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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"> | |
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 | ||
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 | |
14228c0d | 62 | kernel, please see <ulink |
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63 | url="https://www.kernel.org/doc/Documentation/kernel-parameters.txt"><filename>kernel-parameters.txt</filename></ulink> |
64 | and | |
5eef597e | 65 | <citerefentry project='man-pages'><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para> |
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66 | |
67 | <para>For command line parameters understood by the | |
68 | initial RAM disk, please see | |
5eef597e | 69 | <citerefentry project='die-net'><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>, |
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70 | or the documentation of the specific initrd |
71 | implementation of your 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> | |
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> | |
93 | <listitem> | |
94 | <para>Parameters understood by | |
95 | the system and service manager | |
14228c0d | 96 | to control system behavior. For details, see |
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97 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> |
98 | </listitem> | |
99 | </varlistentry> | |
100 | ||
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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 | |
107 | understood by | |
108 | <citerefentry><refentrytitle>systemd-debug-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
109 | to mask or start specific | |
110 | units at boot, or invoke a | |
111 | debug shell on tty9.</para> | |
112 | </listitem> | |
113 | </varlistentry> | |
114 | ||
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115 | <varlistentry> |
116 | <term><varname>systemd.restore_state=</varname></term> | |
117 | <listitem> | |
118 | <para>This parameter is understood by | |
119 | several system tools to control | |
120 | whether or not they should restore | |
121 | system state from the previous boot. | |
122 | For details, see | |
123 | <citerefentry><refentrytitle>systemd-backlight@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
124 | and | |
125 | <citerefentry><refentrytitle>systemd-rfkill@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>. | |
126 | </para> | |
127 | </listitem> | |
128 | </varlistentry> | |
129 | ||
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130 | <varlistentry> |
131 | <term><varname>quiet</varname></term> | |
132 | <listitem> | |
133 | <para>Parameter understood by | |
134 | both the kernel and the system | |
135 | and service manager to control | |
136 | console log verbosity. For | |
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137 | details, see |
138 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
139 | </listitem> | |
140 | </varlistentry> | |
141 | ||
142 | <varlistentry> | |
143 | <term><varname>debug</varname></term> | |
144 | <listitem> | |
145 | <para>Parameter understood by | |
146 | both the kernel and the system | |
147 | and service manager to control | |
148 | console log verbosity. For | |
149 | details, see | |
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150 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> |
151 | </listitem> | |
152 | </varlistentry> | |
153 | ||
154 | <varlistentry> | |
60f067b4 | 155 | <term><varname>-b</varname></term> |
663996b3 | 156 | <term><varname>emergency</varname></term> |
5eef597e | 157 | <term><varname>rescue</varname></term> |
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158 | <term><varname>single</varname></term> |
159 | <term><varname>s</varname></term> | |
160 | <term><varname>S</varname></term> | |
161 | <term><varname>1</varname></term> | |
162 | <term><varname>2</varname></term> | |
163 | <term><varname>3</varname></term> | |
164 | <term><varname>4</varname></term> | |
165 | <term><varname>5</varname></term> | |
166 | <listitem> | |
167 | <para>Parameters understood by | |
168 | the system and service | |
169 | manager, as compatibility | |
14228c0d | 170 | options. For details, see |
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171 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> |
172 | </listitem> | |
173 | </varlistentry> | |
174 | ||
175 | <varlistentry> | |
176 | <term><varname>locale.LANG=</varname></term> | |
177 | <term><varname>locale.LANGUAGE=</varname></term> | |
178 | <term><varname>locale.LC_CTYPE=</varname></term> | |
179 | <term><varname>locale.LC_NUMERIC=</varname></term> | |
180 | <term><varname>locale.LC_TIME=</varname></term> | |
181 | <term><varname>locale.LC_COLLATE=</varname></term> | |
182 | <term><varname>locale.LC_MONETARY=</varname></term> | |
183 | <term><varname>locale.LC_MESSAGES=</varname></term> | |
184 | <term><varname>locale.LC_PAPER=</varname></term> | |
185 | <term><varname>locale.LC_NAME=</varname></term> | |
186 | <term><varname>locale.LC_ADDRESS=</varname></term> | |
187 | <term><varname>locale.LC_TELEPHONE=</varname></term> | |
188 | <term><varname>locale.LC_MEASUREMENT=</varname></term> | |
189 | <term><varname>locale.LC_IDENTIFICATION=</varname></term> | |
190 | <listitem> | |
191 | <para>Parameters understood by | |
192 | the system and service manager | |
193 | to control locale and language | |
14228c0d | 194 | settings. For details, see |
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195 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> |
196 | </listitem> | |
197 | </varlistentry> | |
198 | ||
199 | <varlistentry> | |
200 | <term><varname>fsck.mode=</varname></term> | |
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201 | <term><varname>fsck.repair=</varname></term> |
202 | ||
203 | <listitem> | |
e842803a | 204 | <para>Parameters understood by |
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205 | the file system checker |
206 | services. For details, see | |
207 | <citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
208 | </listitem> | |
209 | </varlistentry> | |
210 | ||
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211 | <varlistentry> |
212 | <term><varname>quotacheck.mode=</varname></term> | |
213 | ||
214 | <listitem> | |
215 | <para>Parameter understood by | |
216 | the file quota checker | |
14228c0d | 217 | service. For details, see |
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218 | <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> |
219 | </listitem> | |
220 | </varlistentry> | |
221 | ||
222 | <varlistentry> | |
223 | <term><varname>systemd.journald.forward_to_syslog=</varname></term> | |
224 | <term><varname>systemd.journald.forward_to_kmsg=</varname></term> | |
225 | <term><varname>systemd.journald.forward_to_console=</varname></term> | |
60f067b4 | 226 | <term><varname>systemd.journald.forward_to_wall=</varname></term> |
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227 | |
228 | <listitem> | |
229 | <para>Parameters understood by | |
230 | the journal service. For | |
14228c0d | 231 | details, see |
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232 | <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> |
233 | </listitem> | |
234 | </varlistentry> | |
235 | ||
236 | <varlistentry> | |
237 | <term><varname>vconsole.keymap=</varname></term> | |
238 | <term><varname>vconsole.keymap.toggle=</varname></term> | |
239 | <term><varname>vconsole.font=</varname></term> | |
240 | <term><varname>vconsole.font.map=</varname></term> | |
241 | <term><varname>vconsole.font.unimap=</varname></term> | |
242 | ||
243 | <listitem> | |
244 | <para>Parameters understood by | |
245 | the virtual console setup logic. For | |
14228c0d | 246 | details, see |
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247 | <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> |
248 | </listitem> | |
249 | </varlistentry> | |
250 | ||
251 | <varlistentry> | |
252 | <term><varname>udev.log-priority=</varname></term> | |
253 | <term><varname>rd.udev.log-priority=</varname></term> | |
254 | <term><varname>udev.children-max=</varname></term> | |
255 | <term><varname>rd.udev.children-max=</varname></term> | |
256 | <term><varname>udev.exec-delay=</varname></term> | |
257 | <term><varname>rd.udev.exec-delay=</varname></term> | |
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258 | <term><varname>udev.event-timeout=</varname></term> |
259 | <term><varname>rd.udev.event-timeout=</varname></term> | |
14228c0d | 260 | <term><varname>net.ifnames=</varname></term> |
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261 | |
262 | <listitem> | |
263 | <para>Parameters understood by | |
264 | the device event managing daemon. For | |
14228c0d | 265 | details, see |
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266 | <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> |
267 | </listitem> | |
268 | </varlistentry> | |
269 | ||
270 | <varlistentry> | |
271 | <term><varname>plymouth.enable=</varname></term> | |
272 | ||
273 | <listitem> | |
274 | <para>May be used to disable | |
275 | the Plymouth boot splash. For | |
14228c0d | 276 | details, see |
5eef597e | 277 | <citerefentry project='die-net'><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> |
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278 | </listitem> |
279 | </varlistentry> | |
280 | ||
281 | <varlistentry> | |
282 | <term><varname>luks=</varname></term> | |
283 | <term><varname>rd.luks=</varname></term> | |
284 | <term><varname>luks.crypttab=</varname></term> | |
285 | <term><varname>rd.luks.crypttab=</varname></term> | |
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286 | <term><varname>luks.name=</varname></term> |
287 | <term><varname>rd.luks.name=</varname></term> | |
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288 | <term><varname>luks.uuid=</varname></term> |
289 | <term><varname>rd.luks.uuid=</varname></term> | |
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290 | <term><varname>luks.options=</varname></term> |
291 | <term><varname>rd.luks.options=</varname></term> | |
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292 | <term><varname>luks.key=</varname></term> |
293 | <term><varname>rd.luks.key=</varname></term> | |
294 | ||
295 | <listitem> | |
296 | <para>Configures the LUKS | |
297 | full-disk encryption logic at | |
14228c0d | 298 | boot. For details, see |
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299 | <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> |
300 | </listitem> | |
301 | </varlistentry> | |
302 | ||
303 | <varlistentry> | |
304 | <term><varname>fstab=</varname></term> | |
305 | <term><varname>rd.fstab=</varname></term> | |
306 | ||
307 | <listitem> | |
308 | <para>Configures the | |
309 | <filename>/etc/fstab</filename> | |
14228c0d | 310 | logic at boot. For details, see |
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311 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> |
312 | </listitem> | |
313 | </varlistentry> | |
314 | ||
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315 | <varlistentry> |
316 | <term><varname>root=</varname></term> | |
317 | <term><varname>rootfstype=</varname></term> | |
318 | <term><varname>rootfsflags=</varname></term> | |
319 | <term><varname>ro</varname></term> | |
320 | <term><varname>rw</varname></term> | |
321 | ||
322 | <listitem> | |
323 | <para>Configures the root file | |
324 | system and its file system | |
325 | type and mount options, as | |
326 | well as whether it shall be | |
327 | mounted read-only or | |
328 | read-writable initially. For | |
329 | details, see | |
330 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
331 | </listitem> | |
332 | </varlistentry> | |
333 | ||
334 | <varlistentry> | |
335 | <term><varname>systemd.gpt_auto=</varname></term> | |
336 | <term><varname>rd.systemd.gpt_auto=</varname></term> | |
337 | ||
338 | <listitem> | |
339 | <para>Configures whether GPT | |
340 | based partition auto-discovery | |
341 | shall be attempted. For | |
342 | details, see | |
343 | <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
344 | </listitem> | |
345 | </varlistentry> | |
346 | ||
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347 | <varlistentry> |
348 | <term><varname>modules-load=</varname></term> | |
349 | <term><varname>rd.modules-load=</varname></term> | |
350 | ||
351 | <listitem> | |
352 | <para>Load a specific kernel | |
353 | module early at boot. For | |
14228c0d | 354 | details, see |
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355 | <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> |
356 | </listitem> | |
357 | </varlistentry> | |
358 | ||
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359 | <varlistentry> |
360 | <term><varname>resume=</varname></term> | |
361 | ||
362 | <listitem> | |
363 | <para>Enables resume from hibernation | |
364 | using the specified device. | |
365 | All <citerefentry><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>-like | |
366 | paths are supported. For details, see | |
367 | <citerefentry><refentrytitle>systemd-hibernate-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
368 | </listitem> | |
369 | </varlistentry> | |
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370 | </variablelist> |
371 | ||
372 | </refsect1> | |
373 | ||
374 | <refsect1> | |
375 | <title>See Also</title> | |
376 | <para> | |
377 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
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378 | <citerefentry project='man-pages'><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>, |
379 | <citerefentry project='die-net'><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>, | |
e842803a | 380 | <citerefentry><refentrytitle>systemd-debug-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
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381 | <citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
382 | <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
383 | <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
384 | <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
385 | <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
5eef597e | 386 | <citerefentry project='die-net'><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
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387 | <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
388 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
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389 | <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
390 | <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
391 | <citerefentry><refentrytitle>systemd-backlight@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
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392 | <citerefentry><refentrytitle>systemd-rfkill@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
393 | <citerefentry><refentrytitle>systemd-hibernate-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
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394 | </para> |
395 | </refsect1> | |
396 | ||
397 | </refentry> |