Book Image

The Kubernetes Workshop

By : Zachary Arnold, Sahil Dua, Wei Huang, Faisal Masood, Mélony Qin, Mohammed Abu Taleb
Book Image

The Kubernetes Workshop

By: Zachary Arnold, Sahil Dua, Wei Huang, Faisal Masood, Mélony Qin, Mohammed Abu Taleb

Overview of this book

Thanks to its extensive support for managing hundreds of containers that run cloud-native applications, Kubernetes is the most popular open source container orchestration platform that makes cluster management easy. This workshop adopts a practical approach to get you acquainted with the Kubernetes environment and its applications. Starting with an introduction to the fundamentals of Kubernetes, you’ll install and set up your Kubernetes environment. You’ll understand how to write YAML files and deploy your first simple web application container using Pod. You’ll then assign human-friendly names to Pods, explore various Kubernetes entities and functions, and discover when to use them. As you work through the chapters, this Kubernetes book will show you how you can make full-scale use of Kubernetes by applying a variety of techniques for designing components and deploying clusters. You’ll also get to grips with security policies for limiting access to certain functions inside the cluster. Toward the end of the book, you’ll get a rundown of Kubernetes advanced features for building your own controller and upgrading to a Kubernetes cluster without downtime. By the end of this workshop, you’ll be able to manage containers and run cloud-based applications efficiently using Kubernetes.
Table of Contents (20 chapters)
Preface

PodSecurityPolicy

So far, we have learned about and tested Kubernetes RBAC to prevent unauthorized API server access, and also applied a NetworkPolicy to prevent unnecessary network communication. The next most important area of security outside the network is the application runtime. Attackers need access to the network to get in and out, but they also need a vulnerable runtime to do anything more serious. This is where Kubernetes PodSecurityPolicy objects help prevent that from happening.

PodSecurityPolicy objects overlap with a specific type of AdmissionController and allow a cluster operator to dynamically define the minimum runtime requirements of a Pod that's been admitted for scheduling on the cluster.

To understand exactly how PodSecurityPolicies can be useful, let's consider the following scenario. You are a Kubernetes cluster admin at a large financial institution. Your company uses ticket-based change management software in an ITIL-compliant fashion (ITIL...