title: Is there any documentation on how to use vars in kustomize?
body: <p>I want to use vars without ConfigMaps or Secrets. Declaring a value would be sufficient for me. But I couldn't see any documentation regarding vars attributes or how I can use. Do you know any docs about this? Thanks!</p>
  <pre><code>vars:
    - name: ROUTE_HOST
      objref:
        kind: ConfigMap
        name: template-vars
        apiVersion: v1
      fieldref:
        fieldpath: data.ROUTE_HOST
  </code></pre>