The GuestCustomizationSection element includes a customization script and other parameters that are applied when you customize a virtual machine.

The GuestCustomizationSection includes predefined property names that VMware guest customization tools recognize. Certain values in this element, if omitted or left empty, are inherited from the OrgGuestPersonalizationSettings of the organization that owns the virtual machine. See Retrieve or Update Organization Settings.

The vCloud API also supports use of the ovf:ProductSection to pass an arbitrary set of key=value pairs to a vApp or virtual machine through the ovf:Environment element. See Retrieve or Modify ProductSection Elements.

Verify that you are logged in to the vCloud API as an administrator, Catalog Author, or vApp Author.


Retrieve the GuestCustomizationSection to modify.

Make a GET request to the URL in the section's href attribute value.


Modify the retrieved section.

Modified sections must contain all required elements, even if you are not changing their values. Because optional elements revert to default values if they are omitted or empty, it is a best practice to include optional elements in updates. Link elements and href attributes from responses do not need to be included in modified sections. Some elements and attributes might be read-only. See the schema reference for details.


Update the section with your modifications.


In the retrieved section, find the Link element where rel="edit".


Make a PUT request to the URL in that link's href attribute value, and supply the modified section as the request body.

The response to this request is a Task element that tracks the update operation. When the task is complete, the section is updated.

The modified section replaces the contents of the original section. For some section types, modifications take effect immediately. For others, modifications take effect only after a power or deployment state change.

This request specifies guest customization values, including the information required to join the virtual machine to a Windows domain.


If you include a CustomizationScript, it cannot exceed 49,000 characters.


Content-type: application/vnd.vmware.vcloud.guestcustomizationsection+xml
<?xml version="1.0" encoding="UTF-8"?>
   <ovf:Info>Specifies Guest OS Customization Settings</ovf:Info>
   <AdminPassword />
   <CustomizationScript />


202 Accepted
Content-Type: application/vnd.vmware.vcloud.task+xml
   operation="Updating Virtual Application Win2K3 (12)"