1 <?xml version='1.0'?> <!--*-nxml-*-->
2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
3 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
6 This file is part of systemd.
8 Copyright 2012 Lennart Poettering
10 systemd is free software; you can redistribute it and/or modify it
11 under the terms of the GNU Lesser General Public License as published by
12 the Free Software Foundation; either version 2.1 of the License, or
13 (at your option) any later version.
15 systemd is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Lesser General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 <refentry id="kernel-command-line">
27 <title>kernel-command-line</title>
28 <productname>systemd</productname>
32 <contrib>Developer</contrib>
33 <firstname>Lennart</firstname>
34 <surname>Poettering</surname>
35 <email>lennart@poettering.net</email>
41 <refentrytitle>kernel-command-line</refentrytitle>
42 <manvolnum>7</manvolnum>
46 <refname>kernel-command-line</refname>
47 <refpurpose>Kernel command line parameters</refpurpose>
51 <para><filename>/proc/cmdline</filename></para>
55 <title>Description</title>
57 <para>The kernel, the initial RAM disk (initrd) and
58 basic userspace functionality may be configured at boot via
59 kernel command line arguments.</para>
61 <para>For command line parameters understood by the
62 kernel please see <ulink
63 url="https://www.kernel.org/doc/Documentation/kernel-parameters.txt"><filename>kernel-parameters.txt</filename></ulink>
65 <citerefentry><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
67 <para>For command line parameters understood by the
68 initial RAM disk, please see
69 <citerefentry><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
70 or the documentation of the specific initrd
71 implementation of your installation.</para>
75 <title>Core OS Command Line Arguments</title>
77 <variablelist class='kernel-commandline-options'>
79 <term><varname>systemd.unit=</varname></term>
80 <term><varname>rd.systemd.unit=</varname></term>
81 <term><varname>systemd.dump_core=</varname></term>
82 <term><varname>systemd.crash_shell=</varname></term>
83 <term><varname>systemd.crash_chvt=</varname></term>
84 <term><varname>systemd.confirm_spawn=</varname></term>
85 <term><varname>systemd.show_status=</varname></term>
86 <term><varname>systemd.log_target=</varname></term>
87 <term><varname>systemd.log_level=</varname></term>
88 <term><varname>systemd.log_color=</varname></term>
89 <term><varname>systemd.log_location=</varname></term>
90 <term><varname>systemd.default_standard_output=</varname></term>
91 <term><varname>systemd.default_standard_error=</varname></term>
92 <term><varname>systemd.setenv=</varname></term>
94 <para>Parameters understood by
95 the system and service manager
96 to control system behavior. For details see
97 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
102 <term><varname>quiet</varname></term>
104 <para>Parameter understood by
105 both the kernel and the system
106 and service manager to control
107 console log verbosity. For
109 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
114 <term><varname>debug</varname></term>
116 <para>Parameter understood by
117 both the kernel and the system
118 and service manager to control
119 console log verbosity. For
121 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
126 <term><varname>emergency</varname></term>
127 <term><varname>single</varname></term>
128 <term><varname>s</varname></term>
129 <term><varname>S</varname></term>
130 <term><varname>1</varname></term>
131 <term><varname>2</varname></term>
132 <term><varname>3</varname></term>
133 <term><varname>4</varname></term>
134 <term><varname>5</varname></term>
136 <para>Parameters understood by
137 the system and service
138 manager, as compatibility
139 options. For details see
140 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
145 <term><varname>locale.LANG=</varname></term>
146 <term><varname>locale.LANGUAGE=</varname></term>
147 <term><varname>locale.LC_CTYPE=</varname></term>
148 <term><varname>locale.LC_NUMERIC=</varname></term>
149 <term><varname>locale.LC_TIME=</varname></term>
150 <term><varname>locale.LC_COLLATE=</varname></term>
151 <term><varname>locale.LC_MONETARY=</varname></term>
152 <term><varname>locale.LC_MESSAGES=</varname></term>
153 <term><varname>locale.LC_PAPER=</varname></term>
154 <term><varname>locale.LC_NAME=</varname></term>
155 <term><varname>locale.LC_ADDRESS=</varname></term>
156 <term><varname>locale.LC_TELEPHONE=</varname></term>
157 <term><varname>locale.LC_MEASUREMENT=</varname></term>
158 <term><varname>locale.LC_IDENTIFICATION=</varname></term>
160 <para>Parameters understood by
161 the system and service manager
162 to control locale and language
163 settings. For details see
164 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
169 <term><varname>fsck.mode=</varname></term>
172 <para>Parameter understood by
173 the file system checker
174 services. For details see
175 <citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
180 <term><varname>quotacheck.mode=</varname></term>
183 <para>Parameter understood by
184 the file quota checker
185 service. For details see
186 <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
191 <term><varname>systemd.journald.forward_to_syslog=</varname></term>
192 <term><varname>systemd.journald.forward_to_kmsg=</varname></term>
193 <term><varname>systemd.journald.forward_to_console=</varname></term>
196 <para>Parameters understood by
197 the journal service. For
199 <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
204 <term><varname>vconsole.keymap=</varname></term>
205 <term><varname>vconsole.keymap.toggle=</varname></term>
206 <term><varname>vconsole.font=</varname></term>
207 <term><varname>vconsole.font.map=</varname></term>
208 <term><varname>vconsole.font.unimap=</varname></term>
211 <para>Parameters understood by
212 the virtual console setup logic. For
214 <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
219 <term><varname>udev.log-priority=</varname></term>
220 <term><varname>rd.udev.log-priority=</varname></term>
221 <term><varname>udev.children-max=</varname></term>
222 <term><varname>rd.udev.children-max=</varname></term>
223 <term><varname>udev.exec-delay=</varname></term>
224 <term><varname>rd.udev.exec-delay=</varname></term>
225 <term><varname>net.ifnames=</varname></term>
228 <para>Parameters understood by
229 the device event managing daemon. For
231 <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
236 <term><varname>plymouth.enable=</varname></term>
239 <para>May be used to disable
240 the Plymouth boot splash. For
242 <citerefentry><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
247 <term><varname>luks=</varname></term>
248 <term><varname>rd.luks=</varname></term>
249 <term><varname>luks.crypttab=</varname></term>
250 <term><varname>rd.luks.crypttab=</varname></term>
251 <term><varname>luks.uuid=</varname></term>
252 <term><varname>rd.luks.uuid=</varname></term>
253 <term><varname>luks.key=</varname></term>
254 <term><varname>rd.luks.key=</varname></term>
257 <para>Configures the LUKS
258 full-disk encryption logic at
259 boot. For details see
260 <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
265 <term><varname>fstab=</varname></term>
266 <term><varname>rd.fstab=</varname></term>
270 <filename>/etc/fstab</filename>
271 logic at boot. For details see
272 <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
277 <term><varname>modules-load=</varname></term>
278 <term><varname>rd.modules-load=</varname></term>
281 <para>Load a specific kernel
282 module early at boot. For
284 <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
293 <title>See Also</title>
295 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
296 <citerefentry><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
297 <citerefentry><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
298 <citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
299 <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
300 <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
301 <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
302 <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
303 <citerefentry><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
304 <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
305 <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
306 <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>