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c66e7bc7 | 1 | <?xml version='1.0'?> <!--*-nxml-*--> |
3a54a157 | 2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" |
eea10b26 | 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd"> |
db9ecf05 | 4 | <!-- SPDX-License-Identifier: LGPL-2.1-or-later --> |
c66e7bc7 | 5 | |
4623eecb | 6 | <refentry id="kernel-command-line" xmlns:xi="http://www.w3.org/2001/XInclude"> |
c66e7bc7 | 7 | |
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8 | <refentryinfo> |
9 | <title>kernel-command-line</title> | |
10 | <productname>systemd</productname> | |
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11 | </refentryinfo> |
12 | ||
13 | <refmeta> | |
14 | <refentrytitle>kernel-command-line</refentrytitle> | |
15 | <manvolnum>7</manvolnum> | |
16 | </refmeta> | |
17 | ||
18 | <refnamediv> | |
19 | <refname>kernel-command-line</refname> | |
20 | <refpurpose>Kernel command line parameters</refpurpose> | |
21 | </refnamediv> | |
22 | ||
23 | <refsynopsisdiv> | |
24 | <para><filename>/proc/cmdline</filename></para> | |
25 | </refsynopsisdiv> | |
26 | ||
27 | <refsect1> | |
28 | <title>Description</title> | |
29 | ||
b66a6e1a ZJS |
30 | <para>The kernel, the programs running in the initrd and in the host system may be configured at boot via |
31 | kernel command line arguments. In addition, various systemd tools look at the EFI variable | |
28f0aef4 ZJS |
32 | <literal>SystemdOptions</literal> (if available). Both sources are combined, but the kernel command line |
33 | has higher priority. Please note that <emphasis>the EFI variable is only used by systemd tools, and is | |
34 | ignored by the kernel and other user space tools</emphasis>, so it is not a replacement for the kernel | |
35 | command line.</para> | |
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36 | |
37 | <para>For command line parameters understood by the kernel, please | |
ab1f7245 | 38 | see |
0e685823 | 39 | <ulink url="https://docs.kernel.org/admin-guide/kernel-parameters.html"><filename>kernel-parameters.html</filename></ulink> |
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40 | and |
41 | <citerefentry project='man-pages'><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para> | |
42 | ||
98118c44 DDM |
43 | <para>For command line parameters understood by the initrd, see the documentation of the specific initrd |
44 | implementation of your installation.</para> | |
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45 | </refsect1> |
46 | ||
47 | <refsect1> | |
48 | <title>Core OS Command Line Arguments</title> | |
49 | ||
50 | <variablelist class='kernel-commandline-options'> | |
51 | <varlistentry> | |
52 | <term><varname>systemd.unit=</varname></term> | |
53 | <term><varname>rd.systemd.unit=</varname></term> | |
770c4777 ZJS |
54 | <term><varname>systemd.dump_core</varname></term> |
55 | <term><varname>systemd.crash_chvt</varname></term> | |
56 | <term><varname>systemd.crash_shell</varname></term> | |
57 | <term><varname>systemd.crash_reboot</varname></term> | |
58 | <term><varname>systemd.confirm_spawn</varname></term> | |
2a12e32e | 59 | <term><varname>systemd.service_watchdogs</varname></term> |
770c4777 | 60 | <term><varname>systemd.show_status</varname></term> |
36cf4507 | 61 | <term><varname>systemd.status_unit_format=</varname></term> |
798d3a52 ZJS |
62 | <term><varname>systemd.log_target=</varname></term> |
63 | <term><varname>systemd.log_level=</varname></term> | |
798d3a52 | 64 | <term><varname>systemd.log_location=</varname></term> |
770c4777 | 65 | <term><varname>systemd.log_color</varname></term> |
8750a06b | 66 | <term><varname>systemd.log_ratelimit_kmsg</varname></term> |
798d3a52 ZJS |
67 | <term><varname>systemd.default_standard_output=</varname></term> |
68 | <term><varname>systemd.default_standard_error=</varname></term> | |
69 | <term><varname>systemd.setenv=</varname></term> | |
ee48dbd5 | 70 | <term><varname>systemd.machine_id=</varname></term> |
72267a55 | 71 | <term><varname>systemd.set_credential=</varname></term> |
de70ecb3 | 72 | <term><varname>systemd.set_credential_binary=</varname></term> |
72267a55 | 73 | <term><varname>systemd.import_credentials=</varname></term> |
856bfaeb LB |
74 | <term><varname>systemd.reload_limit_interval_sec=</varname></term> |
75 | <term><varname>systemd.reload_limit_burst=</varname></term> | |
798d3a52 ZJS |
76 | <listitem> |
77 | <para>Parameters understood by the system and service | |
78 | manager to control system behavior. For details, see | |
79 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
aefdc112 AK |
80 | |
81 | <xi:include href="version-info.xml" xpointer="v186"/> | |
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82 | </listitem> |
83 | </varlistentry> | |
84 | ||
85 | <varlistentry> | |
86 | <term><varname>systemd.mask=</varname></term> | |
87 | <term><varname>systemd.wants=</varname></term> | |
1d84ad94 | 88 | <term><varname>systemd.debug_shell</varname></term> |
7bf52f5d | 89 | <term><varname>systemd.default_debug_tty=</varname></term> |
798d3a52 ZJS |
90 | <listitem> |
91 | <para>Additional parameters understood by | |
92 | <citerefentry><refentrytitle>systemd-debug-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
93 | to mask or start specific units at boot, or invoke a debug | |
94 | shell on tty9.</para> | |
aefdc112 AK |
95 | |
96 | <xi:include href="version-info.xml" xpointer="v215"/> | |
798d3a52 ZJS |
97 | </listitem> |
98 | </varlistentry> | |
99 | ||
565f3d91 LP |
100 | <varlistentry> |
101 | <term><varname>systemd.run=</varname></term> | |
102 | <term><varname>systemd.run_success_action=</varname></term> | |
103 | <term><varname>systemd.run_failure_action=</varname></term> | |
104 | <listitem> | |
105 | <para>Additional parameters understood by | |
106 | <citerefentry><refentrytitle>systemd-run-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, to | |
107 | run a command line specified on the kernel command line as system service after booting up.</para> | |
ec07c3c8 AK |
108 | |
109 | <xi:include href="version-info.xml" xpointer="v240"/> | |
565f3d91 LP |
110 | </listitem> |
111 | </varlistentry> | |
112 | ||
c6885f5f FB |
113 | <varlistentry> |
114 | <term><varname>systemd.early_core_pattern=</varname></term> | |
115 | <listitem> | |
116 | <para>During early boot, the generation of core dump files is disabled until a core dump handler (if any) | |
11fcfc53 | 117 | takes over. This parameter allows specifying an absolute path where core dump files should be stored until |
c6885f5f | 118 | a handler is installed. The path should be absolute and may contain specifiers, see |
b7a47345 | 119 | <citerefentry project='man-pages'><refentrytitle>core</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details.</para> |
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120 | |
121 | <xi:include href="version-info.xml" xpointer="v240"/> | |
c6885f5f FB |
122 | </listitem> |
123 | </varlistentry> | |
124 | ||
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125 | <varlistentry> |
126 | <term><varname>systemd.restore_state=</varname></term> | |
127 | <listitem> | |
128 | <para>This parameter is understood by several system tools | |
129 | to control whether or not they should restore system state | |
130 | from the previous boot. For details, see | |
131 | <citerefentry><refentrytitle>systemd-backlight@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
132 | and | |
af105d03 | 133 | <citerefentry><refentrytitle>systemd-rfkill.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>. |
798d3a52 | 134 | </para> |
ec07c3c8 AK |
135 | |
136 | <xi:include href="version-info.xml" xpointer="v209"/> | |
798d3a52 ZJS |
137 | </listitem> |
138 | </varlistentry> | |
139 | ||
0e322068 LP |
140 | <varlistentry> |
141 | <term><varname>systemd.ssh_auto=</varname></term> | |
142 | <term><varname>systemd.ssh_listen=</varname></term> | |
143 | <listitem> | |
144 | <para>These parameters are interpreted by | |
145 | <citerefentry><refentrytitle>systemd-ssh-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
146 | and may be used to control SSH sockets the system shall be reachable on.</para> | |
147 | ||
148 | <xi:include href="version-info.xml" xpointer="v256"/> | |
149 | </listitem> | |
150 | </varlistentry> | |
151 | ||
91214a37 LP |
152 | <varlistentry> |
153 | <term><varname>systemd.volatile=</varname></term> | |
154 | <listitem> | |
155 | <para>This parameter controls whether the system shall boot up in volatile mode. Takes a boolean argument, or | |
156 | the special value <literal>state</literal>. If false (the default), normal boot mode is selected, the root | |
3b121157 | 157 | directory and <filename>/var/</filename> are mounted as specified on the kernel command line or |
91214a37 LP |
158 | <filename>/etc/fstab</filename>, or otherwise configured. If true, full state-less boot mode is selected. In |
159 | this case the root directory is mounted as volatile memory file system (<literal>tmpfs</literal>), and only | |
3b121157 | 160 | <filename>/usr/</filename> is mounted from the file system configured as root device, in read-only mode. This |
91214a37 | 161 | enables fully state-less boots were the vendor-supplied OS is used as shipped, with only default |
3b121157 | 162 | configuration and no stored state in effect, as <filename>/etc/</filename> and <filename>/var/</filename> (as |
91214a37 | 163 | well as all other resources shipped in the root file system) are reset at boot and lost on shutdown. If this |
13070a70 | 164 | setting is set to <literal>state</literal> the root file system is mounted read-only, however |
3b121157 | 165 | <filename>/var/</filename> is mounted as a volatile memory file system (<literal>tmpfs</literal>), so that the |
13070a70 LP |
166 | system boots up with the normal configuration applied, but all state reset at boot and lost at shutdown. If |
167 | this setting is set to <literal>overlay</literal> the root file system is set up as | |
168 | <literal>overlayfs</literal> mount combining the read-only root directory with a writable | |
169 | <literal>tmpfs</literal>, so that no modifications are made to disk, but the file system may be modified | |
170 | nonetheless with all changes being lost at reboot. For details, see | |
91214a37 LP |
171 | <citerefentry><refentrytitle>systemd-volatile-root.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> |
172 | and | |
173 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
ec07c3c8 AK |
174 | |
175 | <xi:include href="version-info.xml" xpointer="v233"/> | |
91214a37 LP |
176 | </listitem> |
177 | </varlistentry> | |
178 | ||
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179 | <varlistentry> |
180 | <term><varname>quiet</varname></term> | |
181 | <listitem> | |
182 | <para>Parameter understood by both the kernel and the system | |
183 | and service manager to control console log verbosity. For | |
184 | details, see | |
185 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
ec07c3c8 AK |
186 | |
187 | <xi:include href="version-info.xml" xpointer="v186"/> | |
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188 | </listitem> |
189 | </varlistentry> | |
190 | ||
191 | <varlistentry> | |
192 | <term><varname>debug</varname></term> | |
193 | <listitem> | |
194 | <para>Parameter understood by both the kernel and the system | |
195 | and service manager to control console log verbosity. For | |
196 | details, see | |
197 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
ec07c3c8 AK |
198 | |
199 | <xi:include href="version-info.xml" xpointer="v205"/> | |
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200 | </listitem> |
201 | </varlistentry> | |
202 | ||
203 | <varlistentry> | |
204 | <term><varname>-b</varname></term> | |
dcd61450 | 205 | <term><varname>rd.emergency</varname></term> |
798d3a52 | 206 | <term><varname>emergency</varname></term> |
dcd61450 | 207 | <term><varname>rd.rescue</varname></term> |
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208 | <term><varname>rescue</varname></term> |
209 | <term><varname>single</varname></term> | |
210 | <term><varname>s</varname></term> | |
211 | <term><varname>S</varname></term> | |
212 | <term><varname>1</varname></term> | |
213 | <term><varname>2</varname></term> | |
214 | <term><varname>3</varname></term> | |
215 | <term><varname>4</varname></term> | |
216 | <term><varname>5</varname></term> | |
217 | <listitem> | |
218 | <para>Parameters understood by the system and service | |
dcd61450 | 219 | manager, as compatibility and convenience options. For details, see |
798d3a52 | 220 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> |
aefdc112 AK |
221 | |
222 | <xi:include href="version-info.xml" xpointer="v186"/> | |
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223 | </listitem> |
224 | </varlistentry> | |
225 | ||
226 | <varlistentry> | |
227 | <term><varname>locale.LANG=</varname></term> | |
228 | <term><varname>locale.LANGUAGE=</varname></term> | |
229 | <term><varname>locale.LC_CTYPE=</varname></term> | |
230 | <term><varname>locale.LC_NUMERIC=</varname></term> | |
231 | <term><varname>locale.LC_TIME=</varname></term> | |
232 | <term><varname>locale.LC_COLLATE=</varname></term> | |
233 | <term><varname>locale.LC_MONETARY=</varname></term> | |
234 | <term><varname>locale.LC_MESSAGES=</varname></term> | |
235 | <term><varname>locale.LC_PAPER=</varname></term> | |
236 | <term><varname>locale.LC_NAME=</varname></term> | |
237 | <term><varname>locale.LC_ADDRESS=</varname></term> | |
238 | <term><varname>locale.LC_TELEPHONE=</varname></term> | |
239 | <term><varname>locale.LC_MEASUREMENT=</varname></term> | |
240 | <term><varname>locale.LC_IDENTIFICATION=</varname></term> | |
241 | <listitem> | |
242 | <para>Parameters understood by the system and service | |
243 | manager to control locale and language settings. For | |
244 | details, see | |
245 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
ec07c3c8 AK |
246 | |
247 | <xi:include href="version-info.xml" xpointer="v186"/> | |
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248 | </listitem> |
249 | </varlistentry> | |
250 | ||
251 | <varlistentry> | |
252 | <term><varname>fsck.mode=</varname></term> | |
253 | <term><varname>fsck.repair=</varname></term> | |
254 | ||
255 | <listitem> | |
256 | <para>Parameters understood by the file system checker | |
257 | services. For details, see | |
258 | <citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
aefdc112 AK |
259 | |
260 | <xi:include href="version-info.xml" xpointer="v186"/> | |
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261 | </listitem> |
262 | </varlistentry> | |
263 | ||
264 | <varlistentry> | |
265 | <term><varname>quotacheck.mode=</varname></term> | |
266 | ||
267 | <listitem> | |
268 | <para>Parameter understood by the file quota checker | |
269 | service. For details, see | |
270 | <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
ec07c3c8 AK |
271 | |
272 | <xi:include href="version-info.xml" xpointer="v186"/> | |
798d3a52 ZJS |
273 | </listitem> |
274 | </varlistentry> | |
275 | ||
276 | <varlistentry> | |
277 | <term><varname>systemd.journald.forward_to_syslog=</varname></term> | |
278 | <term><varname>systemd.journald.forward_to_kmsg=</varname></term> | |
279 | <term><varname>systemd.journald.forward_to_console=</varname></term> | |
280 | <term><varname>systemd.journald.forward_to_wall=</varname></term> | |
281 | ||
282 | <listitem> | |
283 | <para>Parameters understood by the journal service. For | |
284 | details, see | |
285 | <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
aefdc112 AK |
286 | |
287 | <xi:include href="version-info.xml" xpointer="v186"/> | |
798d3a52 ZJS |
288 | </listitem> |
289 | </varlistentry> | |
290 | ||
291 | <varlistentry> | |
292 | <term><varname>vconsole.keymap=</varname></term> | |
72ccee50 | 293 | <term><varname>vconsole.keymap_toggle=</varname></term> |
798d3a52 | 294 | <term><varname>vconsole.font=</varname></term> |
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295 | <term><varname>vconsole.font_map=</varname></term> |
296 | <term><varname>vconsole.font_unimap=</varname></term> | |
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297 | |
298 | <listitem> | |
72ccee50 ZJS |
299 | <para>Parameters understood by the virtual console setup logic. For details, see |
300 | <citerefentry><refentrytitle>vconsole.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> | |
aefdc112 AK |
301 | |
302 | <xi:include href="version-info.xml" xpointer="v186"/> | |
798d3a52 ZJS |
303 | </listitem> |
304 | </varlistentry> | |
305 | ||
306 | <varlistentry> | |
64a3494c FB |
307 | <term><varname>udev.log_level=</varname></term> |
308 | <term><varname>rd.udev.log_level=</varname></term> | |
1d84ad94 LP |
309 | <term><varname>udev.children_max=</varname></term> |
310 | <term><varname>rd.udev.children_max=</varname></term> | |
311 | <term><varname>udev.exec_delay=</varname></term> | |
312 | <term><varname>rd.udev.exec_delay=</varname></term> | |
313 | <term><varname>udev.event_timeout=</varname></term> | |
314 | <term><varname>rd.udev.event_timeout=</varname></term> | |
e2099267 MS |
315 | <term><varname>udev.timeout_signal=</varname></term> |
316 | <term><varname>rd.udev.timeout_signal=</varname></term> | |
95ac5230 LP |
317 | <term><varname>udev.blockdev_read_only</varname></term> |
318 | <term><varname>rd.udev.blockdev_read_only</varname></term> | |
798d3a52 | 319 | <term><varname>net.ifnames=</varname></term> |
78266a54 | 320 | <term><varname>net.naming_scheme=</varname></term> |
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321 | |
322 | <listitem> | |
323 | <para>Parameters understood by the device event managing | |
324 | daemon. For details, see | |
325 | <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
aefdc112 AK |
326 | |
327 | <xi:include href="version-info.xml" xpointer="v186"/> | |
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328 | </listitem> |
329 | </varlistentry> | |
330 | ||
331 | <varlistentry> | |
332 | <term><varname>plymouth.enable=</varname></term> | |
333 | ||
334 | <listitem> | |
335 | <para>May be used to disable the Plymouth boot splash. For | |
336 | details, see | |
337 | <citerefentry project='die-net'><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
ec07c3c8 AK |
338 | |
339 | <xi:include href="version-info.xml" xpointer="v186"/> | |
798d3a52 ZJS |
340 | </listitem> |
341 | </varlistentry> | |
342 | ||
343 | <varlistentry> | |
344 | <term><varname>luks=</varname></term> | |
345 | <term><varname>rd.luks=</varname></term> | |
346 | <term><varname>luks.crypttab=</varname></term> | |
347 | <term><varname>rd.luks.crypttab=</varname></term> | |
348 | <term><varname>luks.name=</varname></term> | |
349 | <term><varname>rd.luks.name=</varname></term> | |
350 | <term><varname>luks.uuid=</varname></term> | |
351 | <term><varname>rd.luks.uuid=</varname></term> | |
352 | <term><varname>luks.options=</varname></term> | |
353 | <term><varname>rd.luks.options=</varname></term> | |
354 | <term><varname>luks.key=</varname></term> | |
355 | <term><varname>rd.luks.key=</varname></term> | |
356 | ||
357 | <listitem> | |
358 | <para>Configures the LUKS full-disk encryption logic at | |
359 | boot. For details, see | |
360 | <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
aefdc112 AK |
361 | |
362 | <xi:include href="version-info.xml" xpointer="v186"/> | |
798d3a52 ZJS |
363 | </listitem> |
364 | </varlistentry> | |
365 | ||
366 | <varlistentry> | |
367 | <term><varname>fstab=</varname></term> | |
368 | <term><varname>rd.fstab=</varname></term> | |
369 | ||
370 | <listitem> | |
371 | <para>Configures the <filename>/etc/fstab</filename> logic | |
372 | at boot. For details, see | |
373 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
ec07c3c8 AK |
374 | |
375 | <xi:include href="version-info.xml" xpointer="v186"/> | |
798d3a52 ZJS |
376 | </listitem> |
377 | </varlistentry> | |
378 | ||
379 | <varlistentry> | |
380 | <term><varname>root=</varname></term> | |
381 | <term><varname>rootfstype=</varname></term> | |
d6a12e7c | 382 | <term><varname>rootflags=</varname></term> |
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383 | <term><varname>ro</varname></term> |
384 | <term><varname>rw</varname></term> | |
385 | ||
386 | <listitem> | |
cf451f38 LP |
387 | <para>Configures the root file system and its file system type and mount options, as well as |
388 | whether it shall be mounted read-only or read-write initially. For details, see | |
798d3a52 | 389 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> |
cf451f38 LP |
390 | |
391 | <para>If <varname>root=</varname> is not set (or set to <literal>gpt-auto</literal>) the automatic | |
392 | root partition discovery implemented by | |
393 | <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
394 | will be in effect. In this case <varname>rootfstype=</varname>, <varname>rootflags=</varname>, | |
395 | <varname>ro</varname>, <varname>rw</varname> will be interpreted by | |
396 | <command>systemd-gpt-auto-generator</command>.</para> | |
aefdc112 AK |
397 | |
398 | <xi:include href="version-info.xml" xpointer="v215"/> | |
798d3a52 ZJS |
399 | </listitem> |
400 | </varlistentry> | |
401 | ||
6dfcea32 TH |
402 | <varlistentry> |
403 | <term><varname>mount.usr=</varname></term> | |
404 | <term><varname>mount.usrfstype=</varname></term> | |
405 | <term><varname>mount.usrflags=</varname></term> | |
406 | ||
407 | <listitem> | |
408 | <para>Configures the /usr file system (if required) and | |
409 | its file system type and mount options. For details, see | |
410 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
ec07c3c8 AK |
411 | |
412 | <xi:include href="version-info.xml" xpointer="v235"/> | |
6dfcea32 TH |
413 | </listitem> |
414 | </varlistentry> | |
415 | ||
2f3dfc6f | 416 | <varlistentry> |
08b04ec7 GP |
417 | <term><varname>veritytab=</varname></term> |
418 | <term><varname>rd.veritytab=</varname></term> | |
2f3dfc6f LP |
419 | <term><varname>roothash=</varname></term> |
420 | <term><varname>systemd.verity=</varname></term> | |
421 | <term><varname>rd.systemd.verity=</varname></term> | |
422 | <term><varname>systemd.verity_root_data=</varname></term> | |
423 | <term><varname>systemd.verity_root_hash=</varname></term> | |
0141102f | 424 | <term><varname>systemd.verity.root_options=</varname></term> |
e5196eee MB |
425 | <term><varname>usrhash=</varname></term> |
426 | <term><varname>systemd.verity_usr_data=</varname></term> | |
427 | <term><varname>systemd.verity_usr_hash=</varname></term> | |
428 | <term><varname>systemd.verity_usr_options=</varname></term> | |
2f3dfc6f | 429 | <listitem> |
e5196eee | 430 | <para>Configures the integrity protection root hash for the root and <filename>/usr</filename> file systems, and other related |
2f3dfc6f LP |
431 | parameters. For details, see |
432 | <citerefentry><refentrytitle>systemd-veritysetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
aefdc112 AK |
433 | |
434 | <xi:include href="version-info.xml" xpointer="v233"/> | |
2f3dfc6f LP |
435 | </listitem> |
436 | </varlistentry> | |
437 | ||
21d00e52 LB |
438 | <varlistentry> |
439 | <term><varname>systemd.getty_auto=</varname></term> | |
440 | ||
441 | <listitem> | |
442 | <para>Configures whether the <filename>serial-getty@.service</filename> will run. | |
443 | For details, see | |
444 | <citerefentry><refentrytitle>systemd-getty-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
ec07c3c8 AK |
445 | |
446 | <xi:include href="version-info.xml" xpointer="v250"/> | |
21d00e52 LB |
447 | </listitem> |
448 | </varlistentry> | |
449 | ||
798d3a52 ZJS |
450 | <varlistentry> |
451 | <term><varname>systemd.gpt_auto=</varname></term> | |
452 | <term><varname>rd.systemd.gpt_auto=</varname></term> | |
453 | ||
454 | <listitem> | |
9ea81191 | 455 | <para>Configures whether GPT-based partition auto-discovery shall be attempted. For details, see |
798d3a52 | 456 | <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> |
ec07c3c8 AK |
457 | |
458 | <xi:include href="version-info.xml" xpointer="v215"/> | |
798d3a52 ZJS |
459 | </listitem> |
460 | </varlistentry> | |
461 | ||
9ea81191 LP |
462 | <varlistentry> |
463 | <term><varname>systemd.image_policy=</varname></term> | |
464 | <term><varname>rd.systemd.image_policy=</varname></term> | |
465 | ||
466 | <listitem><para>When GPT-based partition auto-discovery is used, configures the image dissection | |
467 | policy string to apply, as per | |
468 | <citerefentry><refentrytitle>systemd.image-policy</refentrytitle><manvolnum>7</manvolnum></citerefentry>. For | |
469 | details see | |
ec07c3c8 AK |
470 | <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> |
471 | ||
472 | <xi:include href="version-info.xml" xpointer="v254"/></listitem> | |
9ea81191 LP |
473 | </varlistentry> |
474 | ||
959718c6 TB |
475 | <varlistentry> |
476 | <term><varname>systemd.default_timeout_start_sec=</varname></term> | |
477 | ||
478 | <listitem> | |
ba669952 | 479 | <para>Overrides the default start job timeout <varname>DefaultTimeoutStartSec=</varname> at |
9c5ea4b1 LP |
480 | boot. For details, see |
481 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> | |
ec07c3c8 AK |
482 | |
483 | <xi:include href="version-info.xml" xpointer="v230"/> | |
c75396c3 EJ |
484 | </listitem> |
485 | </varlistentry> | |
486 | ||
6b818cd7 DDM |
487 | <varlistentry> |
488 | <term><varname>systemd.default_device_timeout_sec=</varname></term> | |
489 | ||
490 | <listitem> | |
491 | <para>Overrides the default device timeout <varname>DefaultDeviceTimeoutSec=</varname> at boot. For | |
492 | details, see | |
493 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> | |
ec07c3c8 AK |
494 | |
495 | <xi:include href="version-info.xml" xpointer="v254"/> | |
6b818cd7 DDM |
496 | </listitem> |
497 | </varlistentry> | |
498 | ||
c75396c3 EJ |
499 | <varlistentry> |
500 | <term><varname>systemd.watchdog_device=</varname></term> | |
501 | ||
502 | <listitem> | |
ba669952 | 503 | <para>Overrides the watchdog device path <varname>WatchdogDevice=</varname>. For details, see |
9c5ea4b1 | 504 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> |
ec07c3c8 AK |
505 | |
506 | <xi:include href="version-info.xml" xpointer="v236"/> | |
9c5ea4b1 LP |
507 | </listitem> |
508 | </varlistentry> | |
509 | ||
510 | <varlistentry> | |
511 | <term><varname>systemd.watchdog_sec=</varname></term> | |
512 | ||
513 | <listitem> | |
ba669952 | 514 | <para>Overrides the watchdog timeout settings otherwise configured with |
9c5ea4b1 LP |
515 | <varname>RuntimeWatchdog=</varname>, <varname>RebootWatchdog=</varname> and |
516 | <varname>KExecWatchdogSec=</varname>. Takes a time value (if no unit is specified, seconds is the | |
517 | implicitly assumed time unit) or the special strings <literal>off</literal> or | |
518 | <literal>default</literal>. For details, see | |
c75396c3 | 519 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> |
ec07c3c8 AK |
520 | |
521 | <xi:include href="version-info.xml" xpointer="v250"/> | |
959718c6 TB |
522 | </listitem> |
523 | </varlistentry> | |
524 | ||
5717062e CK |
525 | <varlistentry> |
526 | <term><varname>systemd.watchdog_pre_sec=</varname></term> | |
527 | ||
528 | <listitem> | |
529 | <para>Overrides the watchdog pre-timeout settings otherwise configured with | |
530 | <varname>RuntimeWatchdogPreSec=</varname>. Takes a time value (if no unit is specified, seconds is the | |
531 | implicitly assumed time unit) or the special strings <literal>off</literal> or | |
532 | <literal>default</literal>. For details, see | |
533 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> | |
ec07c3c8 AK |
534 | |
535 | <xi:include href="version-info.xml" xpointer="v251"/> | |
5717062e CK |
536 | </listitem> |
537 | </varlistentry> | |
538 | ||
aff3a9e1 LB |
539 | <varlistentry> |
540 | <term><varname>systemd.watchdog_pretimeout_governor=</varname></term> | |
541 | ||
542 | <listitem> | |
543 | <para>Overrides the watchdog pre-timeout settings otherwise configured with | |
544 | <varname>RuntimeWatchdogPreGovernor=</varname>. Takes a string value. For details, see | |
545 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> | |
ec07c3c8 AK |
546 | |
547 | <xi:include href="version-info.xml" xpointer="v251"/> | |
aff3a9e1 LB |
548 | </listitem> |
549 | </varlistentry> | |
550 | ||
68d58f38 LP |
551 | <varlistentry> |
552 | <term><varname>systemd.cpu_affinity=</varname></term> | |
553 | ||
554 | <listitem> | |
555 | <para>Overrides the CPU affinity mask for the service manager and the default for all child | |
556 | processes it forks. This takes precedence over <varname>CPUAffinity=</varname>, see | |
557 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
558 | for details.</para> | |
ec07c3c8 AK |
559 | |
560 | <xi:include href="version-info.xml" xpointer="v245"/> | |
68d58f38 LP |
561 | </listitem> |
562 | </varlistentry> | |
563 | ||
798d3a52 | 564 | <varlistentry> |
1d84ad94 LP |
565 | <term><varname>modules_load=</varname></term> |
566 | <term><varname>rd.modules_load=</varname></term> | |
798d3a52 ZJS |
567 | |
568 | <listitem> | |
569 | <para>Load a specific kernel module early at boot. For | |
570 | details, see | |
571 | <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
ec07c3c8 | 572 | |
aefdc112 | 573 | <xi:include href="version-info.xml" xpointer="v187"/> |
798d3a52 ZJS |
574 | </listitem> |
575 | </varlistentry> | |
576 | ||
116687f2 LP |
577 | <varlistentry> |
578 | <term><varname>nameserver=</varname></term> | |
579 | <term><varname>domain=</varname></term> | |
580 | ||
581 | <listitem><para>Configures DNS server information and search domains, see | |
582 | <citerefentry><refentrytitle>systemd-resolved.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
ec07c3c8 AK |
583 | for details.</para> |
584 | ||
585 | <xi:include href="version-info.xml" xpointer="v253"/></listitem> | |
116687f2 LP |
586 | </varlistentry> |
587 | ||
798d3a52 ZJS |
588 | <varlistentry> |
589 | <term><varname>resume=</varname></term> | |
8b6805a2 | 590 | <term><varname>resumeflags=</varname></term> |
798d3a52 ZJS |
591 | |
592 | <listitem> | |
593 | <para>Enables resume from hibernation using the specified | |
8b6805a2 | 594 | device and mount options. All |
3ba3a79d | 595 | <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>-like |
798d3a52 ZJS |
596 | paths are supported. For details, see |
597 | <citerefentry><refentrytitle>systemd-hibernate-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
aefdc112 AK |
598 | |
599 | <xi:include href="version-info.xml" xpointer="v217"/> | |
798d3a52 ZJS |
600 | </listitem> |
601 | </varlistentry> | |
f582cbca LP |
602 | |
603 | <varlistentry> | |
604 | <term><varname>systemd.firstboot=</varname></term> | |
605 | ||
606 | <listitem><para>Takes a boolean argument, defaults to on. If off, | |
607 | <citerefentry><refentrytitle>systemd-firstboot.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
3ccadbce LP |
608 | and |
609 | <citerefentry><refentrytitle>systemd-homed-firstboot.service</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
814872e9 LP |
610 | will not query the user for basic system settings, even if the system boots up for the first time and |
611 | the relevant settings are not initialized yet. Not to be confused with | |
78266a54 | 612 | <varname>systemd.condition_first_boot=</varname> (see below), which overrides the result of the |
814872e9 | 613 | <varname>ConditionFirstBoot=</varname> unit file condition, and thus controls more than just |
ec07c3c8 AK |
614 | <filename>systemd-firstboot.service</filename> behaviour.</para> |
615 | ||
616 | <xi:include href="version-info.xml" xpointer="v233"/></listitem> | |
f582cbca | 617 | </varlistentry> |
f8b4ae29 LP |
618 | |
619 | <varlistentry> | |
78266a54 | 620 | <term><varname>systemd.condition_needs_update=</varname></term> |
f8b4ae29 LP |
621 | |
622 | <listitem><para>Takes a boolean argument. If specified, overrides the result of | |
623 | <varname>ConditionNeedsUpdate=</varname> unit condition checks. See | |
624 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for | |
ec07c3c8 AK |
625 | details.</para> |
626 | ||
627 | <xi:include href="version-info.xml" xpointer="v246"/></listitem> | |
f8b4ae29 | 628 | </varlistentry> |
814872e9 LP |
629 | |
630 | <varlistentry> | |
78266a54 | 631 | <term><varname>systemd.condition_first_boot=</varname></term> |
814872e9 LP |
632 | |
633 | <listitem><para>Takes a boolean argument. If specified, overrides the result of | |
634 | <varname>ConditionFirstBoot=</varname> unit condition checks. See | |
635 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for | |
636 | details. Not to be confused with <varname>systemd.firstboot=</varname> which only controls behaviour | |
637 | of the <filename>systemd-firstboot.service</filename> system service but has no effect on the | |
ec07c3c8 AK |
638 | condition check (see above).</para> |
639 | ||
640 | <xi:include href="version-info.xml" xpointer="v246"/></listitem> | |
814872e9 | 641 | </varlistentry> |
3753325b LP |
642 | |
643 | <varlistentry> | |
78266a54 | 644 | <term><varname>systemd.clock_usec=</varname></term> |
3753325b | 645 | |
e503019b | 646 | <listitem><para>Takes a decimal, numeric timestamp in μs since January 1st 1970, 00:00am, to set the |
18d9cee0 | 647 | system clock to. The system time is set to the specified timestamp early during boot. It is not |
ec07c3c8 AK |
648 | propagated to the hardware clock (RTC).</para> |
649 | ||
650 | <xi:include href="version-info.xml" xpointer="v246"/></listitem> | |
18d9cee0 LP |
651 | </varlistentry> |
652 | ||
653 | <varlistentry> | |
78266a54 | 654 | <term><varname>systemd.random_seed=</varname></term> |
18d9cee0 LP |
655 | |
656 | <listitem><para>Takes a base64 encoded random seed value to credit with full entropy to the kernel's | |
657 | random pool during early service manager initialization. This option is useful in testing | |
658 | environments where delays due to random pool initialization in entropy starved virtual machines shall | |
659 | be avoided.</para> | |
660 | ||
661 | <para>Note that if this option is used the seed is accessible to unprivileged programs from | |
662 | <filename>/proc/cmdline</filename>. This option is hence a security risk when used outside of test | |
663 | systems, since the (possibly) only seed used for initialization of the kernel's entropy pool might be | |
664 | easily acquired by unprivileged programs.</para> | |
665 | ||
666 | <para>It is recommended to pass 512 bytes of randomized data (as that matches the Linux kernel pool | |
667 | size), which may be generated with a command like the following:</para> | |
668 | ||
669 | <programlisting>dd if=/dev/urandom bs=512 count=1 status=none | base64 -w 0</programlisting> | |
670 | ||
671 | <para>Again: do not use this option outside of testing environments, it's a security risk elsewhere, | |
672 | as secret key material derived from the entropy pool can possibly be reconstructed by unprivileged | |
673 | programs.</para> | |
ec07c3c8 AK |
674 | |
675 | <xi:include href="version-info.xml" xpointer="v246"/> | |
18d9cee0 | 676 | </listitem> |
3753325b | 677 | </varlistentry> |
34293dfa | 678 | |
f0ecff85 LP |
679 | <varlistentry> |
680 | <term><varname>systemd.allow_userspace_verity=</varname></term> | |
681 | ||
682 | <listitem><para>Takes a boolean argument. Controls whether disk images that are Verity protected may | |
683 | be authenticated in userspace signature checks via <filename>/etc/verity.d/</filename> (and related | |
684 | directories) public key drop-ins, or whether in-kernel signature checking only. Defaults to | |
685 | on.</para> | |
686 | ||
687 | <xi:include href="version-info.xml" xpointer="v256"/></listitem> | |
688 | </varlistentry> | |
689 | ||
34293dfa LP |
690 | <varlistentry> |
691 | <term><varname>systemd.hostname=</varname></term> | |
692 | ||
693 | <listitem><para>Accepts a hostname to set during early boot. If specified takes precedence over what | |
694 | is set in <filename>/etc/hostname</filename>. Note that this does not bar later runtime changes to | |
ec07c3c8 AK |
695 | the hostname, it simply controls the initial hostname set during early boot.</para> |
696 | ||
697 | <xi:include href="version-info.xml" xpointer="v246"/></listitem> | |
34293dfa | 698 | </varlistentry> |
4d62ee55 DDM |
699 | |
700 | <varlistentry> | |
701 | <term><varname>systemd.tty.term.<replaceable>tty</replaceable>=</varname></term> | |
702 | <term><varname>systemd.tty.rows.<replaceable>tty</replaceable>=</varname></term> | |
703 | <term><varname>systemd.tty.columns.<replaceable>tty</replaceable>=</varname></term> | |
704 | ||
705 | <listitem><para>These arguments allow configuring default values for <varname>$TERM</varname>, | |
706 | <varname>TTYRows=</varname>, and <varname>TTYColumns=</varname> for tty | |
153d5dfd DDM |
707 | <replaceable>tty</replaceable>. Additionally, <varname>systemd.tty.term.console</varname> will |
708 | configure the <varname>$TERM</varname> value used by <command>systemd</command> if not set explicitly | |
709 | using <varname>TERM</varname> on the kernel command line. The tty name should be specified without | |
710 | the <filename>/dev/</filename> prefix (e.g. <literal>systemd.tty.rows.ttyS0=80</literal>). | |
ec07c3c8 AK |
711 | </para> |
712 | ||
713 | <xi:include href="version-info.xml" xpointer="v254"/></listitem> | |
4d62ee55 | 714 | </varlistentry> |
dc9a56d8 LP |
715 | |
716 | <varlistentry> | |
717 | <term><varname>systemd.battery_check=</varname></term> | |
718 | ||
719 | <listitem><para>Accepts a boolean argument. If false the boot-time battery charge check implemented | |
720 | by | |
721 | <citerefentry><refentrytitle>systemd-battery-check.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
722 | is disabled.</para> | |
723 | ||
724 | <xi:include href="version-info.xml" xpointer="v254"/></listitem> | |
725 | </varlistentry> | |
726 | ||
727 | <varlistentry> | |
728 | <term><varname>ifname=</varname></term> | |
729 | <term><varname>net.ifname_policy=</varname></term> | |
730 | ||
731 | <listitem><para>Controls interface naming policies, implemented by | |
732 | <citerefentry><refentrytitle>systemd-network-generator.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
733 | ||
734 | <xi:include href="version-info.xml" xpointer="v245"/></listitem> | |
735 | </varlistentry> | |
736 | ||
737 | <varlistentry> | |
738 | <term><varname>systemd.tpm2_wait=</varname></term> | |
739 | ||
740 | <listitem><para>Controls whether to wait for a TPM2 device at boot, implemented by | |
741 | <citerefentry><refentrytitle>systemd-tpm2-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
742 | ||
743 | <xi:include href="version-info.xml" xpointer="v256"/></listitem> | |
744 | </varlistentry> | |
745 | ||
798d3a52 | 746 | </variablelist> |
7a9e0bd0 | 747 | </refsect1> |
798d3a52 | 748 | |
7a9e0bd0 ZJS |
749 | <refsect1> |
750 | <title>History</title> | |
751 | ||
752 | <variablelist> | |
753 | <varlistentry> | |
754 | <term>systemd 252</term> | |
755 | <listitem><para>Kernel command-line arguments <varname>systemd.unified_cgroup_hierarchy</varname> | |
756 | and <varname>systemd.legacy_systemd_cgroup_controller</varname> were deprecated. Please switch to | |
ec07c3c8 AK |
757 | the unified cgroup hierarchy.</para> |
758 | ||
759 | <xi:include href="version-info.xml" xpointer="v252"/></listitem> | |
7a9e0bd0 ZJS |
760 | </varlistentry> |
761 | </variablelist> | |
798d3a52 ZJS |
762 | </refsect1> |
763 | ||
764 | <refsect1> | |
765 | <title>See Also</title> | |
13a69c12 DT |
766 | <para><simplelist type="inline"> |
767 | <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member> | |
768 | <member><citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry></member> | |
769 | <member><citerefentry project='man-pages'><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry></member> | |
770 | <member><citerefentry><refentrytitle>systemd.system-credentials</refentrytitle><manvolnum>7</manvolnum></citerefentry></member> | |
771 | <member><citerefentry><refentrytitle>smbios-type-11</refentrytitle><manvolnum>7</manvolnum></citerefentry></member> | |
13a69c12 DT |
772 | <member><citerefentry><refentrytitle>systemd-debug-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> |
773 | <member><citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
774 | <member><citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
775 | <member><citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
776 | <member><citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
777 | <member><citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
778 | <member><citerefentry project='die-net'><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
779 | <member><citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
780 | <member><citerefentry><refentrytitle>systemd-veritysetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
781 | <member><citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
782 | <member><citerefentry><refentrytitle>systemd-getty-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
783 | <member><citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
784 | <member><citerefentry><refentrytitle>systemd-volatile-root.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
785 | <member><citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
786 | <member><citerefentry><refentrytitle>systemd-backlight@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
787 | <member><citerefentry><refentrytitle>systemd-rfkill.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
788 | <member><citerefentry><refentrytitle>systemd-hibernate-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
789 | <member><citerefentry><refentrytitle>systemd-firstboot.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member> | |
790 | <member><citerefentry><refentrytitle>bootctl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member> | |
791 | </simplelist></para> | |
798d3a52 | 792 | </refsect1> |
c66e7bc7 LP |
793 | |
794 | </refentry> |