man/kernel-command-line.xml

   1 <?xml version='1.0'?> <!--*-nxml-*-->
   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
   3         "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
   4
   5 <!--
   6   This file is part of systemd.
   7
   8   Copyright 2012 Lennart Poettering
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU Lesser General Public License as published by
  12   the Free Software Foundation; either version 2.1 of the License, or
  13   (at your option) any later version.
  14
  15   systemd is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  22 -->
  23
  24 <refentry id="kernel-command-line">
  25
  26         <refentryinfo>
  27                 <title>kernel-command-line</title>
  28                 <productname>systemd</productname>
  29
  30                 <authorgroup>
  31                         <author>
  32                                 <contrib>Developer</contrib>
  33                                 <firstname>Lennart</firstname>
  34                                 <surname>Poettering</surname>
  35                                 <email>lennart@poettering.net</email>
  36                         </author>
  37                 </authorgroup>
  38         </refentryinfo>
  39
  40         <refmeta>
  41                 <refentrytitle>kernel-command-line</refentrytitle>
  42                 <manvolnum>7</manvolnum>
  43         </refmeta>
  44
  45         <refnamediv>
  46                 <refname>kernel-command-line</refname>
  47                 <refpurpose>Kernel Command Line Parameters</refpurpose>
  48         </refnamediv>
  49
  50         <refsynopsisdiv>
  51                 <para><filename>/proc/cmdline</filename></para>
  52         </refsynopsisdiv>
  53
  54         <refsect1>
  55                 <title>Description</title>
  56
  57                 <para>The kernel, the initial RAM disk (initrd) and
  58                 basic userspace functionality may be configured at boot via
  59                 kernel command line arguments.</para>
  60
  61                 <para>For command line parameters understood by the
  62                 kernel please see <ulink
  63                 url="https://www.kernel.org/doc/Documentation/kernel-parameters.txt"><filename>kernel-parameters.txt</filename></ulink>.</para>
  64
  65                 <para>For command line paramaters understood by the
  66                 initial RAM disk, please see
  67                 <citerefentry><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
  68
  69         </refsect1>
  70
  71         <refsect1>
  72                 <title>Core OS Command Line Arguments</title>
  73
  74                 <variablelist>
  75                         <varlistentry>
  76                                 <term><varname>systemd.unit=</varname></term>
  77                                 <term><varname>rd.systemd.unit=</varname></term>
  78                                 <term><varname>systemd.dump_core=</varname></term>
  79                                 <term><varname>systemd.crash_shell=</varname></term>
  80                                 <term><varname>systemd.crash_chvt=</varname></term>
  81                                 <term><varname>systemd.confirm_spawn=</varname></term>
  82                                 <term><varname>systemd.show_status=</varname></term>
  83                                 <term><varname>systemd.sysv_console=</varname></term>
  84                                 <term><varname>systemd.log_target=</varname></term>
  85                                 <term><varname>systemd.log_level=</varname></term>
  86                                 <term><varname>systemd.log_color=</varname></term>
  87                                 <term><varname>systemd.log_location=</varname></term>
  88                                 <term><varname>systemd.default_standard_output=</varname></term>
  89                                 <term><varname>systemd.default_standard_error=</varname></term>
  90                                 <term><varname>systemd.setenv=</varname></term>
  91                                 <listitem>
  92                                         <para>Parameters understood by
  93                                         the system and service manager
  94                                         to control system behaviour. For details see
  95                                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
  96                                 </listitem>
  97                         </varlistentry>
  98
  99                         <varlistentry>
 100                                 <term><varname>quiet</varname></term>
 101                                 <listitem>
 102                                         <para>Parameter understood by
 103                                         both the kernel and the system
 104                                         and service manager to control
 105                                         console log verbosity. For
 106                                         details see
 107                                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
 108                                 </listitem>
 109                         </varlistentry>
 110
 111                         <varlistentry>
 112                                 <term><varname>emergency</varname></term>
 113                                 <term><varname>single</varname></term>
 114                                 <term><varname>s</varname></term>
 115                                 <term><varname>S</varname></term>
 116                                 <term><varname>1</varname></term>
 117                                 <term><varname>2</varname></term>
 118                                 <term><varname>3</varname></term>
 119                                 <term><varname>4</varname></term>
 120                                 <term><varname>5</varname></term>
 121                                 <listitem>
 122                                         <para>Parameters understood by
 123                                         the system and service
 124                                         manager, as compatibility
 125                                         options. For details see
 126                                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
 127                                 </listitem>
 128                         </varlistentry>
 129
 130                         <varlistentry>
 131                                 <term><varname>locale.LANG=</varname></term>
 132                                 <term><varname>locale.LANGUAGE=</varname></term>
 133                                 <term><varname>locale.LC_CTYPE=</varname></term>
 134                                 <term><varname>locale.LC_NUMERIC=</varname></term>
 135                                 <term><varname>locale.LC_TIME=</varname></term>
 136                                 <term><varname>locale.LC_COLLATE=</varname></term>
 137                                 <term><varname>locale.LC_MONETARY=</varname></term>
 138                                 <term><varname>locale.LC_MESSAGES=</varname></term>
 139                                 <term><varname>locale.LC_PAPER=</varname></term>
 140                                 <term><varname>locale.LC_NAME=</varname></term>
 141                                 <term><varname>locale.LC_ADDRESS=</varname></term>
 142                                 <term><varname>locale.LC_TELEPHONE=</varname></term>
 143                                 <term><varname>locale.LC_MEASUREMENT=</varname></term>
 144                                 <term><varname>locale.LC_IDENTIFICATION=</varname></term>
 145                                 <listitem>
 146                                         <para>Parameters understood by
 147                                         the system and service manager
 148                                         to control locale and language
 149                                         settings. For details see
 150                                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
 151                                 </listitem>
 152                         </varlistentry>
 153
 154                         <varlistentry>
 155                                 <term><varname>fsck.mode=</varname></term>
 156
 157                                 <listitem>
 158                                         <para>Parameter understood by
 159                                         the file system checker
 160                                         services. For details see
 161                                         <citerefentry><refentrytitle>fsck-root.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 162                                 </listitem>
 163                         </varlistentry>
 164
 165                         <varlistentry>
 166                                 <term><varname>quotacheck.mode=</varname></term>
 167
 168                                 <listitem>
 169                                         <para>Parameter understood by
 170                                         the file quota checker
 171                                         service. For details see
 172                                         <citerefentry><refentrytitle>quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 173                                 </listitem>
 174                         </varlistentry>
 175
 176                         <varlistentry>
 177                                 <term><varname>systemd.journald.forward_to_syslog=</varname></term>
 178                                 <term><varname>systemd.journald.forward_to_kmsg=</varname></term>
 179                                 <term><varname>systemd.journald.forward_to_console=</varname></term>
 180
 181                                 <listitem>
 182                                         <para>Parameters understood by
 183                                         the journal service. For
 184                                         details see
 185                                         <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 186                                 </listitem>
 187                         </varlistentry>
 188
 189                         <varlistentry>
 190                                 <term><varname>vconsole.keymap=</varname></term>
 191                                 <term><varname>vconsole.keymap.toggle=</varname></term>
 192                                 <term><varname>vconsole.font=</varname></term>
 193                                 <term><varname>vconsole.font.map=</varname></term>
 194                                 <term><varname>vconsole.font.unimap=</varname></term>
 195
 196                                 <listitem>
 197                                         <para>Parameters understood by
 198                                         the virtual console setup logic. For
 199                                         details see
 200                                         <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 201                                 </listitem>
 202                         </varlistentry>
 203
 204                         <varlistentry>
 205                                 <term><varname>udev.log-priority=</varname></term>
 206                                 <term><varname>rd.udev.log-priority=</varname></term>
 207                                 <term><varname>udev.children-max=</varname></term>
 208                                 <term><varname>rd.udev.children-max=</varname></term>
 209                                 <term><varname>udev.exec-delay=</varname></term>
 210                                 <term><varname>rd.udev.exec-delay=</varname></term>
 211
 212                                 <listitem>
 213                                         <para>Parameters understood by
 214                                         the device event managing daemon. For
 215                                         details see
 216                                         <citerefentry><refentrytitle>systemd-udevd</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 217                                 </listitem>
 218                         </varlistentry>
 219
 220                         <varlistentry>
 221                                 <term><varname>plymouth.enable=</varname></term>
 222
 223                                 <listitem>
 224                                         <para>May be used to disable
 225                                         the Plymouth boot splash. For
 226                                         details see
 227                                         <citerefentry><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 228                                 </listitem>
 229                         </varlistentry>
 230
 231                         <varlistentry>
 232                                 <term><varname>luks=</varname></term>
 233                                 <term><varname>rd.luks=</varname></term>
 234                                 <term><varname>luks.crypttab=</varname></term>
 235                                 <term><varname>rd.luks.crypttab=</varname></term>
 236                                 <term><varname>luks.uuid=</varname></term>
 237                                 <term><varname>rd.luks.uuid=</varname></term>
 238
 239                                 <listitem>
 240                                         <para>Configures the LUKS
 241                                         full-disk encryption logic at
 242                                         boot. For details see
 243                                         <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 244                                 </listitem>
 245                         </varlistentry>
 246
 247                         <varlistentry>
 248                                 <term><varname>fstab=</varname></term>
 249                                 <term><varname>rd.fstab=</varname></term>
 250
 251                                 <listitem>
 252                                         <para>Configures the
 253                                         <filename>/etc/fstab</filename>
 254                                         logic at boot. For details see
 255                                         <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 256                                 </listitem>
 257                         </varlistentry>
 258
 259                         <varlistentry>
 260                                 <term><varname>driver=</varname></term>
 261                                 <term><varname>rd.driver=</varname></term>
 262
 263                                 <listitem>
 264                                         <para>Load a specific kernel
 265                                         boot early at boot. For
 266                                         details see
 267                                         <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 268                                 </listitem>
 269                         </varlistentry>
 270
 271                 </variablelist>
 272
 273         </refsect1>
 274
 275         <refsect1>
 276                   <title>See Also</title>
 277                   <para>
 278                           <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 279                           <citerefentry><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 280                           <citerefentry><refentrytitle>fsck-root.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 281                           <citerefentry><refentrytitle>quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 282                           <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 283                           <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 284                           <citerefentry><refentrytitle>systemd-udevd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 285                           <citerefentry><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 286                           <citerefentry><refentrytitle>cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 287                   </para>
 288         </refsect1>
 289
 290 </refentry>