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  • Book Overview & Buying Managing Kubernetes Resources Using Helm
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Managing Kubernetes Resources Using Helm

Managing Kubernetes Resources Using Helm - Second Edition

By : Andrew Block, Austin Dewey
5 (3)
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Managing Kubernetes Resources Using Helm

Managing Kubernetes Resources Using Helm

5 (3)
By: Andrew Block, Austin Dewey
Buy this Book

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)
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Preface
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Preface
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Who this book is for
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What this book covers
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To get the most out of this book
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Download the example code files
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Download the color images
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Conventions used
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Get in touch
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Share Your Thoughts
1
Part 1: Introduction and Setup
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Part 1: Introduction and Setup
Lock Free Chapter
2
Chapter 1: Understanding Kubernetes and Helm
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Chapter 1: Understanding Kubernetes and Helm
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From monoliths to modern microservices
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What is Kubernetes?
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Deploying a Kubernetes application
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Approaches to resource management
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Resource configuration challenges
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Helm to the rescue!
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Summary
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Further reading
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Questions
3
Chapter 2: Preparing a Kubernetes and Helm Environment
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Chapter 2: Preparing a Kubernetes and Helm Environment
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Technical requirements
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Preparing a local Kubernetes environment with minikube
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Setting up kubectl
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Setting up Helm
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Configuring Helm
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Summary
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Further reading
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Questions
4
Chapter 3: Installing Your First App with Helm
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Chapter 3: Installing Your First App with Helm
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Technical requirements
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Understanding the WordPress application
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Finding a WordPress chart
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Creating a Kubernetes environment
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Installing a WordPress chart
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Choosing between --set and --values
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Accessing the WordPress application
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Upgrading the WordPress release
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Rolling back the WordPress release
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Uninstalling the WordPress release
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Shutting down your environment
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Summary
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Further reading
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Questions
5
Part 2: Helm Chart Development
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Part 2: Helm Chart Development
6
Chapter 4: Scaffolding a New Helm Chart
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Chapter 4: Scaffolding a New Helm Chart
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Technical requirements
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Understanding the Guestbook application
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Understanding the YAML format
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Scaffolding the Guestbook Helm chart
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Deploying the scaffolded Guestbook chart
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Understanding the Chart.yaml file
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Updating the Guestbook Chart.yaml file
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Summary
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Further reading
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Questions
7
Chapter 5: Helm Dependency Management
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Chapter 5: Helm Dependency Management
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Technical requirements
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Declaring chart dependencies
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The dependencies map
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Downloading chart dependencies
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Creating conditionals
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Altering dependency names and values
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Updating the guestbook Helm chart
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Cleaning up
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Summary
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Further reading
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Questions
8
Chapter 6: Understanding Helm Templates
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Chapter 6: Understanding Helm Templates
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Technical requirements
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Helm template basics
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Template values
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Built-in objects
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Helm template functions
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Helm template control structures
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Generating release notes
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Helm template variables
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Helm template validation
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Enabling code reuse with named templates and library charts
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Creating CRDs
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Post rendering
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Updating and deploying the Guestbook chart
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Summary
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Further reading
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Questions
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Chapter 7: Helm Lifecycle Hooks
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Chapter 7: Helm Lifecycle Hooks
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Technical requirements
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The basics of a Helm hook
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Helm hook life cycle
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Helm hook cleanup
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Writing hooks in the Guestbook Helm chart
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Cleaning up
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Summary
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Further reading
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Questions
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Chapter 8: Publishing to a Helm Chart Repository
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Chapter 8: Publishing to a Helm Chart Repository
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Technical requirements
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Understanding Helm chart repositories
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Publishing to an HTTP repository
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Publishing to an OCI registry
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Summary
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Further reading
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Questions
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Chapter 9: Testing Helm Charts
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Chapter 9: Testing Helm Charts
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Technical requirements
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Setting up your environment
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Verifying Helm templating
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Testing in a live cluster
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Improving chart tests with the Chart Testing tool
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Cleaning up
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Summary
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Further reading
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Questions
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Part 3: Advanced Deployment Patterns
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Part 3: Advanced Deployment Patterns
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Chapter 10: Automating Helm with CD and GitOps
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Chapter 10: Automating Helm with CD and GitOps
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Technical requirements
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Understanding CI/CD and GitOps
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Setting up your environment
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Installing Argo CD
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Deploying a Helm chart from a Git repository
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Deploying an application from a remote Helm chart repository
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Deploying a Helm chart to multiple environments
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Cleaning up
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Summary
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Questions
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Chapter 11: Using Helm with the Operator Framework
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Chapter 11: Using Helm with the Operator Framework
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Technical requirements
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Understanding Kubernetes operators
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Understanding the Guestbook operator control loop
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Using Helm to manage operators, CRDs, and CRs
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Cleaning up
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Summary
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Further reading
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Questions
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Chapter 12: Helm Security Considerations
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Chapter 12: Helm Security Considerations
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Technical requirements
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Data provenance and integrity
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Developing secure and stable Helm charts
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Configuring RBAC rules
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Summary
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Further reading
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Questions
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Index
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Index
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Why subscribe?
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Other Books You May Enjoy
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Other Books You May Enjoy
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Template values

In previous chapters, we described values as parameters that are used to configure a Helm chart. Now, we will gain an understanding of how values are integrated into chart templates to dynamically generate Kubernetes resources.

Here is a basic ConfigMap template from the Git repository at chapter6/examples/values-example/templates/configmap.yaml:

apiVersion: v1
kind: ConfigMap
metadata:
  name: values-example
data:
  config.properties: |-
    chapterNumber={{ .Values.chapterNumber }}
    chapterName={{ .Values.chapterName }}

The last two lines of this template contain {{ .Values.chapterNumber }} and {{ .Values.chapterName }} actions, which are used as placeholders for the chapterNumber and chapterName values. This allows the ConfigMap to be parameterized based on the default chart values and the values the user provides during installation or upgrade.

Let’s take a look at the default chart...

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Managing Kubernetes Resources Using Helm
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