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 follow (tail) text log files, use
       virt-tail(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).

       --blocksize=512
       --blocksize=4096
       --blocksize
           This parameter sets the sector size of the disk image.  It affects all explicitly
           added subsequent disks after this parameter.  Using --blocksize with no argument
           switches the disk sector size to the default value which is usually 512 bytes.  See
           also "guestfs_add_drive_opts" in guestfs(3).

       -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).

       --key SELECTOR
           Specify a key for LUKS, to automatically open a LUKS device when using the inspection.
           "ID" can be either the libguestfs device name, or the UUID of the LUKS device.

           --key "ID":key:KEY_STRING
               Use the specified "KEY_STRING" as passphrase.

           --key "ID":file:FILENAME
               Read the passphrase from FILENAME.

       --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.

           If there are multiple encrypted devices then you may need to supply multiple keys on
           stdin, one per line.

       -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.

SEE ALSO

       guestfs(3), guestfish(1), virt-cat(1), virt-copy-out(1), virt-tail(1), virt-tar-out(1),
       virt-win-reg(1), http://libguestfs.org/.

AUTHOR

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

COPYRIGHT

       Copyright (C) 2010-2020 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.