man/kernel-command-line.xml

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   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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   8   Copyright 2012 Lennart Poettering
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  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.log_target=</varname></term>
  84                                 <term><varname>systemd.log_level=</varname></term>
  85                                 <term><varname>systemd.log_color=</varname></term>
  86                                 <term><varname>systemd.log_location=</varname></term>
  87                                 <term><varname>systemd.default_standard_output=</varname></term>
  88                                 <term><varname>systemd.default_standard_error=</varname></term>
  89                                 <term><varname>systemd.setenv=</varname></term>
  90                                 <listitem>
  91                                         <para>Parameters understood by
  92                                         the system and service manager
  93                                         to control system behaviour. For details see
  94                                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
  95                                 </listitem>
  96                         </varlistentry>
  97
  98                         <varlistentry>
  99                                 <term><varname>quiet</varname></term>
 100                                 <listitem>
 101                                         <para>Parameter understood by
 102                                         both the kernel and the system
 103                                         and service manager to control
 104                                         console log verbosity. For
 105                                         details see
 106                                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
 107                                 </listitem>
 108                         </varlistentry>
 109
 110                         <varlistentry>
 111                                 <term><varname>emergency</varname></term>
 112                                 <term><varname>single</varname></term>
 113                                 <term><varname>s</varname></term>
 114                                 <term><varname>S</varname></term>
 115                                 <term><varname>1</varname></term>
 116                                 <term><varname>2</varname></term>
 117                                 <term><varname>3</varname></term>
 118                                 <term><varname>4</varname></term>
 119                                 <term><varname>5</varname></term>
 120                                 <listitem>
 121                                         <para>Parameters understood by
 122                                         the system and service
 123                                         manager, as compatibility
 124                                         options. For details see
 125                                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
 126                                 </listitem>
 127                         </varlistentry>
 128
 129                         <varlistentry>
 130                                 <term><varname>locale.LANG=</varname></term>
 131                                 <term><varname>locale.LANGUAGE=</varname></term>
 132                                 <term><varname>locale.LC_CTYPE=</varname></term>
 133                                 <term><varname>locale.LC_NUMERIC=</varname></term>
 134                                 <term><varname>locale.LC_TIME=</varname></term>
 135                                 <term><varname>locale.LC_COLLATE=</varname></term>
 136                                 <term><varname>locale.LC_MONETARY=</varname></term>
 137                                 <term><varname>locale.LC_MESSAGES=</varname></term>
 138                                 <term><varname>locale.LC_PAPER=</varname></term>
 139                                 <term><varname>locale.LC_NAME=</varname></term>
 140                                 <term><varname>locale.LC_ADDRESS=</varname></term>
 141                                 <term><varname>locale.LC_TELEPHONE=</varname></term>
 142                                 <term><varname>locale.LC_MEASUREMENT=</varname></term>
 143                                 <term><varname>locale.LC_IDENTIFICATION=</varname></term>
 144                                 <listitem>
 145                                         <para>Parameters understood by
 146                                         the system and service manager
 147                                         to control locale and language
 148                                         settings. For details see
 149                                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
 150                                 </listitem>
 151                         </varlistentry>
 152
 153                         <varlistentry>
 154                                 <term><varname>fsck.mode=</varname></term>
 155
 156                                 <listitem>
 157                                         <para>Parameter understood by
 158                                         the file system checker
 159                                         services. For details see
 160                                         <citerefentry><refentrytitle>fsck-root.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 161                                 </listitem>
 162                         </varlistentry>
 163
 164                         <varlistentry>
 165                                 <term><varname>quotacheck.mode=</varname></term>
 166
 167                                 <listitem>
 168                                         <para>Parameter understood by
 169                                         the file quota checker
 170                                         service. For details see
 171                                         <citerefentry><refentrytitle>quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 172                                 </listitem>
 173                         </varlistentry>
 174
 175                         <varlistentry>
 176                                 <term><varname>systemd.journald.forward_to_syslog=</varname></term>
 177                                 <term><varname>systemd.journald.forward_to_kmsg=</varname></term>
 178                                 <term><varname>systemd.journald.forward_to_console=</varname></term>
 179
 180                                 <listitem>
 181                                         <para>Parameters understood by
 182                                         the journal service. For
 183                                         details see
 184                                         <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 185                                 </listitem>
 186                         </varlistentry>
 187
 188                         <varlistentry>
 189                                 <term><varname>vconsole.keymap=</varname></term>
 190                                 <term><varname>vconsole.keymap.toggle=</varname></term>
 191                                 <term><varname>vconsole.font=</varname></term>
 192                                 <term><varname>vconsole.font.map=</varname></term>
 193                                 <term><varname>vconsole.font.unimap=</varname></term>
 194
 195                                 <listitem>
 196                                         <para>Parameters understood by
 197                                         the virtual console setup logic. For
 198                                         details see
 199                                         <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 200                                 </listitem>
 201                         </varlistentry>
 202
 203                         <varlistentry>
 204                                 <term><varname>udev.log-priority=</varname></term>
 205                                 <term><varname>rd.udev.log-priority=</varname></term>
 206                                 <term><varname>udev.children-max=</varname></term>
 207                                 <term><varname>rd.udev.children-max=</varname></term>
 208                                 <term><varname>udev.exec-delay=</varname></term>
 209                                 <term><varname>rd.udev.exec-delay=</varname></term>
 210
 211                                 <listitem>
 212                                         <para>Parameters understood by
 213                                         the device event managing daemon. For
 214                                         details see
 215                                         <citerefentry><refentrytitle>systemd-udevd</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 216                                 </listitem>
 217                         </varlistentry>
 218
 219                         <varlistentry>
 220                                 <term><varname>plymouth.enable=</varname></term>
 221
 222                                 <listitem>
 223                                         <para>May be used to disable
 224                                         the Plymouth boot splash. For
 225                                         details see
 226                                         <citerefentry><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 227                                 </listitem>
 228                         </varlistentry>
 229
 230                         <varlistentry>
 231                                 <term><varname>luks=</varname></term>
 232                                 <term><varname>rd.luks=</varname></term>
 233                                 <term><varname>luks.crypttab=</varname></term>
 234                                 <term><varname>rd.luks.crypttab=</varname></term>
 235                                 <term><varname>luks.uuid=</varname></term>
 236                                 <term><varname>rd.luks.uuid=</varname></term>
 237
 238                                 <listitem>
 239                                         <para>Configures the LUKS
 240                                         full-disk encryption logic at
 241                                         boot. For details see
 242                                         <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 243                                 </listitem>
 244                         </varlistentry>
 245
 246                         <varlistentry>
 247                                 <term><varname>fstab=</varname></term>
 248                                 <term><varname>rd.fstab=</varname></term>
 249
 250                                 <listitem>
 251                                         <para>Configures the
 252                                         <filename>/etc/fstab</filename>
 253                                         logic at boot. For details see
 254                                         <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 255                                 </listitem>
 256                         </varlistentry>
 257
 258                         <varlistentry>
 259                                 <term><varname>driver=</varname></term>
 260                                 <term><varname>rd.driver=</varname></term>
 261
 262                                 <listitem>
 263                                         <para>Load a specific kernel
 264                                         boot early at boot. For
 265                                         details see
 266                                         <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 267                                 </listitem>
 268                         </varlistentry>
 269
 270                 </variablelist>
 271
 272         </refsect1>
 273
 274         <refsect1>
 275                   <title>See Also</title>
 276                   <para>
 277                           <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 278                           <citerefentry><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 279                           <citerefentry><refentrytitle>fsck-root.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 280                           <citerefentry><refentrytitle>quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 281                           <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 282                           <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 283                           <citerefentry><refentrytitle>systemd-udevd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 284                           <citerefentry><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 285                           <citerefentry><refentrytitle>cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 286                   </para>
 287         </refsect1>
 288
 289 </refentry>