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

Creating a Helm chart

We have learned many cool tricks we can do with Helm! Let's now learn how to create a Helm chart.

The helm create command creates an example chart for you, so you can use it as a base and update it with the required Kubernetes resources, values, and so on. It creates a fully working nginx chart, so we are going to name the chart by that name.

Let's now check how easy it is to create a chart by running the following command:

$ helm create nginx

The output of the preceding command is shown in the following screenshot:

Figure 9.15 – The helm create command

In the preceding screenshot, we ran the helm create nginx command, where nginx is our chart name. The name is also used to create a new folder where the chart content will be stored. The folder structure is shown using the tree nginx command.

As you can see in the screenshot, the deployment.yaml file, Horizontal Pod Autoscaler (HPA), ingress, service, and...