virt-tar (1) - Linux Manuals

virt-tar: Extract or upload files to a virtual machine


virt-tar - Extract or upload files to a virtual machine


 virt-tar [--options] -x domname directory tarball

 virt-tar [--options] -u domname tarball directory

 virt-tar [--options] disk.img [disk.img ...] -x directory tarball

 virt-tar [--options] disk.img [disk.img ...] -u tarball directory


Download "/home" from the VM into a local tarball:

 virt-tar -x domname /home home.tar

 virt-tar -zx domname /home home.tar.gz

Upload a local tarball and unpack it inside "/tmp" in the VM:

 virt-tar -u domname uploadstuff.tar /tmp

 virt-tar -zu domname uploadstuff.tar.gz /tmp


You must not use "virt-tar" with the "-u" option (upload) on live virtual machines. If you do this, you risk disk corruption in the VM. "virt-tar" tries to stop you from doing this, but doesn't catch all cases.

You can use "-x" (extract) on live virtual machines, but you might get inconsistent results or errors if there is filesystem activity inside the VM. If the live VM is synched and quiescent, then "virt-tar" will usually work, but the only way to guarantee consistent results is if the virtual machine is shut down.


"virt-tar" is a general purpose archive tool for downloading and uploading parts of a guest filesystem. There are many possibilities: making backups, uploading data files, snooping on guest activity, fixing or customizing guests, etc.

If you want to just view a single file, use virt-cat(1). If you just want to edit a single file, use virt-edit(1). For more complex cases you should look at the guestfish(1) tool.

There are two modes of operation: "-x" (eXtract) downloads a directory and its contents (recursively) from the virtual machine into a local tarball. "-u" uploads from a local tarball, unpacking it into a directory inside the virtual machine. You cannot use these two options together.

In addition, you may need to use the "-z" (gZip) option to enable compression. When uploading, you have to specify "-z" if the upload file is compressed because virt-tar won't detect this on its own.

"virt-tar" can only handle tar (optionally gzipped) format tarballs. For example it cannot do PKZip files or bzip2 compression. If you want that then you'll have to rebuild the tarballs yourself. (This is a limitation of the libguestfs(3) API).


Display brief help.
Display version number and exit.
--connect URI | -c URI
If using libvirt, connect to the given URI. If omitted, then we connect to the default libvirt hypervisor.

If you specify guest block devices directly, then libvirt is not used at all.

-x | --extract | --download
-u | --upload
Use "-x" to extract (download) a directory from a virtual machine to a local tarball.

Use "-u" to upload and unpack from a local tarball into a virtual machine. Please read the ``WARNING'' section above before using this option.

You must specify exactly one of these options.

-z | --gzip
Specify that the input or output tarball is gzip-compressed.


Richard W.M. Jones <>


Copyright (C) 2009 Red Hat Inc.

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., 675 Mass Ave, Cambridge, MA 02139, USA.