Book Image

Learn Helm

By : Andrew Block, Austin Dewey
Book Image

Learn Helm

By: Andrew Block, Austin Dewey

Overview of this book

Containerization is currently known to be one of the best ways to implement DevOps. While Docker introduced containers and changed the DevOps era, Google developed an extensive container orchestration system, Kubernetes, which is now considered the frontrunner in container orchestration. With the help of this book, you’ll explore the efficiency of managing applications running on Kubernetes using Helm. Starting with a short introduction to Helm and how it can benefit the entire container environment, you’ll then delve into the architectural aspects, in addition to learning about Helm charts and its use cases. You’ll understand how to write Helm charts in order to automate application deployment on Kubernetes. Focused on providing enterprise-ready patterns relating to Helm and automation, the book covers best practices for application development, delivery, and lifecycle management with Helm. By the end of this Kubernetes book, you will have learned how to leverage Helm to develop an enterprise pattern for application delivery.
Table of Contents (15 chapters)
Section 1: Introduction and Setup
Section 2: Helm Chart Development
Section 3: Adanced Deployment Patterns
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Testing in a live cluster

Creating chart tests is an important part of developing and maintaining your Helm charts. Chart tests help verify that your chart is functioning as intended and they can help prevent regressions as features and fixes to your chart are added.

Testing consists of two different steps. First, you need to create pod templates under your chart's templates/ directory that contain the test annotation. These pods will run commands that test the functionality of your chart and application. Next, you need to run the helm test command, which initiates a test hook and creates resources with the aforementioned annotation.

In this section, we will learn how to test in a live cluster by adding tests to the Guestbook chart, continuing the development of the chart you created in the previous chapter. As a reference, the tests that you will create can be viewed in the Guestbook chart in the Packt repository, located at