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virt-log(1)

NAME

   virt-log - Display log files from a virtual machine

SYNOPSIS

    virt-log [--options] -d domname

    virt-log [--options] -a disk.img [-a disk.img ...]

DESCRIPTION

   "virt-log" is a command line tool to display the log files from the
   named virtual machine (or disk image).

   This tool understands and displays both plain text log files (eg.
   /var/log/messages) and binary formats such as the systemd journal.

   To display other types of files, use virt-cat(1).  To copy files out of
   a virtual machine, use virt-copy-out(1).  To display the contents of
   the Windows Registry, use virt-win-reg(1).

EXAMPLES

   Display the complete logs from a guest:

    virt-log -d mydomain | less

   Find out what DHCP IP address a VM acquired:

    virt-log -d mydomain | grep 'dhclient.*bound to'

OPTIONS

   --help
       Display brief help.

   -a file
   --add file
       Add 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 -a options.

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

   -a URI
   --add URI
       Add a remote disk.  See "ADDING REMOTE STORAGE" in guestfish(1).

   -c URI
   --connect 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 (-a), then libvirt is
       not used at all.

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

   --echo-keys
       When prompting for keys and passphrases, virt-log normally turns
       echoing off so you cannot see what you are typing.  If you are not
       worried about Tempest attacks and there is no one else in the room
       you can specify this flag to see what you are typing.

   --format=raw|qcow2|..
   --format
       The default for the -a option is to auto-detect the format of the
       disk image.  Using this forces the disk format for -a options which
       follow on the command line.  Using --format with no argument
       switches back to auto-detection for subsequent -a options.

       For example:

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

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

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

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

   --keys-from-stdin
       Read key or passphrase parameters from stdin.  The default is to
       try to read passphrases from the user by opening /dev/tty.

   -v
   --verbose
       Enable verbose messages for debugging.

   -V
   --version
       Display version number and exit.

   -x  Enable tracing of libguestfs API calls.

EXIT STATUS

   This program returns 0 if successful, or non-zero if there was an
   error.

AUTHOR

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

COPYRIGHT

   Copyright (C) 2010-2016 Red Hat Inc.

LICENSE

   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.,
   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

BUGS

   To 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.

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