1virt-log(1) Virtualization Support virt-log(1)
2
6 virt-log - Display log files from a virtual machine
7
9 virt-log [--options] -d domname
10 virt-log [--options] -a disk.img [-a disk.img ...]
12
14 "virt-log" is a command line tool to display the log files from the
15 named virtual machine (or disk image).
16 This tool understands and displays both plain text log files (eg.
18 /var/log/messages) and binary formats such as the systemd journal.
19 To display other types of files, use virt-cat(1). To follow (tail)
21 text log files, use virt-tail(1). To copy files out of a virtual
22 machine, use virt-copy-out(1). To display the contents of the Windows
23 Registry, use virt-win-reg(1).
24
26 Display the complete logs from a guest:
27 virt-log -d mydomain | less
29 Find out what DHCP IP address a VM acquired:
31 virt-log -d mydomain | grep 'dhclient.*bound to'
33
35 --help
36 Display brief help.
37 -a file
39 --add file
40 Add file which should be a disk image from a virtual machine. If
41 the virtual machine has multiple block devices, you must supply all
42 of them with separate -a options.
43 The format of the disk image is auto-detected. To override this
45 and force a particular format use the --format=.. option.
46 -a URI
48 --add URI
49 Add a remote disk. See "ADDING REMOTE STORAGE" in guestfish(1).
50 --blocksize=512
52 --blocksize=4096
53 --blocksize
54 This parameter sets the sector size of the disk image. It affects
55 all explicitly added subsequent disks after this parameter. Using
56 --blocksize with no argument switches the disk sector size to the
57 default value which is usually 512 bytes. See also
58 "guestfs_add_drive_opts" in guestfs(3).
59 -c URI
61 --connect URI
62 If using libvirt, connect to the given URI. If omitted, then we
63 connect to the default libvirt hypervisor.
64 If you specify guest block devices directly (-a), then libvirt is
66 not used at all.
67 -d guest
69 --domain guest
70 Add all the disks from the named libvirt guest. Domain UUIDs can
71 be used instead of names.
72 --echo-keys
74 When prompting for keys and passphrases, virt-log normally turns
75 echoing off so you cannot see what you are typing. If you are not
76 worried about Tempest attacks and there is no one else in the room
77 you can specify this flag to see what you are typing.
78 --format=raw|qcow2|..
80 --format
81 The default for the -a option is to auto-detect the format of the
82 disk image. Using this forces the disk format for -a options which
83 follow on the command line. Using --format with no argument
84 switches back to auto-detection for subsequent -a options.
85 For example:
87 virt-log --format=raw -a disk.img
89 forces raw format (no auto-detection) for disk.img.
91 virt-log --format=raw -a disk.img --format -a another.img
93 forces raw format (no auto-detection) for disk.img and reverts to
95 auto-detection for another.img.
96 If you have untrusted raw-format guest disk images, you should use
98 this option to specify the disk format. This avoids a possible
99 security problem with malicious guests (CVE-2010-3851).
100 --key SELECTOR
102 Specify a key for LUKS, to automatically open a LUKS device when
103 using the inspection. "ID" can be either the libguestfs device
104 name, or the UUID of the LUKS device.
105 --key "ID":key:KEY_STRING
107 Use the specified "KEY_STRING" as passphrase.
108 --key "ID":file:FILENAME
110 Read the passphrase from FILENAME.
111 --key "ID":clevis
113 Attempt passphrase-less unlocking for "ID" with Clevis, over
114 the network. Please refer to "ENCRYPTED DISKS" in guestfs(3)
115 for more information on network-bound disk encryption (NBDE).
116 Note that if any such option is present on the command line,
118 QEMU user networking will be automatically enabled for the
119 libguestfs appliance.
120 --keys-from-stdin
122 Read key or passphrase parameters from stdin. The default is to
123 try to read passphrases from the user by opening /dev/tty.
124 If there are multiple encrypted devices then you may need to supply
126 multiple keys on stdin, one per line.
127 -v
129 --verbose
130 Enable verbose messages for debugging.
131 -V
133 --version
134 Display version number and exit.
135 -x Enable tracing of libguestfs API calls.
137
139 This program returns 0 if successful, or non-zero if there was an
140 error.
141
143 guestfs(3), guestfish(1), virt-cat(1), virt-copy-out(1), virt-tail(1),
144 virt-tar-out(1), virt-win-reg(1), http://libguestfs.org/.
145
147 Richard W.M. Jones http://people.redhat.com/~rjones/
148
150 Copyright (C) 2010-2023 Red Hat Inc.
151
153 This program is free software; you can redistribute it and/or modify it
154 under the terms of the GNU General Public License as published by the
155 Free Software Foundation; either version 2 of the License, or (at your
156 option) any later version.
157 This program is distributed in the hope that it will be useful, but
159 WITHOUT ANY WARRANTY; without even the implied warranty of
160 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
161 General Public License for more details.
162 You should have received a copy of the GNU General Public License along
164 with this program; if not, write to the Free Software Foundation, Inc.,
165 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
166
168 To get a list of bugs against libguestfs, use this link:
169 https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools
170 To report a new bug against libguestfs, use this link:
172 https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools
173 When reporting a bug, please supply:
175 • The version of libguestfs.
177 • Where you got libguestfs (eg. which Linux distro, compiled from
179 source, etc)
180 • Describe the bug accurately and give a way to reproduce it.
182 • Run libguestfs-test-tool(1) and paste the complete, unedited output
184 into the bug report.
185guestfs-tools-1.50.1 2023-04-06 virt-log(1)