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>.</para>
65 <para>For command line paramaters understood by the
66 initial RAM disk, please see
67 <citerefentry><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
72 <title>Core OS Command Line Arguments</title>
76 <term><varname>systemd.unit=</varname></term>
77 <term><varname>rd.systemd.unit=</varname></term>
78 <term><varname>systemd.dump_core=</varname></term>
79 <term><varname>systemd.crash_shell=</varname></term>
80 <term><varname>systemd.crash_chvt=</varname></term>
81 <term><varname>systemd.confirm_spawn=</varname></term>
82 <term><varname>systemd.show_status=</varname></term>
83 <term><varname>systemd.log_target=</varname></term>
84 <term><varname>systemd.log_level=</varname></term>
85 <term><varname>systemd.log_color=</varname></term>
86 <term><varname>systemd.log_location=</varname></term>
87 <term><varname>systemd.default_standard_output=</varname></term>
88 <term><varname>systemd.default_standard_error=</varname></term>
89 <term><varname>systemd.setenv=</varname></term>
91 <para>Parameters understood by
92 the system and service manager
93 to control system behaviour. For details see
94 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
99 <term><varname>quiet</varname></term>
101 <para>Parameter understood by
102 both the kernel and the system
103 and service manager to control
104 console log verbosity. For
106 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
111 <term><varname>emergency</varname></term>
112 <term><varname>single</varname></term>
113 <term><varname>s</varname></term>
114 <term><varname>S</varname></term>
115 <term><varname>1</varname></term>
116 <term><varname>2</varname></term>
117 <term><varname>3</varname></term>
118 <term><varname>4</varname></term>
119 <term><varname>5</varname></term>
121 <para>Parameters understood by
122 the system and service
123 manager, as compatibility
124 options. For details see
125 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
130 <term><varname>locale.LANG=</varname></term>
131 <term><varname>locale.LANGUAGE=</varname></term>
132 <term><varname>locale.LC_CTYPE=</varname></term>
133 <term><varname>locale.LC_NUMERIC=</varname></term>
134 <term><varname>locale.LC_TIME=</varname></term>
135 <term><varname>locale.LC_COLLATE=</varname></term>
136 <term><varname>locale.LC_MONETARY=</varname></term>
137 <term><varname>locale.LC_MESSAGES=</varname></term>
138 <term><varname>locale.LC_PAPER=</varname></term>
139 <term><varname>locale.LC_NAME=</varname></term>
140 <term><varname>locale.LC_ADDRESS=</varname></term>
141 <term><varname>locale.LC_TELEPHONE=</varname></term>
142 <term><varname>locale.LC_MEASUREMENT=</varname></term>
143 <term><varname>locale.LC_IDENTIFICATION=</varname></term>
145 <para>Parameters understood by
146 the system and service manager
147 to control locale and language
148 settings. For details see
149 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
154 <term><varname>fsck.mode=</varname></term>
157 <para>Parameter understood by
158 the file system checker
159 services. For details see
160 <citerefentry><refentrytitle>fsck-root.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
165 <term><varname>quotacheck.mode=</varname></term>
168 <para>Parameter understood by
169 the file quota checker
170 service. For details see
171 <citerefentry><refentrytitle>quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
176 <term><varname>systemd.journald.forward_to_syslog=</varname></term>
177 <term><varname>systemd.journald.forward_to_kmsg=</varname></term>
178 <term><varname>systemd.journald.forward_to_console=</varname></term>
181 <para>Parameters understood by
182 the journal service. For
184 <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
189 <term><varname>vconsole.keymap=</varname></term>
190 <term><varname>vconsole.keymap.toggle=</varname></term>
191 <term><varname>vconsole.font=</varname></term>
192 <term><varname>vconsole.font.map=</varname></term>
193 <term><varname>vconsole.font.unimap=</varname></term>
196 <para>Parameters understood by
197 the virtual console setup logic. For
199 <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
204 <term><varname>udev.log-priority=</varname></term>
205 <term><varname>rd.udev.log-priority=</varname></term>
206 <term><varname>udev.children-max=</varname></term>
207 <term><varname>rd.udev.children-max=</varname></term>
208 <term><varname>udev.exec-delay=</varname></term>
209 <term><varname>rd.udev.exec-delay=</varname></term>
212 <para>Parameters understood by
213 the device event managing daemon. For
215 <citerefentry><refentrytitle>systemd-udevd</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
220 <term><varname>plymouth.enable=</varname></term>
223 <para>May be used to disable
224 the Plymouth boot splash. For
226 <citerefentry><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
231 <term><varname>luks=</varname></term>
232 <term><varname>rd.luks=</varname></term>
233 <term><varname>luks.crypttab=</varname></term>
234 <term><varname>rd.luks.crypttab=</varname></term>
235 <term><varname>luks.uuid=</varname></term>
236 <term><varname>rd.luks.uuid=</varname></term>
239 <para>Configures the LUKS
240 full-disk encryption logic at
241 boot. For details see
242 <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
247 <term><varname>fstab=</varname></term>
248 <term><varname>rd.fstab=</varname></term>
252 <filename>/etc/fstab</filename>
253 logic at boot. For details see
254 <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
259 <term><varname>driver=</varname></term>
260 <term><varname>rd.driver=</varname></term>
263 <para>Load a specific kernel
264 boot early at boot. For
266 <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
275 <title>See Also</title>
277 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
278 <citerefentry><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
279 <citerefentry><refentrytitle>fsck-root.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
280 <citerefentry><refentrytitle>quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
281 <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
282 <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
283 <citerefentry><refentrytitle>systemd-udevd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
284 <citerefentry><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
285 <citerefentry><refentrytitle>cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>