About the OVF Format

OVF is a cross-platform standard supported by many virtualization products which enables the creation of ready-made virtual machines that can then be imported into a hypervisor such as . makes OVF import and export easy to do, using or the command-line interface.

Using OVF enables packaging of virtual appliances. These are disk images, together with configuration settings that can be distributed easily. This way one can offer complete ready-to-use software packages, including OSes with applications, that need no configuration or installation except for importing into .

The OVF standard is complex, and support in is an ongoing process. No guarantee is made that supports all appliances created by other virtualization software. In particular, the following limitations exist:

OVF localization, with multiple languages in a single OVF file, is not yet supported.
Some OVF sections like StartupSection, DeploymentOptionSection, and InstallSection are ignored.
OVF environment documents, including their property sections are not yet supported.
Remote files using HTTP or other mechanisms are not yet supported.

Appliances in OVF format can appear in the following variants:

They can come in several files, as one or several disk images, typically in the widely-used VMDK format. See . They also include a textual description file in an XML dialect with an .ovf extension. These files must then reside in the same directory for to be able to import them.
Alternatively, the above files can be packed together into a single archive file, typically with an .ova extension. Such archive files use a variant of the TAR archive format and can therefore be unpacked outside of with any utility that can unpack standard TAR files.

OVF cannot describe snapshots that were taken for a virtual machine. As a result, when you export a virtual machine that has snapshots, only the current state of the machine will be exported. The disk images in the export will have a flattened state identical to the current state of the virtual machine.