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

Upgrading the WordPress release

Upgrading a release refers to the process of modifying the release’s values or updating the chart to a newer version. In this section, we will upgrade the WordPress release by adding a couple more values to the installation.

Modifying the Helm values

Oftentimes, when deploying applications to Kubernetes, you will want to run multiple replicas of the application to provide high availability and reduce the load on a single instance. Helm charts often provide some sort of replica-related value for configuring the number of pod replicas to deploy. A quick browse through the output of the helm show values bitnami/wordpress --version 12.1.6 command shows that you can increase WordPress replicas by using the replicaCount value:

Figure 3.24 – replicaCount in the helm show values command

Add the following line to your wordpress-values.yaml file to increase the number of replicas from 1 to 2:

replicaCount: 2

Let...