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DevOps & Automation · Advanced

Custom Resource Definition (CRD)

A Kubernetes API extension that defines a new resource type that can be managed like built-in objects.

Definition

CRDs add kinds such as Certificate, Application, or VirtualService, with OpenAPI schema validation. Controllers or operators act on the custom resources.

Example

kubectl get crd lists installed definitions such as certificates.cert-manager.io.

Exam tip

A CRD alone only stores data; a controller is needed to act on it.

Related terms