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Kubernetes and Docker - An Enterprise Guide

Kubernetes and Docker - An Enterprise Guide

By : Scott Surovich, Marc Boorshtein
4.6 (13)
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Kubernetes and Docker - An Enterprise Guide

Kubernetes and Docker - An Enterprise Guide

4.6 (13)
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)
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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

Using Rego to write policies

Rego is a language specifically designed for policy writing. It is different to most languages you have likely written code in. Typical authorization code will look something like the following:

//assume failure
boolean allowed = false;
//on certain conditions allow access
if (someCondition) {
  allowed = true;
}
//are we authorized?
if (allowed) {
  doSomething();
}

Authorization code will generally default to unauthorized, with a specific condition having to happen in order to allow the final action to be authorized. Rego takes a different approach. Rego is generally written to authorize everything unless a specific set of conditions happens.

Another major difference between Rego and more general programming languages is that there are no explicit "if/then/else" control statements. When a line of Rego is going to make a decision, the code is interpreted as "if this line is false, stop execution." For instance...

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