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 | ||
| 28f0aef4 ZJS |
30 | <para>The kernel, the initial RAM disk (initrd) and basic userspace functionality may be configured at |
| 31 | boot via kernel command line arguments. In addition, various systemd tools look at the EFI variable | |
| 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 ZJS |
38 | see |
| 39 | <ulink url="https://www.kernel.org/doc/html/latest/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 | ||
| 43 | <para>For command line parameters understood by the initial RAM | |
| 44 | disk, please see | |
| af105d03 | 45 | <citerefentry project='man-pages'><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>, |
| 798d3a52 ZJS |
46 | or the documentation of the specific initrd implementation of your |
| 47 | installation.</para> | |
| 48 | </refsect1> | |
| 49 | ||
| 50 | <refsect1> | |
| 51 | <title>Core OS Command Line Arguments</title> | |
| 52 | ||
| 53 | <variablelist class='kernel-commandline-options'> | |
| 54 | <varlistentry> | |
| 55 | <term><varname>systemd.unit=</varname></term> | |
| 56 | <term><varname>rd.systemd.unit=</varname></term> | |
| 770c4777 | 57 | <term><varname>systemd.dump_core</varname></term> |
| c6885f5f | 58 | <term><varname>systemd.early_core_pattern=</varname></term> |
| 770c4777 ZJS |
59 | <term><varname>systemd.crash_chvt</varname></term> |
| 60 | <term><varname>systemd.crash_shell</varname></term> | |
| 61 | <term><varname>systemd.crash_reboot</varname></term> | |
| 62 | <term><varname>systemd.confirm_spawn</varname></term> | |
| 2a12e32e | 63 | <term><varname>systemd.service_watchdogs</varname></term> |
| 770c4777 | 64 | <term><varname>systemd.show_status</varname></term> |
| 36cf4507 | 65 | <term><varname>systemd.status_unit_format=</varname></term> |
| 798d3a52 ZJS |
66 | <term><varname>systemd.log_target=</varname></term> |
| 67 | <term><varname>systemd.log_level=</varname></term> | |
| 798d3a52 | 68 | <term><varname>systemd.log_location=</varname></term> |
| 770c4777 | 69 | <term><varname>systemd.log_color</varname></term> |
| 798d3a52 ZJS |
70 | <term><varname>systemd.default_standard_output=</varname></term> |
| 71 | <term><varname>systemd.default_standard_error=</varname></term> | |
| 72 | <term><varname>systemd.setenv=</varname></term> | |
| ee48dbd5 | 73 | <term><varname>systemd.machine_id=</varname></term> |
| ee075513 ZJS |
74 | <term><varname>systemd.unified_cgroup_hierarchy</varname></term> |
| 75 | <term><varname>systemd.legacy_systemd_cgroup_controller</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> | |
| 80 | </listitem> | |
| 81 | </varlistentry> | |
| 82 | ||
| 83 | <varlistentry> | |
| 84 | <term><varname>systemd.mask=</varname></term> | |
| 85 | <term><varname>systemd.wants=</varname></term> | |
| 1d84ad94 | 86 | <term><varname>systemd.debug_shell</varname></term> |
| 798d3a52 ZJS |
87 | <listitem> |
| 88 | <para>Additional parameters understood by | |
| 89 | <citerefentry><refentrytitle>systemd-debug-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 90 | to mask or start specific units at boot, or invoke a debug | |
| 91 | shell on tty9.</para> | |
| 92 | </listitem> | |
| 93 | </varlistentry> | |
| 94 | ||
| 565f3d91 LP |
95 | <varlistentry> |
| 96 | <term><varname>systemd.run=</varname></term> | |
| 97 | <term><varname>systemd.run_success_action=</varname></term> | |
| 98 | <term><varname>systemd.run_failure_action=</varname></term> | |
| 99 | <listitem> | |
| 100 | <para>Additional parameters understood by | |
| 101 | <citerefentry><refentrytitle>systemd-run-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, to | |
| 102 | run a command line specified on the kernel command line as system service after booting up.</para> | |
| 103 | </listitem> | |
| 104 | </varlistentry> | |
| 105 | ||
| c6885f5f FB |
106 | <varlistentry> |
| 107 | <term><varname>systemd.early_core_pattern=</varname></term> | |
| 108 | <listitem> | |
| 109 | <para>During early boot, the generation of core dump files is disabled until a core dump handler (if any) | |
| 11fcfc53 | 110 | takes over. This parameter allows specifying an absolute path where core dump files should be stored until |
| c6885f5f | 111 | a handler is installed. The path should be absolute and may contain specifiers, see |
| b7a47345 | 112 | <citerefentry project='man-pages'><refentrytitle>core</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details.</para> |
| c6885f5f FB |
113 | </listitem> |
| 114 | </varlistentry> | |
| 115 | ||
| 798d3a52 ZJS |
116 | <varlistentry> |
| 117 | <term><varname>systemd.restore_state=</varname></term> | |
| 118 | <listitem> | |
| 119 | <para>This parameter is understood by several system tools | |
| 120 | to control whether or not they should restore system state | |
| 121 | from the previous boot. For details, see | |
| 122 | <citerefentry><refentrytitle>systemd-backlight@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
| 123 | and | |
| af105d03 | 124 | <citerefentry><refentrytitle>systemd-rfkill.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>. |
| 798d3a52 ZJS |
125 | </para> |
| 126 | </listitem> | |
| 127 | </varlistentry> | |
| 128 | ||
| 91214a37 LP |
129 | <varlistentry> |
| 130 | <term><varname>systemd.volatile=</varname></term> | |
| 131 | <listitem> | |
| 132 | <para>This parameter controls whether the system shall boot up in volatile mode. Takes a boolean argument, or | |
| 133 | the special value <literal>state</literal>. If false (the default), normal boot mode is selected, the root | |
| 3b121157 | 134 | directory and <filename>/var/</filename> are mounted as specified on the kernel command line or |
| 91214a37 LP |
135 | <filename>/etc/fstab</filename>, or otherwise configured. If true, full state-less boot mode is selected. In |
| 136 | this case the root directory is mounted as volatile memory file system (<literal>tmpfs</literal>), and only | |
| 3b121157 | 137 | <filename>/usr/</filename> is mounted from the file system configured as root device, in read-only mode. This |
| 91214a37 | 138 | enables fully state-less boots were the vendor-supplied OS is used as shipped, with only default |
| 3b121157 | 139 | configuration and no stored state in effect, as <filename>/etc/</filename> and <filename>/var/</filename> (as |
| 91214a37 | 140 | well as all other resources shipped in the root file system) are reset at boot and lost on shutdown. If this |
| 13070a70 | 141 | setting is set to <literal>state</literal> the root file system is mounted read-only, however |
| 3b121157 | 142 | <filename>/var/</filename> is mounted as a volatile memory file system (<literal>tmpfs</literal>), so that the |
| 13070a70 LP |
143 | system boots up with the normal configuration applied, but all state reset at boot and lost at shutdown. If |
| 144 | this setting is set to <literal>overlay</literal> the root file system is set up as | |
| 145 | <literal>overlayfs</literal> mount combining the read-only root directory with a writable | |
| 146 | <literal>tmpfs</literal>, so that no modifications are made to disk, but the file system may be modified | |
| 147 | nonetheless with all changes being lost at reboot. For details, see | |
| 91214a37 LP |
148 | <citerefentry><refentrytitle>systemd-volatile-root.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> |
| 149 | and | |
| 150 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 151 | </listitem> | |
| 152 | </varlistentry> | |
| 153 | ||
| 798d3a52 ZJS |
154 | <varlistentry> |
| 155 | <term><varname>quiet</varname></term> | |
| 156 | <listitem> | |
| 157 | <para>Parameter understood by both the kernel and the system | |
| 158 | and service manager to control console log verbosity. For | |
| 159 | details, see | |
| 160 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
| 161 | </listitem> | |
| 162 | </varlistentry> | |
| 163 | ||
| 164 | <varlistentry> | |
| 165 | <term><varname>debug</varname></term> | |
| 166 | <listitem> | |
| 167 | <para>Parameter understood by both the kernel and the system | |
| 168 | and service manager to control console log verbosity. For | |
| 169 | details, see | |
| 170 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
| 171 | </listitem> | |
| 172 | </varlistentry> | |
| 173 | ||
| 174 | <varlistentry> | |
| 175 | <term><varname>-b</varname></term> | |
| dcd61450 | 176 | <term><varname>rd.emergency</varname></term> |
| 798d3a52 | 177 | <term><varname>emergency</varname></term> |
| dcd61450 | 178 | <term><varname>rd.rescue</varname></term> |
| 798d3a52 ZJS |
179 | <term><varname>rescue</varname></term> |
| 180 | <term><varname>single</varname></term> | |
| 181 | <term><varname>s</varname></term> | |
| 182 | <term><varname>S</varname></term> | |
| 183 | <term><varname>1</varname></term> | |
| 184 | <term><varname>2</varname></term> | |
| 185 | <term><varname>3</varname></term> | |
| 186 | <term><varname>4</varname></term> | |
| 187 | <term><varname>5</varname></term> | |
| 188 | <listitem> | |
| 189 | <para>Parameters understood by the system and service | |
| dcd61450 | 190 | manager, as compatibility and convenience options. For details, see |
| 798d3a52 ZJS |
191 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> |
| 192 | </listitem> | |
| 193 | </varlistentry> | |
| 194 | ||
| 195 | <varlistentry> | |
| 196 | <term><varname>locale.LANG=</varname></term> | |
| 197 | <term><varname>locale.LANGUAGE=</varname></term> | |
| 198 | <term><varname>locale.LC_CTYPE=</varname></term> | |
| 199 | <term><varname>locale.LC_NUMERIC=</varname></term> | |
| 200 | <term><varname>locale.LC_TIME=</varname></term> | |
| 201 | <term><varname>locale.LC_COLLATE=</varname></term> | |
| 202 | <term><varname>locale.LC_MONETARY=</varname></term> | |
| 203 | <term><varname>locale.LC_MESSAGES=</varname></term> | |
| 204 | <term><varname>locale.LC_PAPER=</varname></term> | |
| 205 | <term><varname>locale.LC_NAME=</varname></term> | |
| 206 | <term><varname>locale.LC_ADDRESS=</varname></term> | |
| 207 | <term><varname>locale.LC_TELEPHONE=</varname></term> | |
| 208 | <term><varname>locale.LC_MEASUREMENT=</varname></term> | |
| 209 | <term><varname>locale.LC_IDENTIFICATION=</varname></term> | |
| 210 | <listitem> | |
| 211 | <para>Parameters understood by the system and service | |
| 212 | manager to control locale and language settings. For | |
| 213 | details, see | |
| 214 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> | |
| 215 | </listitem> | |
| 216 | </varlistentry> | |
| 217 | ||
| 218 | <varlistentry> | |
| 219 | <term><varname>fsck.mode=</varname></term> | |
| 220 | <term><varname>fsck.repair=</varname></term> | |
| 221 | ||
| 222 | <listitem> | |
| 223 | <para>Parameters understood by the file system checker | |
| 224 | services. For details, see | |
| 225 | <citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 226 | </listitem> | |
| 227 | </varlistentry> | |
| 228 | ||
| 229 | <varlistentry> | |
| 230 | <term><varname>quotacheck.mode=</varname></term> | |
| 231 | ||
| 232 | <listitem> | |
| 233 | <para>Parameter understood by the file quota checker | |
| 234 | service. For details, see | |
| 235 | <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 236 | </listitem> | |
| 237 | </varlistentry> | |
| 238 | ||
| 239 | <varlistentry> | |
| 240 | <term><varname>systemd.journald.forward_to_syslog=</varname></term> | |
| 241 | <term><varname>systemd.journald.forward_to_kmsg=</varname></term> | |
| 242 | <term><varname>systemd.journald.forward_to_console=</varname></term> | |
| 243 | <term><varname>systemd.journald.forward_to_wall=</varname></term> | |
| 244 | ||
| 245 | <listitem> | |
| 246 | <para>Parameters understood by the journal service. For | |
| 247 | details, see | |
| 248 | <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 249 | </listitem> | |
| 250 | </varlistentry> | |
| 251 | ||
| 252 | <varlistentry> | |
| 253 | <term><varname>vconsole.keymap=</varname></term> | |
| 72ccee50 | 254 | <term><varname>vconsole.keymap_toggle=</varname></term> |
| 798d3a52 | 255 | <term><varname>vconsole.font=</varname></term> |
| 72ccee50 ZJS |
256 | <term><varname>vconsole.font_map=</varname></term> |
| 257 | <term><varname>vconsole.font_unimap=</varname></term> | |
| 798d3a52 ZJS |
258 | |
| 259 | <listitem> | |
| 72ccee50 ZJS |
260 | <para>Parameters understood by the virtual console setup logic. For details, see |
| 261 | <citerefentry><refentrytitle>vconsole.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> | |
| 798d3a52 ZJS |
262 | </listitem> |
| 263 | </varlistentry> | |
| 264 | ||
| 265 | <varlistentry> | |
| 64a3494c FB |
266 | <term><varname>udev.log_level=</varname></term> |
| 267 | <term><varname>rd.udev.log_level=</varname></term> | |
| 1d84ad94 LP |
268 | <term><varname>udev.children_max=</varname></term> |
| 269 | <term><varname>rd.udev.children_max=</varname></term> | |
| 270 | <term><varname>udev.exec_delay=</varname></term> | |
| 271 | <term><varname>rd.udev.exec_delay=</varname></term> | |
| 272 | <term><varname>udev.event_timeout=</varname></term> | |
| 273 | <term><varname>rd.udev.event_timeout=</varname></term> | |
| e2099267 MS |
274 | <term><varname>udev.timeout_signal=</varname></term> |
| 275 | <term><varname>rd.udev.timeout_signal=</varname></term> | |
| 95ac5230 LP |
276 | <term><varname>udev.blockdev_read_only</varname></term> |
| 277 | <term><varname>rd.udev.blockdev_read_only</varname></term> | |
| 798d3a52 | 278 | <term><varname>net.ifnames=</varname></term> |
| f7e81fd9 | 279 | <term><varname>net.naming-scheme=</varname></term> |
| 798d3a52 ZJS |
280 | |
| 281 | <listitem> | |
| 282 | <para>Parameters understood by the device event managing | |
| 283 | daemon. For details, see | |
| 284 | <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 285 | </listitem> | |
| 286 | </varlistentry> | |
| 287 | ||
| 288 | <varlistentry> | |
| 289 | <term><varname>plymouth.enable=</varname></term> | |
| 290 | ||
| 291 | <listitem> | |
| 292 | <para>May be used to disable the Plymouth boot splash. For | |
| 293 | details, see | |
| 294 | <citerefentry project='die-net'><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 295 | </listitem> | |
| 296 | </varlistentry> | |
| 297 | ||
| 298 | <varlistentry> | |
| 299 | <term><varname>luks=</varname></term> | |
| 300 | <term><varname>rd.luks=</varname></term> | |
| 301 | <term><varname>luks.crypttab=</varname></term> | |
| 302 | <term><varname>rd.luks.crypttab=</varname></term> | |
| 303 | <term><varname>luks.name=</varname></term> | |
| 304 | <term><varname>rd.luks.name=</varname></term> | |
| 305 | <term><varname>luks.uuid=</varname></term> | |
| 306 | <term><varname>rd.luks.uuid=</varname></term> | |
| 307 | <term><varname>luks.options=</varname></term> | |
| 308 | <term><varname>rd.luks.options=</varname></term> | |
| 309 | <term><varname>luks.key=</varname></term> | |
| 310 | <term><varname>rd.luks.key=</varname></term> | |
| 311 | ||
| 312 | <listitem> | |
| 313 | <para>Configures the LUKS full-disk encryption logic at | |
| 314 | boot. For details, see | |
| 315 | <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 316 | </listitem> | |
| 317 | </varlistentry> | |
| 318 | ||
| 319 | <varlistentry> | |
| 320 | <term><varname>fstab=</varname></term> | |
| 321 | <term><varname>rd.fstab=</varname></term> | |
| 322 | ||
| 323 | <listitem> | |
| 324 | <para>Configures the <filename>/etc/fstab</filename> logic | |
| 325 | at boot. For details, see | |
| 326 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 327 | </listitem> | |
| 328 | </varlistentry> | |
| 329 | ||
| 330 | <varlistentry> | |
| 331 | <term><varname>root=</varname></term> | |
| 332 | <term><varname>rootfstype=</varname></term> | |
| d6a12e7c | 333 | <term><varname>rootflags=</varname></term> |
| 798d3a52 ZJS |
334 | <term><varname>ro</varname></term> |
| 335 | <term><varname>rw</varname></term> | |
| 336 | ||
| 337 | <listitem> | |
| 338 | <para>Configures the root file system and its file system | |
| 339 | type and mount options, as well as whether it shall be | |
| 17ec531f | 340 | mounted read-only or read-write initially. For details, |
| 798d3a52 ZJS |
341 | see |
| 342 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 343 | </listitem> | |
| 344 | </varlistentry> | |
| 345 | ||
| 6dfcea32 TH |
346 | <varlistentry> |
| 347 | <term><varname>mount.usr=</varname></term> | |
| 348 | <term><varname>mount.usrfstype=</varname></term> | |
| 349 | <term><varname>mount.usrflags=</varname></term> | |
| 350 | ||
| 351 | <listitem> | |
| 352 | <para>Configures the /usr file system (if required) and | |
| 353 | its file system type and mount options. For details, see | |
| 354 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 355 | </listitem> | |
| 356 | </varlistentry> | |
| 357 | ||
| 2f3dfc6f | 358 | <varlistentry> |
| 08b04ec7 GP |
359 | <term><varname>veritytab=</varname></term> |
| 360 | <term><varname>rd.veritytab=</varname></term> | |
| 2f3dfc6f LP |
361 | <term><varname>roothash=</varname></term> |
| 362 | <term><varname>systemd.verity=</varname></term> | |
| 363 | <term><varname>rd.systemd.verity=</varname></term> | |
| 364 | <term><varname>systemd.verity_root_data=</varname></term> | |
| 365 | <term><varname>systemd.verity_root_hash=</varname></term> | |
| 0141102f | 366 | <term><varname>systemd.verity.root_options=</varname></term> |
| 2f3dfc6f LP |
367 | <listitem> |
| 368 | <para>Configures the integrity protection root hash for the root file system, and other related | |
| 369 | parameters. For details, see | |
| 370 | <citerefentry><refentrytitle>systemd-veritysetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 371 | </listitem> | |
| 372 | </varlistentry> | |
| 373 | ||
| 798d3a52 ZJS |
374 | <varlistentry> |
| 375 | <term><varname>systemd.gpt_auto=</varname></term> | |
| 376 | <term><varname>rd.systemd.gpt_auto=</varname></term> | |
| 377 | ||
| 378 | <listitem> | |
| 379 | <para>Configures whether GPT based partition auto-discovery | |
| 380 | shall be attempted. For details, see | |
| 381 | <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 382 | </listitem> | |
| 383 | </varlistentry> | |
| 384 | ||
| 959718c6 TB |
385 | <varlistentry> |
| 386 | <term><varname>systemd.default_timeout_start_sec=</varname></term> | |
| 387 | ||
| 388 | <listitem> | |
| 389 | <para>Overwrites the default start job timeout <varname>DefaultTimeoutStartSec=</varname> at boot. For details, | |
| 390 | see <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> | |
| c75396c3 EJ |
391 | </listitem> |
| 392 | </varlistentry> | |
| 393 | ||
| 394 | <varlistentry> | |
| 395 | <term><varname>systemd.watchdog_device=</varname></term> | |
| 396 | ||
| 397 | <listitem> | |
| 398 | <para>Overwrites the watchdog device path <varname>WatchdogDevice=</varname>. For details, see | |
| 399 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> | |
| 959718c6 TB |
400 | </listitem> |
| 401 | </varlistentry> | |
| 402 | ||
| 68d58f38 LP |
403 | <varlistentry> |
| 404 | <term><varname>systemd.cpu_affinity=</varname></term> | |
| 405 | ||
| 406 | <listitem> | |
| 407 | <para>Overrides the CPU affinity mask for the service manager and the default for all child | |
| 408 | processes it forks. This takes precedence over <varname>CPUAffinity=</varname>, see | |
| 409 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
| 410 | for details.</para> | |
| 411 | </listitem> | |
| 412 | </varlistentry> | |
| 413 | ||
| 798d3a52 | 414 | <varlistentry> |
| 1d84ad94 LP |
415 | <term><varname>modules_load=</varname></term> |
| 416 | <term><varname>rd.modules_load=</varname></term> | |
| 798d3a52 ZJS |
417 | |
| 418 | <listitem> | |
| 419 | <para>Load a specific kernel module early at boot. For | |
| 420 | details, see | |
| 421 | <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 422 | </listitem> | |
| 423 | </varlistentry> | |
| 424 | ||
| 425 | <varlistentry> | |
| 426 | <term><varname>resume=</varname></term> | |
| 8b6805a2 | 427 | <term><varname>resumeflags=</varname></term> |
| 798d3a52 ZJS |
428 | |
| 429 | <listitem> | |
| 430 | <para>Enables resume from hibernation using the specified | |
| 8b6805a2 | 431 | device and mount options. All |
| 3ba3a79d | 432 | <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>-like |
| 798d3a52 ZJS |
433 | paths are supported. For details, see |
| 434 | <citerefentry><refentrytitle>systemd-hibernate-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> | |
| 435 | </listitem> | |
| 436 | </varlistentry> | |
| f582cbca LP |
437 | |
| 438 | <varlistentry> | |
| 439 | <term><varname>systemd.firstboot=</varname></term> | |
| 440 | ||
| 441 | <listitem><para>Takes a boolean argument, defaults to on. If off, | |
| 442 | <citerefentry><refentrytitle>systemd-firstboot.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
| 814872e9 LP |
443 | will not query the user for basic system settings, even if the system boots up for the first time and |
| 444 | the relevant settings are not initialized yet. Not to be confused with | |
| 445 | <varname>systemd.condition-first-boot=</varname> (see below), which overrides the result of the | |
| 446 | <varname>ConditionFirstBoot=</varname> unit file condition, and thus controls more than just | |
| 447 | <filename>systemd-firstboot.service</filename> behaviour.</para></listitem> | |
| f582cbca | 448 | </varlistentry> |
| f8b4ae29 LP |
449 | |
| 450 | <varlistentry> | |
| 451 | <term><varname>systemd.condition-needs-update=</varname></term> | |
| 452 | ||
| 453 | <listitem><para>Takes a boolean argument. If specified, overrides the result of | |
| 454 | <varname>ConditionNeedsUpdate=</varname> unit condition checks. See | |
| 455 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for | |
| 456 | details.</para></listitem> | |
| 457 | </varlistentry> | |
| 814872e9 LP |
458 | |
| 459 | <varlistentry> | |
| 460 | <term><varname>systemd.condition-first-boot=</varname></term> | |
| 461 | ||
| 462 | <listitem><para>Takes a boolean argument. If specified, overrides the result of | |
| 463 | <varname>ConditionFirstBoot=</varname> unit condition checks. See | |
| 464 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for | |
| 465 | details. Not to be confused with <varname>systemd.firstboot=</varname> which only controls behaviour | |
| 466 | of the <filename>systemd-firstboot.service</filename> system service but has no effect on the | |
| 467 | condition check (see above).</para></listitem> | |
| 468 | </varlistentry> | |
| 3753325b LP |
469 | |
| 470 | <varlistentry> | |
| 471 | <term><varname>systemd.clock-usec=</varname></term> | |
| 472 | ||
| 473 | <listitem><para>Takes a decimal, numeric timestamp in µs since January 1st 1970, 00:00am, to set the | |
| 18d9cee0 LP |
474 | system clock to. The system time is set to the specified timestamp early during boot. It is not |
| 475 | propagated to the hardware clock (RTC).</para></listitem> | |
| 476 | </varlistentry> | |
| 477 | ||
| 478 | <varlistentry> | |
| 479 | <term><varname>systemd.random-seed=</varname></term> | |
| 480 | ||
| 481 | <listitem><para>Takes a base64 encoded random seed value to credit with full entropy to the kernel's | |
| 482 | random pool during early service manager initialization. This option is useful in testing | |
| 483 | environments where delays due to random pool initialization in entropy starved virtual machines shall | |
| 484 | be avoided.</para> | |
| 485 | ||
| 486 | <para>Note that if this option is used the seed is accessible to unprivileged programs from | |
| 487 | <filename>/proc/cmdline</filename>. This option is hence a security risk when used outside of test | |
| 488 | systems, since the (possibly) only seed used for initialization of the kernel's entropy pool might be | |
| 489 | easily acquired by unprivileged programs.</para> | |
| 490 | ||
| 491 | <para>It is recommended to pass 512 bytes of randomized data (as that matches the Linux kernel pool | |
| 492 | size), which may be generated with a command like the following:</para> | |
| 493 | ||
| 494 | <programlisting>dd if=/dev/urandom bs=512 count=1 status=none | base64 -w 0</programlisting> | |
| 495 | ||
| 496 | <para>Again: do not use this option outside of testing environments, it's a security risk elsewhere, | |
| 497 | as secret key material derived from the entropy pool can possibly be reconstructed by unprivileged | |
| 498 | programs.</para> | |
| 499 | </listitem> | |
| 3753325b | 500 | </varlistentry> |
| 34293dfa LP |
501 | |
| 502 | <varlistentry> | |
| 503 | <term><varname>systemd.hostname=</varname></term> | |
| 504 | ||
| 505 | <listitem><para>Accepts a hostname to set during early boot. If specified takes precedence over what | |
| 506 | is set in <filename>/etc/hostname</filename>. Note that this does not bar later runtime changes to | |
| 507 | the hostname, it simply controls the initial hostname set during early boot.</para></listitem> | |
| 508 | </varlistentry> | |
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509 | </variablelist> |
| 510 | ||
| 511 | </refsect1> | |
| 512 | ||
| 513 | <refsect1> | |
| 514 | <title>See Also</title> | |
| 515 | <para> | |
| 516 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
| d1698b82 | 517 | <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, |
| 798d3a52 | 518 | <citerefentry project='man-pages'><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>, |
| af105d03 | 519 | <citerefentry project='man-pages'><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>, |
| 798d3a52 ZJS |
520 | <citerefentry><refentrytitle>systemd-debug-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 521 | <citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 522 | <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 523 | <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 524 | <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 525 | <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 526 | <citerefentry project='die-net'><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 527 | <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 2f3dfc6f | 528 | <citerefentry><refentrytitle>systemd-veritysetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 798d3a52 ZJS |
529 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 530 | <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| 91214a37 | 531 | <citerefentry><refentrytitle>systemd-volatile-root.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 798d3a52 ZJS |
532 | <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 533 | <citerefentry><refentrytitle>systemd-backlight@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
| af105d03 | 534 | <citerefentry><refentrytitle>systemd-rfkill.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| f582cbca | 535 | <citerefentry><refentrytitle>systemd-hibernate-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 4e5aa791 ZJS |
536 | <citerefentry><refentrytitle>systemd-firstboot.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
| 537 | <citerefentry><refentrytitle>bootctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
| 798d3a52 ZJS |
538 | </para> |
| 539 | </refsect1> | |
| c66e7bc7 LP |
540 | |
| 541 | </refentry> |