---
title: CustomResourceDefinition
id: CustomResourceDefinition
date: 2018-04-12
full_link: /docs/tasks/extend-kubernetes/custom-resources/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.

<!--more-->

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