Open Virtualization Format (OVF) is an industry standard that describes metadata about a virtual machine image in an XML format. An OVF package includes an XML descriptor file and optionally disk images, resource files (such as ISO files), manifest files, and certificate files.

An OVA package is a single file that contains all OVF package files in an archived form. After you upload an OVA package to a content library, the OVA file is converted to the standard OVF package.

When you try to upload signed content to a content library, you might receive preview warnings. Signed content can be either OVF or OVA packages that contain manifest and certificate files. If you do not respond to the preview warnings, the upload fails. To complete an upload operation successfully, you must ignore any preview warnings by using the

LibraryItemUpdatesessionWarningBehavior

data structure

.

With the

vSphere Automation

API, you can use the OVF package in a content library to deploy virtual machines and vApps on hosts, resource pools, and clusters. You can also use the API to create OVF packages in content libraries from vApps and virtual machines on hosts, resource pools, and clusters.

When you create library items to store OVF packages, you must set the item type to

ovf

. To comply with the specific standards of the OVF packages, the

vSphere Automation

API provides the

Item

service

.