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

Summary

The Kubernetes Scheduler is a powerful software that abstracts the work of selecting the appropriate node for a Pod on a cluster. The Scheduler watches for unscheduled Pods and attempts to find suitable nodes for them. Once it finds a suitable node for a Pod, it updates etcd (via the API server) that the Pod has been bound to the node.

The scheduler has matured with every release of Kubernetes. The default behavior of the scheduler is sufficient for a variety of workloads, although you have also seen many ways to customize the way that the Scheduler associates resources with Pods. You have seen how node affinity can help you schedule Pods on your desired nodes. Pod affinity can help you schedule a Pod relative to another Pod, and it is a good tool for applications where multiple modules are targeted to be placed next to each other. Taints and tolerations can also help you assign specific workloads to specific nodes. You have also seen that Pod priority can help you schedule...