=encoding utf8

=head1 НАЗВА

virt-df - Display free space on virtual filesystems

=head1 КОРОТКИЙ ОПИС

 virt-df [--параметри]

 virt-df [--параметри] -d назва_домену

 virt-df [--параметри] -a диск.img [-a диск.img ...]

Старий стиль:

 virt-df [--параметри] назва_домену

 virt-df [--параметри] диск.img [диск.img ...]

=head1 ОПИС

C<virt-df> is a command line tool to display free space on virtual machine
filesystems.  Unlike other tools, it doesn't just display the size of disk
allocated to a virtual machine, but can look inside disk images to see how
much space is really being used.

If used without any I<-a> or I<-d> arguments, C<virt-df> checks with libvirt
to get a list of all active and inactive guests, and performs a C<df>-type
operation on each one in turn, printing out the results.

If any I<-a> or I<-d> arguments are specified, C<virt-df> performs a
C<df>-type operation on either the single named libvirt domain, or on the
disk image(s) listed on the command line (which must all belong to a single
VM).  In this mode (with arguments), C<virt-df> will I<only work for a
single guest>.  If you want to run on multiple guests, then you have to
invoke C<virt-df> multiple times.

Use the I<--csv> option to get a format which can be easily parsed by other
programs.  Other options are similar to the standard L<df(1)> command.

=head1 ПРИКЛАДИ

Show disk usage for a single libvirt guest called C<F14x64>.  Make the
output human-readable:

 # virt-df -d F14x64 -h
 Filesystem                       Size     Used  Available  Use%
 F14x64:/dev/sda1                 484M      66M       393M   14%
 F14x64:/dev/vg_f13x64/lv_root    7.4G     3.4G       4.0G   46%

Show disk usage for a disk image file called C<test.img>:

 $ virt-df -a test1.img
 Filesystem                  1K-blocks     Used  Available  Use%
 test1.img:/dev/sda1             99099     1551      92432    2%

=head1 ПАРАМЕТРИ

=over 4

=item B<--help>

Показати коротку довідку.

=item B<-a> файл

=item B<--add> файл

Add I<file> which should be a disk image from a virtual machine.  If the
virtual machine has multiple block devices, you must supply all of them with
separate I<-a> options.

The format of the disk image is auto-detected.  To override this and force a
particular format use the I<--format=..> option.

=item B<-c> адреса

=item B<--connect> адреса

If using libvirt, connect to the given I<URI>.  If omitted, then we connect
to the default libvirt hypervisor.

If you specify guest block devices directly (I<-a>), then libvirt is not
used at all.

=item B<--csv>

Write out the results in CSV format (comma-separated values).  This format
can be imported easily into databases and spreadsheets, but read L</NOTE
ABOUT CSV FORMAT> below.

=item B<-d> гість

=item B<--domain> гість

Add all the disks from the named libvirt guest.  Domain UUIDs can be used
instead of names.

=item B<--format=raw|qcow2|..>

=item B<--format>

The default for the I<-a> option is to auto-detect the format of the disk
image.  Using this forces the disk format for I<-a> options which follow on
the command line.  Using I<--format> with no argument switches back to
auto-detection for subsequent I<-a> options.

Приклад:

 virt-df --format=raw -a disk.img

forces raw format (no auto-detection) for C<disk.img>.

 virt-df --format=raw -a disk.img --format -a another.img

forces raw format (no auto-detection) for C<disk.img> and reverts to
auto-detection for C<another.img>.

If you have untrusted raw-format guest disk images, you should use this
option to specify the disk format.  This avoids a possible security problem
with malicious guests (CVE-2010-3851).

=item B<-h>

=item B<--human-readable>

Print sizes in human-readable format.

You are not allowed to use I<-h> and I<--csv> at the same time.

=item B<-i>

=item B<--inodes>

Print inodes instead of blocks.

=item B<--one-per-guest>

Run one libguestfs appliance per guest.  Normally C<virt-df> will add the
disks from several guests to a single libguestfs appliance.

You might use this option in the following circumstances:

=over 4

=item *

If you think an untrusted guest might actively try to exploit the libguestfs
appliance kernel, then this prevents one guest from interfering with the
stats printed for another guest.

=item *

If the kernel has a bug which stops it from accessing a filesystem in one
guest (see for example RHBZ#635373) then this allows libguestfs to continue
and report stats for further guests.

=back

=item B<--uuid>

Print UUIDs instead of names.  This is useful for following a guest even
when the guest is migrated or renamed, or when two guests happen to have the
same name.

Note that only domains that we fetch from libvirt come with UUIDs.  For disk
images, we still print the disk image name even when this option is
specified.

=item B<-v>

=item B<--verbose>

Увімкнути докладний показ повідомлень з метою діагностики.

=item B<-V>

=item B<--version>

Показати дані щодо версії і завершити роботу.

=item B<-x>

Увімкнути трасування викликів програмного інтерфейсу libguestfs.

=back

=head1 STATVFS NUMBERS

C<virt-df> (and L<df(1)>) get information by issuing a L<statvfs(3)> system
call.  You can get the same information directly, either from the host
(using libguestfs) or inside the guest:

=over 4

=item З основної системи

Віддайте таку команду:

 guestfish --ro -d НАЗВА_ГОСТЬОВОЇ_СИСТЕМИ -i statvfs /

(change C</> to see stats for other filesystems).

=item З гостьової системи

Віддайте таку команду:

 python -c 'import os; s = os.statvfs ("/"); print s'

(change C</> to see stats for other filesystems).

=back

=head1 ЗАУВАЖЕННЯ ЩОДО ФОРМАТУ CSV

Comma-separated values (CSV) is a deceptive format.  It I<seems> like it
should be easy to parse, but it is definitely not easy to parse.

Myth: Just split fields at commas.  Reality: This does I<not> work
reliably.  This example has two columns:

 "foo,bar",baz

Myth: Read the file one line at a time.  Reality: This does I<not> work
reliably.  This example has one row:

 "foo
 bar",baz

For shell scripts, use C<csvtool> (L<http://merjis.com/developers/csv> also
packaged in major Linux distributions).

For other languages, use a CSV processing library (eg. C<Text::CSV> for Perl
or Python's built-in csv library).

Most spreadsheets and databases can import CSV directly.

=head1 ЕКРАНУВАННЯ СИМВОЛІВ У ОБОЛОНЦІ

Libvirt guest names can contain arbitrary characters, some of which have
meaning to the shell such as C<#> and space.  You may need to quote or
escape these characters on the command line.  See the shell manual page
L<sh(1)> for details.

=head1 СТАН ВИХОДУ

Ця програма повертає значення 0 у разі успішного завершення і ненульове
значення, якщо сталася помилка.

=head1 ТАКОЖ ПЕРЕГЛЯНЬТЕ

L<df(1)>, L<guestfs(3)>, L<guestfish(1)>, L<virt-filesystems(1)>,
L<http://libguestfs.org/>.

=head1 АВТОР

Richard W.M. Jones L<http://people.redhat.com/~rjones/>

=head1 АВТОРСЬКІ ПРАВА

© Red Hat Inc., 2009–2012

Ця програма є вільним програмним забезпеченням; ви можете поширювати та/або
змінювати її за умов дотримання GNU General Public License  утому вигляді,
що оприлюднений Free Software Foundation; версії 2 цієї Ліцензії, або (якщо
забажаєте) будь-якої випущеної пізніше.

Ця програма поширюється у сподіванні, що вона буде корисною, але БЕЗ
БУДЬ-ЯКИХ ГАРАНТІЙНИХ ЗОБОВ’ЯЗАНЬ; навіть без очевидної гарантії
ПРАЦЕЗДАТНОСТІ або ПРИДАТНОСТІ ДЛЯ ВИКОРИСТАННЯ З ПЕВНОЮ МЕТОЮ. Докладніше
про це можна дізнатися з GNU General Public License.

Ви маєте отримати копію GNU General Public License разом з цією програмою;
якщо це не так, повідомте про факт за адресою Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.