virt-tar(1) 仮想マシンへのファイルの展開またはアップロード


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


このツールは推奨されません。 代わりに virt-copy-in(1), virt-copy-out(1), virt-tar-in(1), virt-tar-out(1) を使用してください。

仮想マシンから "/home" をローカルの tar ファイルにダウンロードします:

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

ローカルの tar ファイルをアップロードして、仮想マシンの "/tmp" に展開します:

 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).


-c URI
--connect URI
libvirt を使用していると、指定された URI に接続します。 省略すると、デフォルトの libvirt ハイパーバイザーに接続します。

仮想マシンのブロックデバイスを直接指定すると、libvirt はまったく使用されません。

--format raw
Specify the format of disk images given on the command line. If this is omitted then the format is autodetected from the content of the disk image.

If disk images are requested from libvirt, then this program asks libvirt for this information. In this case, the value of the format parameter is ignored.

If working with untrusted raw-format guest disk images, you should ensure the format is always specified.

仮想マシンからローカル tar ファイルにディレクトリを展開 (ダウンロード) するには -x を使用します。

ローカル tar ファイルから仮想マシンの中にアップロードおよび展開するには -u を使用します。このオプションを使用する前に ``警告'' セクションを参照してください。


入力または出力 tar ファイルを gzip 圧縮するよう指定します。


Richard W.M. Jones


Copyright (C) 2009 Red Hat Inc.



To get a list of bugs against libguestfs, use this link:

To report a new bug against libguestfs, use this link:

When reporting a bug, please supply:

  • The version of libguestfs.
  • Where you got libguestfs (eg. which Linux distro, compiled from source, etc)
  • Describe the bug accurately and give a way to reproduce it.
  • Run libguestfs-test-tool(1) and paste the complete, unedited output into the bug report.