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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Chapter 6: Testing Helm Charts

Here are some answers to the questions presented in this chapter:

  1. The helm template command is used to generate your Helm templates locally. The helm lint command is used to lint for errors in your chart’s structure and chart definition file. It also attempts to find errors that will result in a failed installation.
  2. To validate your chart templates prior to installation, you can run the helm template command to generate your YAML resources locally to ensure they were generated properly. You can also use the --verify flag to check with the API server that your YAML schemas are correct without installing the resources. The helm install --dry-run command can also perform this check with the API server prior to installation.
  3. One tool that can be used to lint the style of your YAML resources is the yamllint tool. It can be used alongside helm template to lint your generated resources (for example, helm template my-test test-chart | yamllint...