kubernetes-sigs/kro

Kro is a Kubernetes operator that simplifies the creation and management of complex custom resources by allowing you to define reusable groupings of Kubernetes resources.

Kro addresses the challenge of managing intricate multi-resource constructs in Kubernetes by introducing the ResourceGraphDefinition custom resource. This resource lets you declare collections of Kubernetes resources—both native and custom—along with their dependencies and default configurations. When you apply a ResourceGraphDefinition to a cluster, the kro controller validates it, dynamically generates a new CRD, and registers it with the API server. The controller then creates a dedicated microcontroller for each instance, which handles the dependency ordering, resource creation, and lifecycle management of all underlying resources automatically.

Kro is well-suited for teams building complex applications that require coordinating multiple Kubernetes resources with interdependencies. It works best when you want to encapsulate these patterns as reusable components that can be instantiated multiple times without manually managing each resource. The tool integrates with existing Kubernetes workflows and tooling, preserving familiar processes rather than introducing vendor-specific abstractions.

The project maintains active development with regular updates to its core functionality and documentation. The maintainers provide comprehensive guides covering installation, getting started workflows, and conceptual foundations. The project accepts community contributions and maintains clear documentation of how to participate.