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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

Configuring Impersonation without OpenUnison

The OpenUnison operator automated a couple of key steps to get impersonation working. There are other projects designed specifically for Kubernetes, such as JetStack's OIDC Proxy (https://github.com/jetstack/kube-oidc-proxy), that are designed to make using impersonation easier. You can use any reverse proxy that can generate the correct headers. There are two critical items to understand when doing this on your own.

Impersonation RBAC policies

RBAC will be covered in the next chapter, but for now, the correct policy to authorize a service account for impersonation is as follows:

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: impersonator
rules:
- apiGroups:
  - ""
  resources:
  - users
  - groups
  verbs:
  - impersonate

To constrain what accounts can be impersonated, add resourceNames to your rule.

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