Book Image

Managing Kubernetes Resources Using Helm - Second Edition

By : Andrew Block, Austin Dewey
Book Image

Managing Kubernetes Resources Using Helm - Second Edition

By: Andrew Block, Austin Dewey

Overview of this book

Containerization is one of the best ways to implement DevOps, and learning how to execute it effectively is an essential part of a developer’s skillset. Kubernetes is the current industry standard for container orchestration. This book will help you discover the efficiency of managing applications running on Kubernetes with Helm. Starting with a brief introduction to Helm and its impact on users working with containers and Kubernetes, you’ll delve into the primitives of Helm charts and their architecture and use cases. From there, you’ll understand how to write Helm charts in order to automate application deployment on Kubernetes and work your way toward more advanced strategies. These enterprise-ready patterns are focused on concepts beyond the basics so that you can use Helm optimally, looking at topics related to automation, application development, delivery, lifecycle management, and security. By the end of this book, you’ll have learned how to leverage Helm to build, deploy, and manage applications on Kubernetes.
Table of Contents (18 chapters)
1
Part 1: Introduction and Setup
5
Part 2: Helm Chart Development
12
Part 3: Advanced Deployment Patterns

Installing a WordPress chart

Installing a Helm chart is a simple process that should begin with inspecting a chart’s values. In the next section, we will inspect the values that are available in the WordPress chart and describe how to create a file that allows for 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. To 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 12.1.6

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:

Figure 3.9 – A...