™.. guestfs-testing - Online Linux Manual PageSection : 1
Updated : 2013-08-27
Source : libguestfs-1.20.11
Note : Virtualization Support
NAMEguestfs−testing − manual testing of libguestfs, you can help!
DESCRIPTIONThis page has manual tests you can try on libguestfs. Everyone has a slightly different combination of platform, hardware and guests, so this testing is very valuable. Thanks for helping out! These tests require libguestfs ≥ 1.14. Tests marked with a * (asterisk) can destroy data if you're not careful. The others are safe and won't modify anything. You can report bugs you find through this link: https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools or post on the mailing list (registration is not required, but if you're not registered then you'll have to wait for a moderator to manually approve your message): https://www.redhat.com/mailman/listinfo/libguestfs
TESTS
Run libguestfs-test-toolRun: ​ libguestfs−test−tool This command does a very simple, non-destructive test that basic libguestfs is functioning. You don't need to run it as root. If it doesn't print \*(C`===== TEST FINISHED OK =====\*(C'\fR, report it as a bug. It is very important that you include the complete, unedited output of \*(C`libguestfs\-test\-tool\*(C'\fR in your bug report. See the ​‟BUGS” section at the end of this page.
Check KVM acceleration is being used.If your host has hardware virt acceleration, then with a hot cache libguestfs should be able to start up in a few seconds. Run the following command a few times: ​ time guestfish −a /dev/null run After a few runs, the time should settle down to a few seconds (under 5 seconds on fast 64 bit hardware). How to check for hardware virt: http://virt−tools.org/learning/check−hardware−virt/ If the command above does not work at all, use ​libguestfs−test−tool (1).
Run virt-alignment-scan on all your guests.Run virt−alignment−scan (1) on guests or disk images: ​ virt−alignment−scan −a /path/to/disk.img or: ​ virt−alignment−scan −d Guest Does the alignment report match how the guest partitions are aligned?
Run virt-cat on some files in guests.​virt−cat (1) can display files from guests. For a Linux guest, try: ​ virt−cat LinuxGuest /etc/passwd A recent feature is support for Windows paths, for example: ​ virt−cat WindowsGuest 'c:\windows\win.ini' An even better test is if you have a Windows guest with multiple drives. Do \*(C`D:\*(C'\fR, \f(CW\*(C`E:\*(C'\fR etc paths work correctly?
* Copy some files into a shut off guest.​virt−copy−in (1) can recursively copy files and directories into a guest or disk image. ​ virt−copy−in −d Guest /etc /tmp This should copy local directory \*(C`/etc\*(C'\fR to \f(CW\*(C`/tmp/etc\*(C'\fR in the guest (recursively). If you boot the guest, can you see all of the copied files and directories? Shut the guest down and try copying multiple files and directories: ​ virt−copy−in −d Guest /home /etc/issue /tmp
Copy some files out of a guest.​virt−copy−out (1) can recursively copy files and directories out of a guest or disk image. ​ virt−copy−out −d Guest /home . Note the final space and period in the command is not a typo. This should copy \*(C`/home\*(C'\fR from the guest into the current directory.
Run virt-df.​virt−df (1) lists disk space. Run: ​ virt−df You can try comparing this to the results from df (1) inside the guest, but there are some provisos: • The guest must be idle. • The guest disks must be synched using sync (1). • Any action such as booting the guest will write log files causing the numbers to change. We don't guarantee that the numbers will be identical even under these circumstances. They should be similar. It would indicate a bug if you saw greatly differing numbers.
Try importing virt-df CSV output into a spreadsheet or database.Run: ​ virt−df −−csv > /tmp/report.csv Now try to load this into your favorite spreadsheet or database. Are the results reproduced faithfully in the spreadsheet/database? http://www.postgresql.org/docs/8.1/static/sql−copy.html http://dev.mysql.com/doc/refman/5.1/en/load−data.html
* Edit a file in a shut off guest.​virt−edit (1) can edit files in guests. Try this command on a RHEL or Fedora guest: ​ virt−edit LinuxGuest /etc/sysconfig/network On other Linux guests try editing other files such as: ​ virt−edit LinuxGuest /etc/motd Are the changes seen inside the guest when it is booted?
Display the filesystems / partitions / LVs in a guest.​virt−filesystems (1) can be used to display filesystems in a guest. Try this command on any disk image or guest: ​ virt−filesystems −a /path/to/disk.img −−all −−long −h or: ​ virt−filesystems −d Guest −−all −−long −h Do the results match what is seen in the guest?
Run virt-inspector on all your guests.Use virt−inspector (1) to get a report on all of your guests or disk images: ​ virt−inspector −a /path/to/disk.img | less or: ​ virt−inspector −d Guest | less Do the results match what is actually in the guest?
Try the auditing features of virt-ls on all your guests.List all setuid or setgid programs in a Linux virtual machine: ​ virt−ls −lR −d Guest / | grep '^− [42]' List all public-writable directories in a Linux virtual machine: ​ virt−ls −lR −d Guest / | grep '^d ...7' List all Unix domain sockets in a Linux virtual machine: ​ virt−ls −lR −d Guest / | grep '^s' List all regular files with filenames ending in '.png': ​ virt−ls −lR −d Guest / | grep −i '^−.*\.png$' Display files larger than 10MB in home directories: ​ virt−ls −lR −d Guest /home | awk '$3 > 10*1024*1024' Find everything modified in the last 7 days: ​ virt−ls −lR −d Guest −−time−days / | awk '$6 <= 7' Find regular files modified in the last 24 hours: ​ virt−ls −lR −d Guest −−time−days / | grep '^−' | awk '$6 < 1' Do the results match what is in the guest?
Create a disk image from a tarball.Use virt−make−fs (1) to create a disk image from any tarball that you happen to have: ​ virt−make−fs −−partition=mbr −−type=vfat /any/tarball.tar.gz output.img Add 'output.img' as a raw disk to an existing guest. Check the guest can see the files. This test is particularly useful if you try it with a Windows guest. Try other partitioning schemes, eg. −−partition=gpt. Try other filesystem formats, eg. −−type=ntfs, −−type=ext2.
* Run virt-rescue on a shut off disk image or guest.Use virt−rescue (1) to examine, rescue or repair a shut off guest or disk image: ​ virt−rescue −a /path/to/disk.img or: ​ virt−rescue −d Guest Can you use ordinary shell commands to examine the guest?
* Resize your guests.Use virt−resize (1) to give a guest some more disk space. For example, if you have a disk image that is smaller than 30G, increase it to 30G by doing: ​ truncate −s 30G newdisk.img ​ virt−filesystems −a /path/to/olddisk.img −−all −−long −h ​ virt−resize /path/to/olddisk.img newdisk.img −−expand /dev/sda1 ​ qemu−kvm −m 1024 −hda newdisk.img Does the guest still boot? Try expanding other partitions.
* Sparsify a guest disk.Using virt−sparsify (1), make a disk image more sparse: ​ virt−sparsify /path/to/olddisk.img newdisk.img Is \*(C`newdisk.img\*(C'\fR still bootable after sparsifying? Is the resulting disk image smaller (use \*(C`du\*(C'\fR to check)?
* ``sysprep'' a shut off Linux guest.Note that this really will mess up an existing guest, so it's better to clone the guest before trying this. ​ virt−sysprep −−hostname newhost.example.com −a /path/to/disk.img Was the sysprep successful? After booting, what changes were made and were they successful?
Dump the Windows Registry from your Windows guests.Use virt−win−reg (1) to dump out the Windows Registry from any Windows guests that you have. ​ virt−win−reg −−unsafe−printable−strings WindowsGuest 'HKLM\Software' | ​ less ​ ​ virt−win−reg −−unsafe−printable−strings WindowsGuest 'HKLM\System' | ​ less Does the output match running \*(C`regedit\*(C'\fR inside the guest? A recent feature is the ability to dump user registries, so try this, replacing username with the name of a local user in the guest: ​ virt−win−reg −−unsafe−printable−strings WindowsGuest 'HKEY_USERS\username' | ​ less
SEE ALSO​guestfs (3), ​guestfish (1), ​guestfs−examples (3), http://libguestfs.org/.
AUTHORSRichard W.M. Jones (\*(C`rjones at redhat dot com\*(C'\fR)
COPYRIGHTCopyright (C) 2011−2012 Red Hat Inc.
LICENSEThis library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110−1301 USA
BUGSTo 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 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. 0
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