projects / thirdparty / systemd.git / blame
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|---|---|---|
| c66e7bc7 | 1 | <?xml version='1.0'?> <!--*-nxml-*--> |
| 3a54a157 | 2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" |
| 12b42c76 | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
| db9ecf05 | 4 | <!-- SPDX-License-Identifier: LGPL-2.1-or-later --> |
| c66e7bc7 LP |
5 | |
| 6 | <refentry id="kernel-command-line"> | |
| 7 | ||
| 798d3a52 ZJS |
8 | <refentryinfo> |
| 9 | <title>kernel-command-line</title> | |
| 10 | <productname>systemd</productname> | |
| 798d3a52 ZJS |
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> | |
| 798d3a52 ZJS |
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> |
| 798d3a52 ZJS |
40 | and |
| 41 | <citerefentry project='man-pages'><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para> | |
| 42 | ||
| b66a6e1a | 43 | <para>For command line parameters understood by the initrd, see |
| af105d03 | 44 | <citerefentry project='man-pages'><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>, |
| 798d3a52 ZJS |
45 | or the documentation of the specific initrd implementation of your |
| 46 | installation.</para> | |
| 47 | </refsect1> | |
| 48 | ||
| 49 | <refsect1> | |
| 50 | <title>Core OS Command Line Arguments</title> | |
| 51 | ||
| 52 | <variablelist class='kernel-commandline-options'> | |
| 53 | <varlistentry> | |
| 54 | <term><varname>systemd.unit=</varname></term> | |
| 55 | <term><varname>rd.systemd.unit=</varname></term> | |
| 770c4777 | 56 | <term><varname>systemd.dump_core</varname></term> |
| c6885f5f | 57 | <term><varname>systemd.early_core_pattern=</varname></term> |
| 770c4777 ZJS |
58 | <term><varname>systemd.crash_chvt</varname></term> |
| 59 | <term><varname>systemd.crash_shell</varname></term> | |
| 60 | <term><varname>systemd.crash_reboot</varname></term> | |
| 61 | <term><varname>systemd.confirm_spawn</varname></term> | |
| 2a12e32e | 62 | <term><varname>systemd.service_watchdogs</varname></term> |
| 770c4777 | 63 | <term><varname>systemd.show_status</varname></term> |
| 36cf4507 | 64 | <term><varname>systemd.status_unit_format=</varname></term> |
| 798d3a52 ZJS |
65 | <term><varname>systemd.log_target=</varname></term> |
| 66 | <term><varname>systemd.log_level=</varname></term> | |
| 798d3a52 | 67 | <term><varname>systemd.log_location=</varname></term> |
| 770c4777 | 68 | <term><varname>systemd.log_color</varname></term> |
| 798d3a52 ZJS |
69 | <term><varname>systemd.default_standard_output=</varname></term> |
| 70 | <term><varname>systemd.default_standard_error=</varname></term> | |
| 71 | <term><varname>systemd.setenv=</varname></term> | |
| ee48dbd5 | 72 | <term><varname>systemd.machine_id=</varname></term> |
| 72267a55 LP |
73 | <term><varname>systemd.set_credential=</varname></term> |
| 74 | <term><varname>systemd.import_credentials=</varname></term> | |
| 856bfaeb LB |
75 | <term><varname>systemd.reload_limit_interval_sec=</varname></term> |
| 76 | <term><varname>systemd.reload_limit_burst=</varname></term> | |
| 798d3a52 ZJS |
77 | <listitem> |
| 78 | <para>Parameters understood by the system and service | |
| 79 | manager to control system behavior. For details, see | |
| 80 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
| 81 | </listitem> | |
| 82 | </varlistentry> | |
| 83 | ||
| 84 | <varlistentry> | |
| 85 | <term><varname>systemd.mask=</varname></term> | |
| 86 | <term><varname>systemd.wants=</varname></term> | |
| 1d84ad94 | 87 | <term><varname>systemd.debug_shell</varname></term> |
| 798d3a52 ZJS |
88 | <listitem> |
| 89 | <para>Additional parameters understood by | |
| 90 | <citerefentry><refentrytitle>systemd-debug-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 91 | to mask or start specific units at boot, or invoke a debug | |
| 92 | shell on tty9.</para> | |
| 93 | </listitem> | |
| 94 | </varlistentry> | |
| 95 | ||
| 565f3d91 LP |
96 | <varlistentry> |
| 97 | <term><varname>systemd.run=</varname></term> | |
| 98 | <term><varname>systemd.run_success_action=</varname></term> | |
| 99 | <term><varname>systemd.run_failure_action=</varname></term> | |
| 100 | <listitem> | |
| 101 | <para>Additional parameters understood by | |
| 102 | <citerefentry><refentrytitle>systemd-run-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, to | |
| 103 | run a command line specified on the kernel command line as system service after booting up.</para> | |
| 104 | </listitem> | |
| 105 | </varlistentry> | |
| 106 | ||
| c6885f5f FB |
107 | <varlistentry> |
| 108 | <term><varname>systemd.early_core_pattern=</varname></term> | |
| 109 | <listitem> | |
| 110 | <para>During early boot, the generation of core dump files is disabled until a core dump handler (if any) | |
| 11fcfc53 | 111 | takes over. This parameter allows specifying an absolute path where core dump files should be stored until |
| c6885f5f | 112 | a handler is installed. The path should be absolute and may contain specifiers, see |
| b7a47345 | 113 | <citerefentry project='man-pages'><refentrytitle>core</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details.</para> |
| c6885f5f FB |
114 | </listitem> |
| 115 | </varlistentry> | |
| 116 | ||
| 798d3a52 ZJS |
117 | <varlistentry> |
| 118 | <term><varname>systemd.restore_state=</varname></term> | |
| 119 | <listitem> | |
| 120 | <para>This parameter is understood by several system tools | |
| 121 | to control whether or not they should restore system state | |
| 122 | from the previous boot. For details, see | |
| 123 | <citerefentry><refentrytitle>systemd-backlight@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
| 124 | and | |
| af105d03 | 125 | <citerefentry><refentrytitle>systemd-rfkill.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>. |
| 798d3a52 ZJS |
126 | </para> |
| 127 | </listitem> | |
| 128 | </varlistentry> | |
| 129 | ||
| 91214a37 LP |
130 | <varlistentry> |
| 131 | <term><varname>systemd.volatile=</varname></term> | |
| 132 | <listitem> | |
| 133 | <para>This parameter controls whether the system shall boot up in volatile mode. Takes a boolean argument, or | |
| 134 | the special value <literal>state</literal>. If false (the default), normal boot mode is selected, the root | |
| 3b121157 | 135 | directory and <filename>/var/</filename> are mounted as specified on the kernel command line or |
| 91214a37 LP |
136 | <filename>/etc/fstab</filename>, or otherwise configured. If true, full state-less boot mode is selected. In |
| 137 | this case the root directory is mounted as volatile memory file system (<literal>tmpfs</literal>), and only | |
| 3b121157 | 138 | <filename>/usr/</filename> is mounted from the file system configured as root device, in read-only mode. This |
| 91214a37 | 139 | enables fully state-less boots were the vendor-supplied OS is used as shipped, with only default |
| 3b121157 | 140 | configuration and no stored state in effect, as <filename>/etc/</filename> and <filename>/var/</filename> (as |
| 91214a37 | 141 | well as all other resources shipped in the root file system) are reset at boot and lost on shutdown. If this |
| 13070a70 | 142 | setting is set to <literal>state</literal> the root file system is mounted read-only, however |
| 3b121157 | 143 | <filename>/var/</filename> is mounted as a volatile memory file system (<literal>tmpfs</literal>), so that the |
| 13070a70 LP |
144 | system boots up with the normal configuration applied, but all state reset at boot and lost at shutdown. If |
| 145 | this setting is set to <literal>overlay</literal> the root file system is set up as | |
| 146 | <literal>overlayfs</literal> mount combining the read-only root directory with a writable | |
| 147 | <literal>tmpfs</literal>, so that no modifications are made to disk, but the file system may be modified | |
| 148 | nonetheless with all changes being lost at reboot. For details, see | |
| 91214a37 LP |
149 | <citerefentry><refentrytitle>systemd-volatile-root.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> |
| 150 | and | |
| 151 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 152 | </listitem> | |
| 153 | </varlistentry> | |
| 154 | ||
| 798d3a52 ZJS |
155 | <varlistentry> |
| 156 | <term><varname>quiet</varname></term> | |
| 157 | <listitem> | |
| 158 | <para>Parameter understood by both the kernel and the system | |
| 159 | and service manager to control console log verbosity. For | |
| 160 | details, see | |
| 161 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
| 162 | </listitem> | |
| 163 | </varlistentry> | |
| 164 | ||
| 165 | <varlistentry> | |
| 166 | <term><varname>debug</varname></term> | |
| 167 | <listitem> | |
| 168 | <para>Parameter understood by both the kernel and the system | |
| 169 | and service manager to control console log verbosity. For | |
| 170 | details, see | |
| 171 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
| 172 | </listitem> | |
| 173 | </varlistentry> | |
| 174 | ||
| 175 | <varlistentry> | |
| 176 | <term><varname>-b</varname></term> | |
| dcd61450 | 177 | <term><varname>rd.emergency</varname></term> |
| 798d3a52 | 178 | <term><varname>emergency</varname></term> |
| dcd61450 | 179 | <term><varname>rd.rescue</varname></term> |
| 798d3a52 ZJS |
180 | <term><varname>rescue</varname></term> |
| 181 | <term><varname>single</varname></term> | |
| 182 | <term><varname>s</varname></term> | |
| 183 | <term><varname>S</varname></term> | |
| 184 | <term><varname>1</varname></term> | |
| 185 | <term><varname>2</varname></term> | |
| 186 | <term><varname>3</varname></term> | |
| 187 | <term><varname>4</varname></term> | |
| 188 | <term><varname>5</varname></term> | |
| 189 | <listitem> | |
| 190 | <para>Parameters understood by the system and service | |
| dcd61450 | 191 | manager, as compatibility and convenience options. For details, see |
| 798d3a52 ZJS |
192 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> |
| 193 | </listitem> | |
| 194 | </varlistentry> | |
| 195 | ||
| 196 | <varlistentry> | |
| 197 | <term><varname>locale.LANG=</varname></term> | |
| 198 | <term><varname>locale.LANGUAGE=</varname></term> | |
| 199 | <term><varname>locale.LC_CTYPE=</varname></term> | |
| 200 | <term><varname>locale.LC_NUMERIC=</varname></term> | |
| 201 | <term><varname>locale.LC_TIME=</varname></term> | |
| 202 | <term><varname>locale.LC_COLLATE=</varname></term> | |
| 203 | <term><varname>locale.LC_MONETARY=</varname></term> | |
| 204 | <term><varname>locale.LC_MESSAGES=</varname></term> | |
| 205 | <term><varname>locale.LC_PAPER=</varname></term> | |
| 206 | <term><varname>locale.LC_NAME=</varname></term> | |
| 207 | <term><varname>locale.LC_ADDRESS=</varname></term> | |
| 208 | <term><varname>locale.LC_TELEPHONE=</varname></term> | |
| 209 | <term><varname>locale.LC_MEASUREMENT=</varname></term> | |
| 210 | <term><varname>locale.LC_IDENTIFICATION=</varname></term> | |
| 211 | <listitem> | |
| 212 | <para>Parameters understood by the system and service | |
| 213 | manager to control locale and language settings. For | |
| 214 | details, see | |
| 215 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
| 216 | </listitem> | |
| 217 | </varlistentry> | |
| 218 | ||
| 219 | <varlistentry> | |
| 220 | <term><varname>fsck.mode=</varname></term> | |
| 221 | <term><varname>fsck.repair=</varname></term> | |
| 222 | ||
| 223 | <listitem> | |
| 224 | <para>Parameters understood by the file system checker | |
| 225 | services. For details, see | |
| 226 | <citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 227 | </listitem> | |
| 228 | </varlistentry> | |
| 229 | ||
| 230 | <varlistentry> | |
| 231 | <term><varname>quotacheck.mode=</varname></term> | |
| 232 | ||
| 233 | <listitem> | |
| 234 | <para>Parameter understood by the file quota checker | |
| 235 | service. For details, see | |
| 236 | <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 237 | </listitem> | |
| 238 | </varlistentry> | |
| 239 | ||
| 240 | <varlistentry> | |
| 241 | <term><varname>systemd.journald.forward_to_syslog=</varname></term> | |
| 242 | <term><varname>systemd.journald.forward_to_kmsg=</varname></term> | |
| 243 | <term><varname>systemd.journald.forward_to_console=</varname></term> | |
| 244 | <term><varname>systemd.journald.forward_to_wall=</varname></term> | |
| 245 | ||
| 246 | <listitem> | |
| 247 | <para>Parameters understood by the journal service. For | |
| 248 | details, see | |
| 249 | <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 250 | </listitem> | |
| 251 | </varlistentry> | |
| 252 | ||
| 253 | <varlistentry> | |
| 254 | <term><varname>vconsole.keymap=</varname></term> | |
| 72ccee50 | 255 | <term><varname>vconsole.keymap_toggle=</varname></term> |
| 798d3a52 | 256 | <term><varname>vconsole.font=</varname></term> |
| 72ccee50 ZJS |
257 | <term><varname>vconsole.font_map=</varname></term> |
| 258 | <term><varname>vconsole.font_unimap=</varname></term> | |
| 798d3a52 ZJS |
259 | |
| 260 | <listitem> | |
| 72ccee50 ZJS |
261 | <para>Parameters understood by the virtual console setup logic. For details, see |
| 262 | <citerefentry><refentrytitle>vconsole.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> | |
| 798d3a52 ZJS |
263 | </listitem> |
| 264 | </varlistentry> | |
| 265 | ||
| 266 | <varlistentry> | |
| 64a3494c FB |
267 | <term><varname>udev.log_level=</varname></term> |
| 268 | <term><varname>rd.udev.log_level=</varname></term> | |
| 1d84ad94 LP |
269 | <term><varname>udev.children_max=</varname></term> |
| 270 | <term><varname>rd.udev.children_max=</varname></term> | |
| 271 | <term><varname>udev.exec_delay=</varname></term> | |
| 272 | <term><varname>rd.udev.exec_delay=</varname></term> | |
| 273 | <term><varname>udev.event_timeout=</varname></term> | |
| 274 | <term><varname>rd.udev.event_timeout=</varname></term> | |
| e2099267 MS |
275 | <term><varname>udev.timeout_signal=</varname></term> |
| 276 | <term><varname>rd.udev.timeout_signal=</varname></term> | |
| 95ac5230 LP |
277 | <term><varname>udev.blockdev_read_only</varname></term> |
| 278 | <term><varname>rd.udev.blockdev_read_only</varname></term> | |
| 798d3a52 | 279 | <term><varname>net.ifnames=</varname></term> |
| f7e81fd9 | 280 | <term><varname>net.naming-scheme=</varname></term> |
| 798d3a52 ZJS |
281 | |
| 282 | <listitem> | |
| 283 | <para>Parameters understood by the device event managing | |
| 284 | daemon. For details, see | |
| 285 | <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 286 | </listitem> | |
| 287 | </varlistentry> | |
| 288 | ||
| 289 | <varlistentry> | |
| 290 | <term><varname>plymouth.enable=</varname></term> | |
| 291 | ||
| 292 | <listitem> | |
| 293 | <para>May be used to disable the Plymouth boot splash. For | |
| 294 | details, see | |
| 295 | <citerefentry project='die-net'><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 296 | </listitem> | |
| 297 | </varlistentry> | |
| 298 | ||
| 299 | <varlistentry> | |
| 300 | <term><varname>luks=</varname></term> | |
| 301 | <term><varname>rd.luks=</varname></term> | |
| 302 | <term><varname>luks.crypttab=</varname></term> | |
| 303 | <term><varname>rd.luks.crypttab=</varname></term> | |
| 304 | <term><varname>luks.name=</varname></term> | |
| 305 | <term><varname>rd.luks.name=</varname></term> | |
| 306 | <term><varname>luks.uuid=</varname></term> | |
| 307 | <term><varname>rd.luks.uuid=</varname></term> | |
| 308 | <term><varname>luks.options=</varname></term> | |
| 309 | <term><varname>rd.luks.options=</varname></term> | |
| 310 | <term><varname>luks.key=</varname></term> | |
| 311 | <term><varname>rd.luks.key=</varname></term> | |
| 312 | ||
| 313 | <listitem> | |
| 314 | <para>Configures the LUKS full-disk encryption logic at | |
| 315 | boot. For details, see | |
| 316 | <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 317 | </listitem> | |
| 318 | </varlistentry> | |
| 319 | ||
| 320 | <varlistentry> | |
| 321 | <term><varname>fstab=</varname></term> | |
| 322 | <term><varname>rd.fstab=</varname></term> | |
| 323 | ||
| 324 | <listitem> | |
| 325 | <para>Configures the <filename>/etc/fstab</filename> logic | |
| 326 | at boot. For details, see | |
| 327 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 328 | </listitem> | |
| 329 | </varlistentry> | |
| 330 | ||
| 331 | <varlistentry> | |
| 332 | <term><varname>root=</varname></term> | |
| 333 | <term><varname>rootfstype=</varname></term> | |
| d6a12e7c | 334 | <term><varname>rootflags=</varname></term> |
| 798d3a52 ZJS |
335 | <term><varname>ro</varname></term> |
| 336 | <term><varname>rw</varname></term> | |
| 337 | ||
| 338 | <listitem> | |
| cf451f38 LP |
339 | <para>Configures the root file system and its file system type and mount options, as well as |
| 340 | whether it shall be mounted read-only or read-write initially. For details, see | |
| 798d3a52 | 341 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> |
| cf451f38 LP |
342 | |
| 343 | <para>If <varname>root=</varname> is not set (or set to <literal>gpt-auto</literal>) the automatic | |
| 344 | root partition discovery implemented by | |
| 345 | <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
| 346 | will be in effect. In this case <varname>rootfstype=</varname>, <varname>rootflags=</varname>, | |
| 347 | <varname>ro</varname>, <varname>rw</varname> will be interpreted by | |
| 348 | <command>systemd-gpt-auto-generator</command>.</para> | |
| 798d3a52 ZJS |
349 | </listitem> |
| 350 | </varlistentry> | |
| 351 | ||
| 6dfcea32 TH |
352 | <varlistentry> |
| 353 | <term><varname>mount.usr=</varname></term> | |
| 354 | <term><varname>mount.usrfstype=</varname></term> | |
| 355 | <term><varname>mount.usrflags=</varname></term> | |
| 356 | ||
| 357 | <listitem> | |
| 358 | <para>Configures the /usr file system (if required) and | |
| 359 | its file system type and mount options. For details, see | |
| 360 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 361 | </listitem> | |
| 362 | </varlistentry> | |
| 363 | ||
| 2f3dfc6f | 364 | <varlistentry> |
| 08b04ec7 GP |
365 | <term><varname>veritytab=</varname></term> |
| 366 | <term><varname>rd.veritytab=</varname></term> | |
| 2f3dfc6f LP |
367 | <term><varname>roothash=</varname></term> |
| 368 | <term><varname>systemd.verity=</varname></term> | |
| 369 | <term><varname>rd.systemd.verity=</varname></term> | |
| 370 | <term><varname>systemd.verity_root_data=</varname></term> | |
| 371 | <term><varname>systemd.verity_root_hash=</varname></term> | |
| 0141102f | 372 | <term><varname>systemd.verity.root_options=</varname></term> |
| e5196eee MB |
373 | <term><varname>usrhash=</varname></term> |
| 374 | <term><varname>systemd.verity_usr_data=</varname></term> | |
| 375 | <term><varname>systemd.verity_usr_hash=</varname></term> | |
| 376 | <term><varname>systemd.verity_usr_options=</varname></term> | |
| 2f3dfc6f | 377 | <listitem> |
| e5196eee | 378 | <para>Configures the integrity protection root hash for the root and <filename>/usr</filename> file systems, and other related |
| 2f3dfc6f LP |
379 | parameters. For details, see |
| 380 | <citerefentry><refentrytitle>systemd-veritysetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 381 | </listitem> | |
| 382 | </varlistentry> | |
| 383 | ||
| 21d00e52 LB |
384 | <varlistentry> |
| 385 | <term><varname>systemd.getty_auto=</varname></term> | |
| 386 | ||
| 387 | <listitem> | |
| 388 | <para>Configures whether the <filename>serial-getty@.service</filename> will run. | |
| 389 | For details, see | |
| 390 | <citerefentry><refentrytitle>systemd-getty-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 391 | </listitem> | |
| 392 | </varlistentry> | |
| 393 | ||
| 798d3a52 ZJS |
394 | <varlistentry> |
| 395 | <term><varname>systemd.gpt_auto=</varname></term> | |
| 396 | <term><varname>rd.systemd.gpt_auto=</varname></term> | |
| 397 | ||
| 398 | <listitem> | |
| 399 | <para>Configures whether GPT based partition auto-discovery | |
| 400 | shall be attempted. For details, see | |
| 401 | <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 402 | </listitem> | |
| 403 | </varlistentry> | |
| 404 | ||
| 959718c6 TB |
405 | <varlistentry> |
| 406 | <term><varname>systemd.default_timeout_start_sec=</varname></term> | |
| 407 | ||
| 408 | <listitem> | |
| ba669952 | 409 | <para>Overrides the default start job timeout <varname>DefaultTimeoutStartSec=</varname> at |
| 9c5ea4b1 LP |
410 | boot. For details, see |
| 411 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> | |
| c75396c3 EJ |
412 | </listitem> |
| 413 | </varlistentry> | |
| 414 | ||
| 415 | <varlistentry> | |
| 416 | <term><varname>systemd.watchdog_device=</varname></term> | |
| 417 | ||
| 418 | <listitem> | |
| ba669952 | 419 | <para>Overrides the watchdog device path <varname>WatchdogDevice=</varname>. For details, see |
| 9c5ea4b1 LP |
420 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> |
| 421 | </listitem> | |
| 422 | </varlistentry> | |
| 423 | ||
| 424 | <varlistentry> | |
| 425 | <term><varname>systemd.watchdog_sec=</varname></term> | |
| 426 | ||
| 427 | <listitem> | |
| ba669952 | 428 | <para>Overrides the watchdog timeout settings otherwise configured with |
| 9c5ea4b1 LP |
429 | <varname>RuntimeWatchdog=</varname>, <varname>RebootWatchdog=</varname> and |
| 430 | <varname>KExecWatchdogSec=</varname>. Takes a time value (if no unit is specified, seconds is the | |
| 431 | implicitly assumed time unit) or the special strings <literal>off</literal> or | |
| 432 | <literal>default</literal>. For details, see | |
| c75396c3 | 433 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> |
| 959718c6 TB |
434 | </listitem> |
| 435 | </varlistentry> | |
| 436 | ||
| 5717062e CK |
437 | <varlistentry> |
| 438 | <term><varname>systemd.watchdog_pre_sec=</varname></term> | |
| 439 | ||
| 440 | <listitem> | |
| 441 | <para>Overrides the watchdog pre-timeout settings otherwise configured with | |
| 442 | <varname>RuntimeWatchdogPreSec=</varname>. Takes a time value (if no unit is specified, seconds is the | |
| 443 | implicitly assumed time unit) or the special strings <literal>off</literal> or | |
| 444 | <literal>default</literal>. For details, see | |
| 445 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> | |
| 446 | </listitem> | |
| 447 | </varlistentry> | |
| 448 | ||
| aff3a9e1 LB |
449 | <varlistentry> |
| 450 | <term><varname>systemd.watchdog_pretimeout_governor=</varname></term> | |
| 451 | ||
| 452 | <listitem> | |
| 453 | <para>Overrides the watchdog pre-timeout settings otherwise configured with | |
| 454 | <varname>RuntimeWatchdogPreGovernor=</varname>. Takes a string value. For details, see | |
| 455 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> | |
| 456 | </listitem> | |
| 457 | </varlistentry> | |
| 458 | ||
| 68d58f38 LP |
459 | <varlistentry> |
| 460 | <term><varname>systemd.cpu_affinity=</varname></term> | |
| 461 | ||
| 462 | <listitem> | |
| 463 | <para>Overrides the CPU affinity mask for the service manager and the default for all child | |
| 464 | processes it forks. This takes precedence over <varname>CPUAffinity=</varname>, see | |
| 465 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
| 466 | for details.</para> | |
| 467 | </listitem> | |
| 468 | </varlistentry> | |
| 469 | ||
| 798d3a52 | 470 | <varlistentry> |
| 1d84ad94 LP |
471 | <term><varname>modules_load=</varname></term> |
| 472 | <term><varname>rd.modules_load=</varname></term> | |
| 798d3a52 ZJS |
473 | |
| 474 | <listitem> | |
| 475 | <para>Load a specific kernel module early at boot. For | |
| 476 | details, see | |
| 477 | <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 478 | </listitem> | |
| 479 | </varlistentry> | |
| 480 | ||
| 481 | <varlistentry> | |
| 482 | <term><varname>resume=</varname></term> | |
| 8b6805a2 | 483 | <term><varname>resumeflags=</varname></term> |
| 798d3a52 ZJS |
484 | |
| 485 | <listitem> | |
| 486 | <para>Enables resume from hibernation using the specified | |
| 8b6805a2 | 487 | device and mount options. All |
| 3ba3a79d | 488 | <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>-like |
| 798d3a52 ZJS |
489 | paths are supported. For details, see |
| 490 | <citerefentry><refentrytitle>systemd-hibernate-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 491 | </listitem> | |
| 492 | </varlistentry> | |
| f582cbca LP |
493 | |
| 494 | <varlistentry> | |
| 495 | <term><varname>systemd.firstboot=</varname></term> | |
| 496 | ||
| 497 | <listitem><para>Takes a boolean argument, defaults to on. If off, | |
| 498 | <citerefentry><refentrytitle>systemd-firstboot.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
| 814872e9 LP |
499 | will not query the user for basic system settings, even if the system boots up for the first time and |
| 500 | the relevant settings are not initialized yet. Not to be confused with | |
| 501 | <varname>systemd.condition-first-boot=</varname> (see below), which overrides the result of the | |
| 502 | <varname>ConditionFirstBoot=</varname> unit file condition, and thus controls more than just | |
| 503 | <filename>systemd-firstboot.service</filename> behaviour.</para></listitem> | |
| f582cbca | 504 | </varlistentry> |
| f8b4ae29 LP |
505 | |
| 506 | <varlistentry> | |
| 507 | <term><varname>systemd.condition-needs-update=</varname></term> | |
| 508 | ||
| 509 | <listitem><para>Takes a boolean argument. If specified, overrides the result of | |
| 510 | <varname>ConditionNeedsUpdate=</varname> unit condition checks. See | |
| 511 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for | |
| 512 | details.</para></listitem> | |
| 513 | </varlistentry> | |
| 814872e9 LP |
514 | |
| 515 | <varlistentry> | |
| 516 | <term><varname>systemd.condition-first-boot=</varname></term> | |
| 517 | ||
| 518 | <listitem><para>Takes a boolean argument. If specified, overrides the result of | |
| 519 | <varname>ConditionFirstBoot=</varname> unit condition checks. See | |
| 520 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for | |
| 521 | details. Not to be confused with <varname>systemd.firstboot=</varname> which only controls behaviour | |
| 522 | of the <filename>systemd-firstboot.service</filename> system service but has no effect on the | |
| 523 | condition check (see above).</para></listitem> | |
| 524 | </varlistentry> | |
| 3753325b LP |
525 | |
| 526 | <varlistentry> | |
| 527 | <term><varname>systemd.clock-usec=</varname></term> | |
| 528 | ||
| 529 | <listitem><para>Takes a decimal, numeric timestamp in µs since January 1st 1970, 00:00am, to set the | |
| 18d9cee0 LP |
530 | system clock to. The system time is set to the specified timestamp early during boot. It is not |
| 531 | propagated to the hardware clock (RTC).</para></listitem> | |
| 532 | </varlistentry> | |
| 533 | ||
| 534 | <varlistentry> | |
| 535 | <term><varname>systemd.random-seed=</varname></term> | |
| 536 | ||
| 537 | <listitem><para>Takes a base64 encoded random seed value to credit with full entropy to the kernel's | |
| 538 | random pool during early service manager initialization. This option is useful in testing | |
| 539 | environments where delays due to random pool initialization in entropy starved virtual machines shall | |
| 540 | be avoided.</para> | |
| 541 | ||
| 542 | <para>Note that if this option is used the seed is accessible to unprivileged programs from | |
| 543 | <filename>/proc/cmdline</filename>. This option is hence a security risk when used outside of test | |
| 544 | systems, since the (possibly) only seed used for initialization of the kernel's entropy pool might be | |
| 545 | easily acquired by unprivileged programs.</para> | |
| 546 | ||
| 547 | <para>It is recommended to pass 512 bytes of randomized data (as that matches the Linux kernel pool | |
| 548 | size), which may be generated with a command like the following:</para> | |
| 549 | ||
| 550 | <programlisting>dd if=/dev/urandom bs=512 count=1 status=none | base64 -w 0</programlisting> | |
| 551 | ||
| 552 | <para>Again: do not use this option outside of testing environments, it's a security risk elsewhere, | |
| 553 | as secret key material derived from the entropy pool can possibly be reconstructed by unprivileged | |
| 554 | programs.</para> | |
| 555 | </listitem> | |
| 3753325b | 556 | </varlistentry> |
| 34293dfa LP |
557 | |
| 558 | <varlistentry> | |
| 559 | <term><varname>systemd.hostname=</varname></term> | |
| 560 | ||
| 561 | <listitem><para>Accepts a hostname to set during early boot. If specified takes precedence over what | |
| 562 | is set in <filename>/etc/hostname</filename>. Note that this does not bar later runtime changes to | |
| 563 | the hostname, it simply controls the initial hostname set during early boot.</para></listitem> | |
| 564 | </varlistentry> | |
| 798d3a52 | 565 | </variablelist> |
| 7a9e0bd0 | 566 | </refsect1> |
| 798d3a52 | 567 | |
| 7a9e0bd0 ZJS |
568 | <refsect1> |
| 569 | <title>History</title> | |
| 570 | ||
| 571 | <variablelist> | |
| 572 | <varlistentry> | |
| 573 | <term>systemd 252</term> | |
| 574 | <listitem><para>Kernel command-line arguments <varname>systemd.unified_cgroup_hierarchy</varname> | |
| 575 | and <varname>systemd.legacy_systemd_cgroup_controller</varname> were deprecated. Please switch to | |
| 576 | the unified cgroup hierarchy.</para></listitem> | |
| 577 | </varlistentry> | |
| 578 | </variablelist> | |
| 798d3a52 ZJS |
579 | </refsect1> |
| 580 | ||
| 581 | <refsect1> | |
| 582 | <title>See Also</title> | |
| 583 | <para> | |
| 584 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
| d1698b82 | 585 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, |
| 798d3a52 | 586 | <citerefentry project='man-pages'><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>, |
| af105d03 | 587 | <citerefentry project='man-pages'><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>, |
| 798d3a52 ZJS |
588 | <citerefentry><refentrytitle>systemd-debug-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 589 | <citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 590 | <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 591 | <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 592 | <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 593 | <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 594 | <citerefentry project='die-net'><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 595 | <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 2f3dfc6f | 596 | <citerefentry><refentrytitle>systemd-veritysetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 798d3a52 | 597 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 21d00e52 | 598 | <citerefentry><refentrytitle>systemd-getty-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 798d3a52 | 599 | <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 91214a37 | 600 | <citerefentry><refentrytitle>systemd-volatile-root.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 798d3a52 ZJS |
601 | <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 602 | <citerefentry><refentrytitle>systemd-backlight@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| af105d03 | 603 | <citerefentry><refentrytitle>systemd-rfkill.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| f582cbca | 604 | <citerefentry><refentrytitle>systemd-hibernate-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 4e5aa791 ZJS |
605 | <citerefentry><refentrytitle>systemd-firstboot.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 606 | <citerefentry><refentrytitle>bootctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
| 798d3a52 ZJS |
607 | </para> |
| 608 | </refsect1> | |
| c66e7bc7 LP |
609 | |
| 610 | </refentry> |