Book Image

kubectl: Command-Line Kubernetes in a Nutshell

By : Rimantas Mocevicius
Book Image

kubectl: Command-Line Kubernetes in a Nutshell

By: Rimantas Mocevicius

Overview of this book

The kubectl command line tool lets you control Kubernetes clusters to manage nodes in the cluster and perform all types of Kubernetes operations. This introductory guide will get you up to speed with kubectl in no time. The book is divided into four parts, touching base on the installation and providing a general overview of kubectl in the first part. The second part introduces you to managing Kubernetes clusters and working with nodes. In the third part, you’ll be taken through the different ways in which you can manage Kubernetes applications, covering how to create, update, delete, view, and debug applications. The last part of the book focuses on various Kubernetes plugins and commands. You’ll get to grips with using Kustomize and discover Helm, a Kubernetes package manager. In addition to this, you’ll explore how you can use equivalent Docker commands in kubectl. By the end of this book, you’ll have learned how to install and update an application on Kubernetes, view its logs, and inspect clusters effectively.
Table of Contents (16 chapters)
Section 1: Getting Started with kubectl
Section 2: Kubernetes Cluster and Node Management
Section 3: Application Management
Section 4: Extending kubectl

Chapter 4: Creating and Deploying Applications

In the previous chapters, we have learned about Kubernetes nodes. Let's finally deploy an application using a Kubernetes deployment, scale the application up, and create a service for it.

A Kubernetes deployment is one way to deploy applications from Docker images, and we are going to use it for our example applications.

Kubernetes supports a few container runtimes, all of which can run Docker images:

  • Docker
  • CRI-O
  • Containerd

In this chapter, we're going to cover the following topics:

  • Introduction to pods
  • Creating a deployment
  • Creating a service
  • Scaling up an application