1virt-get-kernel(1) Virtualization Support virt-get-kernel(1)
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6 virt-get-kernel - Extract kernel and ramdisk from guests
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9 virt-get-kernel [--options] -d domname
10 virt-get-kernel [--options] -a disk.img
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14 This option extracts the kernel and initramfs from a guest.
15 The format of the disk image is automatically detected unless you
17 specify it by using the --format option.
18 In the case where the guest contains multiple kernels, the one with the
20 highest version number is chosen. To extract arbitrary kernels from
21 the disk image, see guestfish(1). To extract the entire "/boot"
22 directory of a guest, see virt-copy-out(1).
23
25 --help
26 Display help.
27 -a file
29 --add file
30 Add file which should be a disk image from a virtual machine.
31 The format of the disk image is auto-detected. To override this
33 and force a particular format use the --format option.
34 -a URI
36 --add URI
37 Add a remote disk. The URI format is compatible with guestfish.
38 See "ADDING REMOTE STORAGE" in guestfish(1).
39 --colors
41 --colours
42 Use ANSI colour sequences to colourize messages. This is the
43 default when the output is a tty. If the output of the program is
44 redirected to a file, ANSI colour sequences are disabled unless you
45 use this option.
46 -c URI
48 --connect URI
49 If using libvirt, connect to the given URI. If omitted, then we
50 connect to the default libvirt hypervisor.
51 If you specify guest block devices directly (-a), then libvirt is
53 not used at all.
54 -d guest
56 --domain guest
57 Add all the disks from the named libvirt guest. Domain UUIDs can
58 be used instead of names.
59 --echo-keys
61 When prompting for keys and passphrases, virt-get-kernel normally
62 turns echoing off so you cannot see what you are typing. If you
63 are not worried about Tempest attacks and there is no one else in
64 the room you can specify this flag to see what you are typing.
65 --format raw|qcow2|..
67 --format auto
68 The default for the -a option is to auto-detect the format of the
69 disk image. Using this forces the disk format for the -a option on
70 the command line.
71 If you have untrusted raw-format guest disk images, you should use
73 this option to specify the disk format. This avoids a possible
74 security problem with malicious guests (CVE-2010-3851).
75 --keys-from-stdin
77 Read key or passphrase parameters from stdin. The default is to
78 try to read passphrases from the user by opening /dev/tty.
79 --machine-readable
81 This option is used to make the output more machine friendly when
82 being parsed by other programs. See "MACHINE READABLE OUTPUT"
83 below.
84 -o directory
86 --output directory
87 This option specifies the output directory where kernel and
88 initramfs from the guest are written.
89 If not specified, the default output is the current directory.
91 --prefix prefix
93 This option specifies a prefix for the extracted files.
94 If a prefix is specified, then there will be a dash ("-") after the
96 prefix and before the rest of the file name; for example, a kernel
97 in the guest like "vmlinuz-3.19.0-20-generic" is saved as
98 "mydistro-vmlinuz-3.19.0-20-generic" when the prefix is "mydistro".
99 See also --unversioned-names.
101 -q
103 --quiet
104 Don’t print ordinary progress messages.
105 --unversioned-names
107 This option affects the destination file name of extracted files.
108 If enabled, files will be saved locally just with the base name;
110 for example, kernel and ramdisk in the guest like
111 "vmlinuz-3.19.0-20-generic" and "initrd.img-3.19.0-20-generic" are
112 saved respectively as "vmlinuz" and "initrd.img".
113 See also --prefix.
115 -v
117 --verbose
118 Enable verbose messages for debugging.
119 -V
121 --version
122 Display version number and exit.
123 -x Enable tracing of libguestfs API calls.
125
127 The --machine-readable option can be used to make the output more
128 machine friendly, which is useful when calling virt-get-kernel from
129 other programs, GUIs etc.
130 Use the option on its own to query the capabilities of the virt-get-
132 kernel binary. Typical output looks like this:
133 $ virt-get-kernel --machine-readable
135 virt-get-kernel
136 A list of features is printed, one per line, and the program exits with
138 status 0.
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141 For other environment variables which affect all libguestfs programs,
142 see "ENVIRONMENT VARIABLES" in guestfs(3).
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145 This program returns 0 if successful, or non-zero if there was an
146 error.
147
149 guestfs(3), guestfish(1), guestmount(1), virt-copy-out(1),
150 http://libguestfs.org/.
151
153 Richard W.M. Jones http://people.redhat.com/~rjones/
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156 Copyright (C) 2013-2018 Red Hat Inc.
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159 This program is free software; you can redistribute it and/or modify it
160 under the terms of the GNU General Public License as published by the
161 Free Software Foundation; either version 2 of the License, or (at your
162 option) any later version.
163 This program is distributed in the hope that it will be useful, but
165 WITHOUT ANY WARRANTY; without even the implied warranty of
166 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
167 General Public License for more details.
168 You should have received a copy of the GNU General Public License along
170 with this program; if not, write to the Free Software Foundation, Inc.,
171 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
172
174 To get a list of bugs against libguestfs, use this link:
175 https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools
176 To report a new bug against libguestfs, use this link:
178 https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools
179 When reporting a bug, please supply:
181 · The version of libguestfs.
183 · Where you got libguestfs (eg. which Linux distro, compiled from
185 source, etc)
186 · Describe the bug accurately and give a way to reproduce it.
188 · Run libguestfs-test-tool(1) and paste the complete, unedited output
190 into the bug report.
191libguestfs-1.38.2 2018-05-15 virt-get-kernel(1)