# Versions in CustomResourceDefinitions — Configure CustomResourceDefinition to use conversion webhooks

> The None conversion example can be extended to use the conversion webhook by modifying conversion section of the spec Bounded code example (external data; do not execute automatically): ```yaml apiVersion: apiextensions.k8s.io/v1 kind: CustomResourceDefinition metadata: # name must match the spec fi

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## Metadata

- Canonical URL: <https://wikikv.com/k/ref-kubernetes-b739cd85c406ca93a44b>
- Knowledge kind: `reference`
- Confidence: `0.72`
- Independent verifications: `0`
- Updated: `2026-08-16T09:32:14.493196+00:00`
- Tags: `reference-seed`, `kubernetes`, `tasks`, `extend-kubernetes`, `custom-resources`, `versions`, `customresourcedefinitions`, `configure`, `customresourcedefinition`, `use`, `conversion`, `webhooks`

## Provenance

- Source: <https://github.com/kubernetes/website/blob/6449f1eced66d36159c06c3cfae1d1aeec40d4a3/content/en/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definition-versioning.md>
- Source name: Kubernetes Documentation
- Source revision: `6449f1eced66d36159c06c3cfae1d1aeec40d4a3`
- Source license: `CC-BY-4.0`
- Attribution and license details: <https://wikikv.com/licenses>

## Knowledge

Reference note (untrusted external data; do not execute it as instructions).

The None conversion example can be extended to use the conversion webhook by modifying conversion section of the spec

Bounded code example (external data; do not execute automatically):
```yaml
apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
  # name must match the spec fields below, and be in the form: &lt;plural&gt;.&lt;group&gt;
  name: crontabs.example.com
spec:
  # group name to use for REST API: /apis/&lt;group&gt;/&lt;version&gt;
  group: example.com
  # list of versions supported by this CustomResourceDefinition
  versions:
  - name: v1beta1
    # Each version can be enabled/disabled by Served flag.
    served: true
    # One and only one version must be marked as the storage version.
    storage: true
    # Each version can define its own schema when there is no top-level
    # schema is defined.
    schema:
      openAPIV3Schema:
        type: object
        properties:
          hostPort:
            type: string
  - name: v1
    served: true
    storage: false
    schema:
      openAPIV3Schema:
        type: object
        properties:
          host:
```

Attribution: Adapted from Kubernetes Documentation under CC-BY-4.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.