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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
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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
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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
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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
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Part 2: Helm Chart Development
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Part 2: Helm Chart Development
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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
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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
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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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Deploying a Kubernetes application

Deploying an application on Kubernetes is fundamentally similar to deploying an application outside of Kubernetes. All applications, whether containerized or not, must consider the following configuration details:

  • Networking
  • Persistent storage and file mounts
  • Resource allocation
  • Availability and redundancy
  • Runtime configuration
  • Security

Configuring these details on Kubernetes is done by interacting with the Kubernetes application programming interface (API). The Kubernetes API serves as a set of endpoints that can be interacted with to view, modify, or delete different Kubernetes resources, many of which are used to configure different details of an application.

There are many different Kubernetes API resources, but the following table shows some of the most common ones:

Resource Name

Definition

Pod

The smallest deployable unit in Kubernetes. Encapsulates one or more containers.

Deployment

Used to deploy and manage a set of Pods. Maintains the desired amount of Pod replicas (1 by default).

StatefulSet

Similar to a Deployment resource, except a StatefulSet maintains a sticky identity for each Pod replica and can also provision PersistentVolumeClaims resources (explained further down in this table) unique to each Pod.

Service

Used to load-balance between Pod replicas.

Ingress

Provides external access to services within the cluster.

ConfigMap

Stores application configuration to decouple configuration from code.

Secret

Used to store sensitive data such as credentials and keys. Data stored in Secrets resources are only obfuscated using Base64 encoding, so administrators must ensure that proper access controls are in place.

PersistentVolumeClaim

A request for storage by a user. Used to provide persistence for running Pods.

Role

Represents a set of permissions to be allowed against the Kubernetes API.

RoleBinding

Grants the permissions defined in a role to a user or set of users.

Table 1.1 – Common Kubernetes resources

Creating resources is central to deploying and managing an application on Kubernetes, but what does a user need to do to create them? We will explore this question further in the next section.

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Managing Kubernetes Resources Using Helm
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