but in OPA instead of on the API server. This process works differently to the standard implemented by Kubernetes, but using it can keep your clusters more vendor-independent and less susceptible to the changes that will eventually arise with whatever comes next for Kubernetes' Pod security policies.

GateKeeper's policies are all published at https://github.com/open-policy-agent/gatekeeper/tree/master/library/pod-security-policy. They're built as a series of ConstraintTemplate objects and example constraints. This approach to Pod security policies makes for some specific differences in how policies are implemented.

The first major...