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

Understanding the Chart.yaml file

The Chart.yaml file, also referred to as the chart definition, is used for storing different pieces of metadata about a Helm chart. This file is required, and if it is not included within a chart, you’ll receive the following error:

Error: Chart.yaml file is missing

A Chart.yaml file was created for you earlier when you ran helm create. Let’s review this file by running the following command:

$ cat guestbook/Chart.yaml

An output like the following will be displayed:

Figure 4.4 – The Guestbook Chart.yaml file

A Chart.yaml file can contain many different fields, some of which are required, while most other fields are optional. Let’s take a closer look at each of the fields provided in our Guestbook chart’s Chart.yaml file.