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guestmount
Langue: en
Version: 2010-09-16 (fedora - 01/12/10)
Section: 1 (Commandes utilisateur)
NAME
guestmount - Mount a guest filesystem on the host using FUSE and libguestfsSYNOPSIS
guestmount [--options] -a disk.img -m device [--ro] mountpoint
WARNING
You must not use "guestmount" in read-write mode on live virtual machines. If you do this, you risk disk corruption in the VM.DESCRIPTION
The guestmount program can be used to mount virtual machine filesystems and other disk images on the host. It uses libguestfs for access to the guest filesystem, and FUSE (the ``filesystem in userspace'') to make it appear as a mountable device.Along with other options, you have to give at least one device (-a option) and at least one mountpoint (-m option). How this works is better explained in the guestfish(1) manual page, or you can use virt-inspector(1) and/or the wrapper script "guestmount-wrapper" to help you.
FUSE lets you mount filesystems as non-root. The mountpoint must be owned by you, and the filesystem will not be visible to any other users unless you make certain global configuration changes to "/etc/fuse.conf". To unmount the filesystem, use the "fusermount -u" command.
EXAMPLES
For a typical Windows guest which has its main filesystem on the first partition:guestmount -a windows.img -m /dev/sda1 --ro /mnt
For a typical Linux guest which has a /boot filesystem on the first partition, and the root filesystem on a logical volume:
guestmount -a linux.img -m /dev/VG/LV -m /dev/sda1:/boot --ro /mnt
To get virt-inspector(1) to do the hard work of detecting guest mountpoints for you:
guestmount $(virt-inspector --ro-fish MyGuest) /mnt
(or use --fish if you don't want it to be a read only mount). The option is called --ro-fish or --fish because these parameters are compatible with guestfish(1).
If you don't know what filesystems are contained in a guest or disk image, use virt-list-filesystems(1) first:
virt-list-filesystems MyGuest
If you want to trace the libguestfs calls but without excessive debugging, we recommend:
guestmount [-a ... -m ...] --trace /mnt
If you want to debug the program, we recommend:
guestmount [-a ... -m ...] --trace --verbose /mnt
OPTIONS
- -a image | --add image
- Add a block device or virtual machine image.
- --dir-cache-timeout N
- Set the readdir cache timeout to N seconds, the default being 60 seconds. The readdir cache [actually, there are several semi-independent caches] is populated after a readdir(2) call with the stat and extended attributes of the files in the directory, in anticipation that they will be requested soon after.
There is also a different attribute cache implemented by FUSE (see the FUSE option -o attr_timeout), but the FUSE cache does not anticipate future requests, only cache existing ones.
- --fuse-help
- Display help on special FUSE options (see -o below).
- --help
- Display brief help and exit.
- -m dev[:mnt] | --mount dev[:mnt]
- Mount the named partition or logical volume on the given mountpoint in the guest (this has nothing to do with mountpoints in the host).
If the mountpoint is omitted, it defaults to "/". You have to mount something on "/".
- -n | --no-sync
- By default, we attempt to sync the guest disk when the FUSE mountpoint is unmounted. If you specify this option, then we don't attempt to sync the disk. See the discussion of autosync in the guestfs(3) manpage.
- -o option | --option option
- Pass extra options to FUSE.
To get a list of all the extra options supported by FUSE, use the command below. Note that only the FUSE -o options can be passed, and only some of them are a good idea.
guestmount --fuse-help
Some potentially useful FUSE options:
-
- -o allow_other
- Allow other users to see the filesystem.
- -o attr_timeout=N
- Enable attribute caching by FUSE, and set the timeout to N seconds.
- -o kernel_cache
- Allow the kernel to cache files (reduces the number of reads that have to go through the guestfs(3) API). This is generally a good idea if you can afford the extra memory usage.
- -o uid=N -o gid=N
- Use these options to map all UIDs and GIDs inside the guest filesystem to the chosen values.
-
- -r | --ro
- Add devices and mount everything read-only. Also disallow writes and make the disk appear read-only to FUSE.
This is highly recommended if you are not going to edit the guest disk. If the guest is running and this option is not supplied, then there is a strong risk of disk corruption in the guest. We try to prevent this from happening, but it is not always possible.
- --selinux
- Enable SELinux support for the guest.
- --trace
- Trace libguestfs calls (to stderr).
This also stops the daemon from forking into the background.
- -v | --verbose
- Enable verbose messages from underlying libguestfs.
- -V | --version
- Display the program version and exit.
SEE ALSO
guestfish(1), virt-inspector(1), virt-cat(1), virt-edit(1), virt-tar(1), guestfs(3), <http://libguestfs.org/>, <http://fuse.sf.net/>.AUTHORS
Richard W.M. Jones ("rjones at redhat dot com")COPYRIGHT
Copyright (C) 2009 Red Hat Inc. <http://libguestfs.org/>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.
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre