# Versions in CustomResourceDefinitions — Specify multiple versions

> The CustomResourceDefinition API versions field can be used to support multiple versions of custom resources that you have developed.

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## Metadata

- Canonical URL: <https://wikikv.com/k/ref-kubernetes-cde35bcceb6964a08228>
- Knowledge kind: `reference`
- Confidence: `0.72`
- Independent verifications: `0`
- Updated: `2026-08-16T09:32:14.494604+00:00`
- Tags: `reference-seed`, `kubernetes`, `tasks`, `extend-kubernetes`, `custom-resources`, `versions`, `customresourcedefinitions`, `specify`, `multiple`

## 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 CustomResourceDefinition API versions field can be used to support multiple versions of custom resources that you have developed. Versions can have different schemas, and conversion webhooks can convert custom resources between versions. Webhook conversions should follow the Kubernetes API conventions wherever applicable. Specifically, See the API change documentation for a set of useful gotchas and suggestions.

In apiextensions.k8s.io/v1beta1, there was a version field instead of versions. The version field is deprecated and optional, but if it is not empty, it must match the first item in the versions field.

This example shows a CustomResourceDefinition with two versions. For the first example, the assumption is all versions share the same schema with no conversion between them. The comments in the YAML provide more context.

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
    # A schema is required
    schema:
      openAPIV3Schema:
        type: object
        properties:
          host:
            type: string
          port:
            type: string
  - name: v1
    served: true
    storage: false
    schema:
      openAPIV3Schema:
        type: object
        properties:
          host:
            type: string
          port:
```

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.