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1 | <?xml version='1.0'?> <!--*-nxml-*--> |
2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" | |
12b42c76 | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
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4 | |
5 | <!-- | |
6 | This file is part of systemd. | |
7 | ||
8 | Copyright 2012 Lennart Poettering | |
9 | ||
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. | |
14 | ||
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. | |
19 | ||
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/>. | |
22 | --> | |
23 | ||
24 | <refentry id="kernel-command-line"> | |
25 | ||
798d3a52 ZJS |
26 | <refentryinfo> |
27 | <title>kernel-command-line</title> | |
28 | <productname>systemd</productname> | |
29 | ||
30 | <authorgroup> | |
31 | <author> | |
32 | <contrib>Developer</contrib> | |
33 | <firstname>Lennart</firstname> | |
34 | <surname>Poettering</surname> | |
35 | <email>lennart@poettering.net</email> | |
36 | </author> | |
37 | </authorgroup> | |
38 | </refentryinfo> | |
39 | ||
40 | <refmeta> | |
41 | <refentrytitle>kernel-command-line</refentrytitle> | |
42 | <manvolnum>7</manvolnum> | |
43 | </refmeta> | |
44 | ||
45 | <refnamediv> | |
46 | <refname>kernel-command-line</refname> | |
47 | <refpurpose>Kernel command line parameters</refpurpose> | |
48 | </refnamediv> | |
49 | ||
50 | <refsynopsisdiv> | |
51 | <para><filename>/proc/cmdline</filename></para> | |
52 | </refsynopsisdiv> | |
53 | ||
54 | <refsect1> | |
55 | <title>Description</title> | |
56 | ||
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> | |
60 | ||
61 | <para>For command line parameters understood by the kernel, please | |
62 | see <ulink | |
63 | url="https://www.kernel.org/doc/Documentation/kernel-parameters.txt"><filename>kernel-parameters.txt</filename></ulink> | |
64 | and | |
65 | <citerefentry project='man-pages'><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para> | |
66 | ||
67 | <para>For command line parameters understood by the initial RAM | |
68 | disk, please see | |
69 | <citerefentry project='die-net'><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>, | |
70 | or the documentation of the specific initrd implementation of your | |
71 | installation.</para> | |
72 | </refsect1> | |
73 | ||
74 | <refsect1> | |
75 | <title>Core OS Command Line Arguments</title> | |
76 | ||
77 | <variablelist class='kernel-commandline-options'> | |
78 | <varlistentry> | |
79 | <term><varname>systemd.unit=</varname></term> | |
80 | <term><varname>rd.systemd.unit=</varname></term> | |
81 | <term><varname>systemd.dump_core=</varname></term> | |
798d3a52 | 82 | <term><varname>systemd.crash_chvt=</varname></term> |
b9e74c39 LP |
83 | <term><varname>systemd.crash_shell=</varname></term> |
84 | <term><varname>systemd.crash_reboot=</varname></term> | |
798d3a52 ZJS |
85 | <term><varname>systemd.confirm_spawn=</varname></term> |
86 | <term><varname>systemd.show_status=</varname></term> | |
87 | <term><varname>systemd.log_target=</varname></term> | |
88 | <term><varname>systemd.log_level=</varname></term> | |
89 | <term><varname>systemd.log_color=</varname></term> | |
90 | <term><varname>systemd.log_location=</varname></term> | |
91 | <term><varname>systemd.default_standard_output=</varname></term> | |
92 | <term><varname>systemd.default_standard_error=</varname></term> | |
93 | <term><varname>systemd.setenv=</varname></term> | |
94 | <listitem> | |
95 | <para>Parameters understood by the system and service | |
96 | manager to control system behavior. For details, see | |
97 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
98 | </listitem> | |
99 | </varlistentry> | |
100 | ||
101 | <varlistentry> | |
102 | <term><varname>systemd.mask=</varname></term> | |
103 | <term><varname>systemd.wants=</varname></term> | |
104 | <term><varname>systemd.debug-shell</varname></term> | |
105 | <listitem> | |
106 | <para>Additional parameters understood by | |
107 | <citerefentry><refentrytitle>systemd-debug-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
108 | to mask or start specific units at boot, or invoke a debug | |
109 | shell on tty9.</para> | |
110 | </listitem> | |
111 | </varlistentry> | |
112 | ||
113 | <varlistentry> | |
114 | <term><varname>systemd.restore_state=</varname></term> | |
115 | <listitem> | |
116 | <para>This parameter is understood by several system tools | |
117 | to control whether or not they should restore system state | |
118 | from the previous boot. For details, see | |
119 | <citerefentry><refentrytitle>systemd-backlight@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
120 | and | |
121 | <citerefentry><refentrytitle>systemd-rfkill@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>. | |
122 | </para> | |
123 | </listitem> | |
124 | </varlistentry> | |
125 | ||
126 | <varlistentry> | |
127 | <term><varname>quiet</varname></term> | |
128 | <listitem> | |
129 | <para>Parameter understood by both the kernel and the system | |
130 | and service manager to control console log verbosity. For | |
131 | details, see | |
132 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
133 | </listitem> | |
134 | </varlistentry> | |
135 | ||
136 | <varlistentry> | |
137 | <term><varname>debug</varname></term> | |
138 | <listitem> | |
139 | <para>Parameter understood by both the kernel and the system | |
140 | and service manager to control console log verbosity. For | |
141 | details, see | |
142 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
143 | </listitem> | |
144 | </varlistentry> | |
145 | ||
146 | <varlistentry> | |
147 | <term><varname>-b</varname></term> | |
148 | <term><varname>emergency</varname></term> | |
149 | <term><varname>rescue</varname></term> | |
150 | <term><varname>single</varname></term> | |
151 | <term><varname>s</varname></term> | |
152 | <term><varname>S</varname></term> | |
153 | <term><varname>1</varname></term> | |
154 | <term><varname>2</varname></term> | |
155 | <term><varname>3</varname></term> | |
156 | <term><varname>4</varname></term> | |
157 | <term><varname>5</varname></term> | |
158 | <listitem> | |
159 | <para>Parameters understood by the system and service | |
160 | manager, as compatibility options. For details, see | |
161 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
162 | </listitem> | |
163 | </varlistentry> | |
164 | ||
165 | <varlistentry> | |
166 | <term><varname>locale.LANG=</varname></term> | |
167 | <term><varname>locale.LANGUAGE=</varname></term> | |
168 | <term><varname>locale.LC_CTYPE=</varname></term> | |
169 | <term><varname>locale.LC_NUMERIC=</varname></term> | |
170 | <term><varname>locale.LC_TIME=</varname></term> | |
171 | <term><varname>locale.LC_COLLATE=</varname></term> | |
172 | <term><varname>locale.LC_MONETARY=</varname></term> | |
173 | <term><varname>locale.LC_MESSAGES=</varname></term> | |
174 | <term><varname>locale.LC_PAPER=</varname></term> | |
175 | <term><varname>locale.LC_NAME=</varname></term> | |
176 | <term><varname>locale.LC_ADDRESS=</varname></term> | |
177 | <term><varname>locale.LC_TELEPHONE=</varname></term> | |
178 | <term><varname>locale.LC_MEASUREMENT=</varname></term> | |
179 | <term><varname>locale.LC_IDENTIFICATION=</varname></term> | |
180 | <listitem> | |
181 | <para>Parameters understood by the system and service | |
182 | manager to control locale and language settings. For | |
183 | details, see | |
184 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
185 | </listitem> | |
186 | </varlistentry> | |
187 | ||
188 | <varlistentry> | |
189 | <term><varname>fsck.mode=</varname></term> | |
190 | <term><varname>fsck.repair=</varname></term> | |
191 | ||
192 | <listitem> | |
193 | <para>Parameters understood by the file system checker | |
194 | services. For details, see | |
195 | <citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
196 | </listitem> | |
197 | </varlistentry> | |
198 | ||
199 | <varlistentry> | |
200 | <term><varname>quotacheck.mode=</varname></term> | |
201 | ||
202 | <listitem> | |
203 | <para>Parameter understood by the file quota checker | |
204 | service. For details, see | |
205 | <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
206 | </listitem> | |
207 | </varlistentry> | |
208 | ||
209 | <varlistentry> | |
210 | <term><varname>systemd.journald.forward_to_syslog=</varname></term> | |
211 | <term><varname>systemd.journald.forward_to_kmsg=</varname></term> | |
212 | <term><varname>systemd.journald.forward_to_console=</varname></term> | |
213 | <term><varname>systemd.journald.forward_to_wall=</varname></term> | |
214 | ||
215 | <listitem> | |
216 | <para>Parameters understood by the journal service. For | |
217 | details, see | |
218 | <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
219 | </listitem> | |
220 | </varlistentry> | |
221 | ||
222 | <varlistentry> | |
223 | <term><varname>vconsole.keymap=</varname></term> | |
224 | <term><varname>vconsole.keymap.toggle=</varname></term> | |
225 | <term><varname>vconsole.font=</varname></term> | |
226 | <term><varname>vconsole.font.map=</varname></term> | |
227 | <term><varname>vconsole.font.unimap=</varname></term> | |
228 | ||
229 | <listitem> | |
230 | <para>Parameters understood by the virtual console setup | |
231 | logic. For details, see | |
232 | <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
233 | </listitem> | |
234 | </varlistentry> | |
235 | ||
236 | <varlistentry> | |
237 | <term><varname>udev.log-priority=</varname></term> | |
238 | <term><varname>rd.udev.log-priority=</varname></term> | |
239 | <term><varname>udev.children-max=</varname></term> | |
240 | <term><varname>rd.udev.children-max=</varname></term> | |
241 | <term><varname>udev.exec-delay=</varname></term> | |
242 | <term><varname>rd.udev.exec-delay=</varname></term> | |
243 | <term><varname>udev.event-timeout=</varname></term> | |
244 | <term><varname>rd.udev.event-timeout=</varname></term> | |
245 | <term><varname>net.ifnames=</varname></term> | |
246 | ||
247 | <listitem> | |
248 | <para>Parameters understood by the device event managing | |
249 | daemon. For details, see | |
250 | <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
251 | </listitem> | |
252 | </varlistentry> | |
253 | ||
254 | <varlistentry> | |
255 | <term><varname>plymouth.enable=</varname></term> | |
256 | ||
257 | <listitem> | |
258 | <para>May be used to disable the Plymouth boot splash. For | |
259 | details, see | |
260 | <citerefentry project='die-net'><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
261 | </listitem> | |
262 | </varlistentry> | |
263 | ||
264 | <varlistentry> | |
265 | <term><varname>luks=</varname></term> | |
266 | <term><varname>rd.luks=</varname></term> | |
267 | <term><varname>luks.crypttab=</varname></term> | |
268 | <term><varname>rd.luks.crypttab=</varname></term> | |
269 | <term><varname>luks.name=</varname></term> | |
270 | <term><varname>rd.luks.name=</varname></term> | |
271 | <term><varname>luks.uuid=</varname></term> | |
272 | <term><varname>rd.luks.uuid=</varname></term> | |
273 | <term><varname>luks.options=</varname></term> | |
274 | <term><varname>rd.luks.options=</varname></term> | |
275 | <term><varname>luks.key=</varname></term> | |
276 | <term><varname>rd.luks.key=</varname></term> | |
277 | ||
278 | <listitem> | |
279 | <para>Configures the LUKS full-disk encryption logic at | |
280 | boot. For details, see | |
281 | <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
282 | </listitem> | |
283 | </varlistentry> | |
284 | ||
285 | <varlistentry> | |
286 | <term><varname>fstab=</varname></term> | |
287 | <term><varname>rd.fstab=</varname></term> | |
288 | ||
289 | <listitem> | |
290 | <para>Configures the <filename>/etc/fstab</filename> logic | |
291 | at boot. For details, see | |
292 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
293 | </listitem> | |
294 | </varlistentry> | |
295 | ||
296 | <varlistentry> | |
297 | <term><varname>root=</varname></term> | |
298 | <term><varname>rootfstype=</varname></term> | |
d6a12e7c | 299 | <term><varname>rootflags=</varname></term> |
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300 | <term><varname>ro</varname></term> |
301 | <term><varname>rw</varname></term> | |
302 | ||
303 | <listitem> | |
304 | <para>Configures the root file system and its file system | |
305 | type and mount options, as well as whether it shall be | |
306 | mounted read-only or read-writable initially. For details, | |
307 | see | |
308 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
309 | </listitem> | |
310 | </varlistentry> | |
311 | ||
312 | <varlistentry> | |
313 | <term><varname>systemd.gpt_auto=</varname></term> | |
314 | <term><varname>rd.systemd.gpt_auto=</varname></term> | |
315 | ||
316 | <listitem> | |
317 | <para>Configures whether GPT based partition auto-discovery | |
318 | shall be attempted. For details, see | |
319 | <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
320 | </listitem> | |
321 | </varlistentry> | |
322 | ||
323 | <varlistentry> | |
324 | <term><varname>modules-load=</varname></term> | |
325 | <term><varname>rd.modules-load=</varname></term> | |
326 | ||
327 | <listitem> | |
328 | <para>Load a specific kernel module early at boot. For | |
329 | details, see | |
330 | <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
331 | </listitem> | |
332 | </varlistentry> | |
333 | ||
334 | <varlistentry> | |
335 | <term><varname>resume=</varname></term> | |
336 | ||
337 | <listitem> | |
338 | <para>Enables resume from hibernation using the specified | |
339 | device. All | |
3ba3a79d | 340 | <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>-like |
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341 | paths are supported. For details, see |
342 | <citerefentry><refentrytitle>systemd-hibernate-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
343 | </listitem> | |
344 | </varlistentry> | |
345 | </variablelist> | |
346 | ||
347 | </refsect1> | |
348 | ||
349 | <refsect1> | |
350 | <title>See Also</title> | |
351 | <para> | |
352 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
353 | <citerefentry project='man-pages'><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>, | |
354 | <citerefentry project='die-net'><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>, | |
355 | <citerefentry><refentrytitle>systemd-debug-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
356 | <citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
357 | <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
358 | <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
359 | <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
360 | <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
361 | <citerefentry project='die-net'><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
362 | <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
363 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
364 | <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
365 | <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
366 | <citerefentry><refentrytitle>systemd-backlight@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
367 | <citerefentry><refentrytitle>systemd-rfkill@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
368 | <citerefentry><refentrytitle>systemd-hibernate-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
369 | </para> | |
370 | </refsect1> | |
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371 | |
372 | </refentry> |