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 YAML format

YAML Ain’t Markup Language (YAML) is a file format used to create human-readable configuration. It is the file format most used to configure Kubernetes resources and is also the format used for many of the files in Helm charts.

YAML files follow a key-value format to declare configuration. Let’s explore the YAML key-value construct.

Defining key-value pairs

One of the most basic examples of a YAML key-value pair is shown here:

name: LearnHelm

In the preceding example, the name key is given a LearnHelm value. In YAML, keys and values are separated by a colon (:). Characters written to the left of the colon represent the key, while characters written to the right of the colon represent the value.

Spacing matters in YAML format. The following line does not constitute a valid key-value pair:


Note that a space is missing between the colon and the LearnHelm string. This would result in a parsing error. A...