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 4: Understanding Helm Charts

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

  1. YAML is the format most commonly used, though JSON can be used alternatively.
  2. The three required fields are apiVersion, name, and version.
  3. Values from a chart dependency can be referenced or overridden by placing desired dependency values in a map whose name is equal to the name of the dependency chart. Values can also be imported using the import-values setting, which can be used to allow dependency values to be referenced using a different name.
  4. You can create an upgrade hook to ensure that a data snapshot is taken before running the helm upgrade command.
  5. You can provide the file to provide documentation for your chart. You can also create the templates/NOTES.txt file, which can dynamically generate release notes upon installation. Finally, the LICENSE file can be used to provide legal information.
  6. The range action allows chart developers to...