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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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 commonly 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 key-value pair:


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