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

Populating Deployments in Kubernetes

As we mentioned earlier, Deployment is a convenient way to manage and update pods. Defining a Deployment in Kubernetes is an effective and efficient way to provide declarative updates for the application running in your cluster.

You can create a Deployment by using kubectl imperative commands or by using declarative YAML manifest files. In the following exercise, we're going to deploy an application (we will go with Nginx for this exercise) in Kubernetes and learn how to interact with Deployments using kubectl commands, as well as how to modify the YAML manifest file.

Exercise 3.02: Creating a Deployment

There are two ways to create a Deployment in Kubernetes – using the kubectl create/run command and creating a manifest file in YAML format and then using the kubectl apply command. We can achieve the same goal with those two options. Let's try both and then compare them:

  1. Create a Deployment using the following command...