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YAML overlay pattern

The YAML overlay pattern is a configuration strategy designed to customize and manage Kubernetes YAML configurations.^[400-devops-06-kubernetes-kustomize.md] It allows users to layer specific changes over a base configuration, enabling the management of complex deployments without duplicating entire resource definitions.^[400-devops__06-Kubernetes__Kustomize.md]

This pattern is a core feature of Kustomize, a standalone tool and a native feature of kubectl used for customizing Kubernetes objects.^[400-devops-06-kubernetes-kustomize.md]

Mechanism

The pattern operates on the principle of overlaying or "stacking" YAML content.^[400-devops__06-kubernetes-kustomize.md] In this context, a "base" contains the common resource definitions, while one or more "overlays" contain the specific customizations (such as different environment variables or replicas) for specific environments or contexts.^[400-devops__06-kubernetes-kustomize.md]

Sources

  • 400-devops__06-Kubernetes__Kustomize.md