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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Installing the WordPress chart

Installing a Helm chart is a simple process that can begin with the inspection of a chart's values. In the next section, we will inspect the values that are available on the WordPress chart and describe how to create a file that allows customizing the installation. Finally, we will install the chart and access the WordPress application.

Creating a values file for configuration

You can override the values defined in charts by providing a YAML-formatted values file. In order to properly create a values file, you need to inspect the supported values that the chart provides. This can be done by running the helm show values command, as explained earlier.

Run the following command to inspect the WordPress chart's values:

$ helm show values bitnami/wordpress --version 8.1.0

The result of this command should be a long list of possible values that you can set, many of which already have default values set: