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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In this chapter, you learned about the different methods you can apply to test your Helm charts. The most basic way of testing a chart is to run the helm template command against a local chart directory to determine whether its resources are properly generated. You can also use the helm lint command to ensure that your chart follows the correct format and you can use the yamllint command to lint the YAML style used in your chart.

Apart from local templating and linting, you can also perform live tests on a Kubernetes environment with the helm test command and the ct tool. In addition to performing chart tests, chart testing also provides capabilities that make it easier for chart developers to maintain Helm charts in a monorepo.

In the next chapter, you will learn how Helm can be used in a Continuous Integration/Continuous Delivery (CI/CD) and GitOps setting, from both the perspective of a chart developer that is building and testing Helm charts and from the perspective...