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)
Part 1: Introduction and Setup
Part 2: Helm Chart Development
Part 3: Advanced Deployment Patterns

Updating the Guestbook Chart.yaml file

The scaffolded Chart.yaml file that helm create generated is catered around NGINX and not Guestbook as we would desire. Let’s make a couple of quick changes to improve the content:

  1. First, let’s update the chart description to better describe the application our chart will deploy. Update the description field of Chart.yaml to the following (or feel free to provide your own):
    description: An application used for keeping a running record of guests
  2. Next, let’s provide a more appropriate appVersion setting that better suits the version of Guestbook that our chart will deploy. The latest version of Guestbook is v5, so let’s use this as our appVersion:
    appVersion: v5

Our Chart.yaml file should now look like this (with the comments removed):

Figure 4.8 – The updated Chart.yaml file for Guestbook

Feel free to add any of the other Chart.yaml fields as well, but these changes, at...