---
title: CustomResourceDefinition
id: CustomResourceDefinition
date: 2018-04-12
full_link: docs/tasks/access-kubernetes-api/extend-api-custom-resource-definitions/
short_description: >
  Custom code that defines a resource to add to your Kubernetes API server without building a complete custom server.

aka: 
tags:
- fundamental
- operation
- extension
---
 Custom code that defines a resource to add to your Kubernetes API server without building a complete custom server.

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Custom Resource Definitions let you extend the Kubernetes API for your environment if the publicly supported API resources can't meet your needs.