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

Pod Priority

Kubernetes allows you to associate a priority with a Pod. If there are resource constraints, if a new Pod with high priority is requested to be scheduled, the Kubernetes scheduler may evict the Pods with lower priority in order to make room for the new high-priority Pod.

Consider an example where you are a cluster administrator and you run both critical and non-critical workloads in the cluster. An example is a Kubernetes cluster for a bank. In this case, you would have a payment service as well as the bank's website. You may decide that processing payments are of higher importance than running the website. By configuring Pod priority, you can prevent lower-priority workloads from impacting critical workloads in your cluster, especially in cases where the cluster starts to reach its resource capacity. This technique of evicting lower-priority Pods to schedule more critical Pods could be faster than adding additional nodes and would help you better manage traffic...