Learning Helm: Managing Apps on Kubernetes
- Length: 198 pages
- Edition: 1
- Language: English
- Publisher: O'Reilly Media
- Publication Date: 2021-02-16
- ISBN-10: 1492083658
- ISBN-13: 9781492083658
- Sales Rank: #1087124 (See Top 100 Books)
Get up to speed with Helm, the preeminent package manager for the Kubernetes container orchestration system. This practical guide shows you how to efficiently create, install, and manage the applications running inside your containers. Helm maintainers Matt Butcher, Matt Farina, and Josh Dolitsky explain how this package manager fits into the Kubernetes ecosystem and provide an inside look at Helm’s design and best practices.
More than 70% of the organizations that work with Kubernetes use Helm today. While the Helm community provides thousands of packages, or charts, to help you get started, this book walks developers and DevOps engineers through the process of creating custom charts to package applications. If you have a working understanding of Kubernetes, you’re ready to go.
- Explore primary features including frequently used Helm commands
- Learn how to build and deploy Helm charts from scratch
- Use Helm to manage complexity and achieve repeatable deployments
- Package an application and its dependencies for easy installation
- Manage the entire lifecycle of applications on Kubernetes
- Explore ways to extend Helm to add features and functionality
- Learn features for testing, handling dependencies, and providing security
Preface Who Should Read This Book Why We Wrote This Book Navigating This Book Conventions Used in This Book Using Code Examples O’Reilly Online Learning How to Contact Us Acknowledgments 1. Introducing Helm The Cloud Native Ecosystem Containers and Microservices Microservices Containers Container images and registries Schedules and Kubernetes Declarative infrastructure The reconciliation loop From containers to pods, services, deployments, etc. Helm’s Goals From Zero to Kubernetes Package Management Security, Reusability, and Configurability Security Reusability Configurability Helm’s Architecture Kubernetes Resources Charts Resources, Installations, and Releases A Brief Note About Helm 2 Conclusion 2. Using Helm Installing and Configuring the Helm Client Installing a Prebuilt Binary A note on Helm version numbers Downloading the binary Using the get script to install Guidance on Building from Source Working with Kubernetes Clusters Getting Started with Helm Adding a Chart Repository Searching a Chart Repository Installing a Package Configuration at Installation Time Listing Your Installations Upgrading an Installation Configuration Values and Upgrades Uninstalling an Installation How Helm Stores Release Information Conclusion 3. Beyond the Basics with Helm Templating and Dry Runs The --dry-run Flag The helm template Command Learning About a Release Release Records Listing Releases Find Details of a Release with helm get Using helm get notes Using helm get values Using helm get manifest History and Rollbacks Keeping History and Rolling Back A Deep Dive into Installs and Upgrades The --generate-name and --name-template Flags The --create-namespace Flag Using helm upgrade --install The --wait and --atomic Flags Upgrading with --force and --cleanup-on-fail Conclusion 4. Building a Chart The Chart Creation Command The Chart.yaml File Modifying Templates The Deployment Using the Values File Container Images Exposing Services Resource Limits Packaging the Chart Linting Charts Conclusion 5. Developing Templates The Template Syntax Actions Information Helm Passes to Templates Pipelines Template Functions Methods Querying Kubernetes Resources In Charts if/else/with Variables Loops Named Templates Structuring Your Templates for Maintainability Debugging Templates Dry Run Getting Installed Manifests Linting Charts Conclusion 6. Advanced Chart Features Chart Dependencies Conditional Flags for Enabling Dependencies Importing Values from Child to Parent Charts The exports property The child-parent format Library Charts Schematizing Values Files Hooks Adding Tests to Charts Helm Test Chart Testing Tool Security Considerations Custom Resource Definitions Conclusion 7. Chart Repositories The Repository Index An Example of a Chart Repository Index Generating an Index Adding to an Existing Index Setting Up a Chart Repository A Simple Chart Repository with Python Securing a Chart Repository Basic auth Client certificates Real-World Example: Using GitHub Pages Create a new Git repo Enable GitHub Pages Optional: Use a custom domain Adding chart repository files Using your GitHub Pages site as a chart repository Using Chart Repositories Adding a Repository Downloading Charts Listing Repositories Updating Repositories Removing a Repository Experimental OCI Support Enabling OCI Support Running a Local Registry Logging In to a Registry Logging Out of a Registry Storing a Chart in the Cache Listing Charts in the Cache Exporting a Chart from the Cache Pushing a Chart to the Registry Pulling a Chart from the Registry Removing a Chart from the Cache Related Projects ChartMuseum Harbor Chart Releaser S3 Plugin GCS Plugin Git Plugin 8. Helm Plugins and Starters Plugins Installing Third-Party Plugins Custom Subcommands Building a Plugin The underlying implementation The plugin manifest Manual installation The end result plugin.yaml Hooks Downloader Plugins Execution Environment Shell Completion Static autocompletion Dynamic completion Starters Converting a Chart to a Starter Making Starters Available to Helm Using Starters Extending Helm Further A. Chart API Versions API Version 2 The Chart.yaml File Field: apiVersion Field: name Field: version Field: type Field: description Field: appVersion Field: home Field: icon Field: sources Field: keywords Field: maintainers Field: deprecated Field: annotations Field: kubeVersion Field: dependencies The Chart.lock File API Version 1 (legacy) The Chart.yaml File Differences from v2 Field: tillerVersion (legacy) Field: engine (legacy) The requirements.yaml File (Legacy) The requirements.lock File (Legacy) B. Chart Repository API index.yaml The index.yaml Format When Is index.yaml Downloaded? When Is the Cached Version of index.yaml Used? .tgz Files When Are .tgz Files Downloaded? .prov Files When Are .prov Files Downloaded? Index
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