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virt-v2v-output-rhv - Man Page

Using virt-v2v to convert guests to oVirt or RHV


 virt-v2v [-i* options] -o rhv-upload [-oc ENGINE_URL] -os STORAGE
                        [-op PASSWORD] [-of raw]
                        [-oo rhv-cafile=FILE]
                        [-oo rhv-cluster=CLUSTER]
                        [-oo rhv-proxy]
                        [-oo rhv-disk-uuid=UUID ...]
                        [-oo rhv-verifypeer]

 virt-v2v [-i* options] -o rhv -os [esd:/path|/path]

 virt-v2v [-i* options] -o vdsm
                        [-oo vdsm-image-uuid=UUID]
                        [-oo vdsm-vol-uuid=UUID]
                        [-oo vdsm-vm-uuid=UUID]
                        [-oo vdsm-ovf-output=DIR]


This page documents how to use virt-v2v(1) to convert guests to an oVirt or RHV management instance.  There are three output modes that you can select, but only -o rhv-upload should be used normally, the other two are deprecated:

-o rhv-upload -os STORAGE

Full description: "Output to RHV"

This is the modern method for uploading to oVirt/RHV via the REST API. It requires oVirt/RHV ≥ 4.2.

-o rhv -os esd:/path
-o rhv -os /path

Full description: "Output to Export Storage Domain"

This is the old method for uploading to oVirt/RHV via the Export Storage Domain (ESD).  The ESD can either be accessed over NFS (using the -os esd:/path form) or if you have already NFS-mounted it somewhere specify the path to the mountpoint as -os /path.

The Export Storage Domain was deprecated in oVirt 4, and so we expect that this method will stop working at some point in the future.

-o vdsm

This is the old method used internally by the RHV-M user interface. It is never intended to be used directly by end users.

Output to RHV

This new method to upload guests to oVirt or RHV directly via the REST API requires oVirt/RHV ≥ 4.2.

You need to specify -o rhv-upload as well as the following extra parameters:

-oc https://ovirt-engine.example.com/ovirt-engine/api

The URL of the REST API which is usually the server name with /ovirt-engine/api appended, but might be different if you installed oVirt Engine on a different path.

You can optionally add a username and port number to the URL.  If the username is not specified then virt-v2v defaults to using admin@internal which is the typical superuser account for oVirt instances.

-of raw

Currently you must use -of raw and you cannot use -oa preallocated.

These restrictions will be loosened in a future version.

-op password-file

A file containing a password to be used when connecting to the oVirt engine.  Note the file should contain the whole password, without any trailing newline, and for security the file should have mode 0600 so that others cannot read it.

-os ovirt-data

The storage domain.

-oo rhv-cafile=ca.pem

The ca.pem file (Certificate Authority), copied from /etc/pki/ovirt-engine/ca.pem on the oVirt engine.

If -oo rhv-verifypeer is enabled then this option can be used to control which CA is used to verify the client’s identity.  If this option is not used then the system’s global trust store is used.

-oo rhv-cluster=CLUSTERNAME

Set the RHV Cluster Name.  If not given it uses Default.

-oo rhv-disk-uuid=UUID

This option can used to manually specify UUIDs for the disks when creating the virtual machine.  If not specified, the oVirt engine will generate random UUIDs for the disks.  Please note that:

  • you must pass as many -oo rhv-disk-uuid=UUID options as the amount of disks in the guest
  • the specified UUIDs must not conflict with the UUIDs of existing disks
-oo rhv-proxy

Proxy the upload through oVirt Engine.  This is slower than uploading directly to the oVirt node but may be necessary if you do not have direct network access to the nodes.

-oo rhv-verifypeer

Verify the oVirt/RHV server’s identity by checking the server‘s certificate against the Certificate Authority.

Output to Export Storage Domain

This section only applies to the -o rhv output mode.  If you use virt-v2v from the RHV-M user interface, then behind the scenes the import is managed by VDSM using the -o vdsm output mode (which end users should not try to use directly).

You have to specify -o rhv and an -os option that points to the RHV-M Export Storage Domain.  You can either specify the NFS server and mountpoint, eg. -os rhv-storage:/rhv/export, or you can mount that first and point to the directory where it is mounted, eg. -os /tmp/mnt.  Be careful not to point to the Data Storage Domain by accident as that will not work.

On successful completion virt-v2v will have written the new guest to the Export Storage Domain, but it will not yet be ready to run.  It must be imported into RHV using the UI before it can be used.

In RHV ≥ 2.2 this is done from the Storage tab.  Select the export domain the guest was written to.  A pane will appear underneath the storage domain list displaying several tabs, one of which is "VM Import".  The converted guest will be listed here.  Select the appropriate guest an click "Import".  See the RHV documentation for additional details.

If you export several guests, then you can import them all at the same time through the UI.

Testing RHV conversions

If you do not have an oVirt or RHV instance to test against, then you can test conversions by creating a directory structure which looks enough like a RHV-M Export Storage Domain to trick virt-v2v:

 mkdir /tmp/rhv
 mkdir /tmp/rhv/$uuid
 mkdir /tmp/rhv/$uuid/images
 mkdir /tmp/rhv/$uuid/master
 mkdir /tmp/rhv/$uuid/master/vms
 touch /tmp/rhv/$uuid/dom_md
 virt-v2v [...] -o rhv -os /tmp/rhv

Debugging RHV-M import failures

When you export to the RHV-M Export Storage Domain, and then import that guest through the RHV-M UI, you may encounter an import failure. Diagnosing these failures is infuriatingly difficult as the UI generally hides the true reason for the failure.

There are several log files of interest:


In oVirt ≥ 4.1.0, VDSM preserves the virt-v2v log file for 30 days in this directory.

This directory is found on the host which performed the conversion. The host can be selected in the import dialog, or can be found under the Events tab in oVirt administration.


As above, this file is present on the host which performed the conversion.  It contains detailed error messages from low-level operations executed by VDSM, and is useful if the error was not caused by virt-v2v, but by VDSM.


This log file is stored on the RHV-M server.  It contains more detail for any errors caused by the oVirt GUI.

See Also



Richard W.M. Jones


This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.


To get a list of bugs against libguestfs, use this link: https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools

To report a new bug against libguestfs, use this link: https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools

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Referenced By


2024-07-11 virt-v2v-2.5.5 Virtualization Support