Examples

This section provides a collection of examples demonstrating how to define and use ResourceGraphDefinitions and Graphs in kro for various scenarios. Each example showcases a specific use case and includes a detailed explanation along with the corresponding YAML definitions.

Basic Examples

• Empty ResourceGraphDefinition (Noop) Explore the simplest form of a ResourceGraphDefinition that doesn't define any resources, serving as a reference for the basic structure.

• Simple Web Application Deploy a basic web application with a Deployment and Service.

• Web Application with Ingress Extend the basic web application example to include an optional Ingress resource for external access.

Advanced Examples

• Deploying CoreDNS Learn how to deploy CoreDNS in a Kubernetes cluster using kro ResourceGraphDefinitions, including the necessary Deployment, Service, and ConfigMap.

• SaaS Multi-Tenant This example demonstrates how to create a multi-tenant SaaS application using Kro ResourceGraphDefinitions. It creates isolated tenant environments with dedicated applications, following a hierarchical structure of ResourceGraphDefinitions.

Graph Examples

The Graph API is alpha and disabled by default. These examples show the patterns it enables.

• Namespace Decorator Watch labeled Namespaces and create a default-deny NetworkPolicy in each one, with no CRD or instance.

• Ingress Fan-In Aggregate every labeled Service into a single Ingress with one rule per Service.

• CoreDNS Bundle Install CoreDNS as one dependency-ordered, health-checked object.

• Singleton Controller A small controller written as a Graph: priority-based ownership of a shared resource, with status written back to every claimant.