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>
  64                 and
  65                 <citerefentry><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
  66
  67                 <para>For command line parameters understood by the
  68                 initial RAM disk, please see
  69                 <citerefentry><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
  70                 or the documentation of the specific initrd
  71                 implementation of your installation.</para>
  72         </refsect1>
  73
  74         <refsect1>
  75                 <title>Core OS Command Line Arguments</title>
  76
  77                 <variablelist class='kernel-commandline-options'>
  78                         <varlistentry>
  79                                 <term><varname>systemd.unit=</varname></term>
  80                                 <term><varname>rd.systemd.unit=</varname></term>
  81                                 <term><varname>systemd.dump_core=</varname></term>
  82                                 <term><varname>systemd.crash_shell=</varname></term>
  83                                 <term><varname>systemd.crash_chvt=</varname></term>
  84                                 <term><varname>systemd.confirm_spawn=</varname></term>
  85                                 <term><varname>systemd.show_status=</varname></term>
  86                                 <term><varname>systemd.log_target=</varname></term>
  87                                 <term><varname>systemd.log_level=</varname></term>
  88                                 <term><varname>systemd.log_color=</varname></term>
  89                                 <term><varname>systemd.log_location=</varname></term>
  90                                 <term><varname>systemd.default_standard_output=</varname></term>
  91                                 <term><varname>systemd.default_standard_error=</varname></term>
  92                                 <term><varname>systemd.setenv=</varname></term>
  93                                 <listitem>
  94                                         <para>Parameters understood by
  95                                         the system and service manager
  96                                         to control system behavior. For details, see
  97                                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
  98                                 </listitem>
  99                         </varlistentry>
 100
 101                         <varlistentry>
 102                                 <term><varname>quiet</varname></term>
 103                                 <listitem>
 104                                         <para>Parameter understood by
 105                                         both the kernel and the system
 106                                         and service manager to control
 107                                         console log verbosity. For
 108                                         details, see
 109                                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
 110                                 </listitem>
 111                         </varlistentry>
 112
 113                         <varlistentry>
 114                                 <term><varname>debug</varname></term>
 115                                 <listitem>
 116                                         <para>Parameter understood by
 117                                         both the kernel and the system
 118                                         and service manager to control
 119                                         console log verbosity. For
 120                                         details, see
 121                                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
 122                                 </listitem>
 123                         </varlistentry>
 124
 125                         <varlistentry>
 126                                 <term><varname>emergency</varname></term>
 127                                 <term><varname>single</varname></term>
 128                                 <term><varname>s</varname></term>
 129                                 <term><varname>S</varname></term>
 130                                 <term><varname>1</varname></term>
 131                                 <term><varname>2</varname></term>
 132                                 <term><varname>3</varname></term>
 133                                 <term><varname>4</varname></term>
 134                                 <term><varname>5</varname></term>
 135                                 <listitem>
 136                                         <para>Parameters understood by
 137                                         the system and service
 138                                         manager, as compatibility
 139                                         options. For details, see
 140                                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
 141                                 </listitem>
 142                         </varlistentry>
 143
 144                         <varlistentry>
 145                                 <term><varname>locale.LANG=</varname></term>
 146                                 <term><varname>locale.LANGUAGE=</varname></term>
 147                                 <term><varname>locale.LC_CTYPE=</varname></term>
 148                                 <term><varname>locale.LC_NUMERIC=</varname></term>
 149                                 <term><varname>locale.LC_TIME=</varname></term>
 150                                 <term><varname>locale.LC_COLLATE=</varname></term>
 151                                 <term><varname>locale.LC_MONETARY=</varname></term>
 152                                 <term><varname>locale.LC_MESSAGES=</varname></term>
 153                                 <term><varname>locale.LC_PAPER=</varname></term>
 154                                 <term><varname>locale.LC_NAME=</varname></term>
 155                                 <term><varname>locale.LC_ADDRESS=</varname></term>
 156                                 <term><varname>locale.LC_TELEPHONE=</varname></term>
 157                                 <term><varname>locale.LC_MEASUREMENT=</varname></term>
 158                                 <term><varname>locale.LC_IDENTIFICATION=</varname></term>
 159                                 <listitem>
 160                                         <para>Parameters understood by
 161                                         the system and service manager
 162                                         to control locale and language
 163                                         settings. For details, see
 164                                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
 165                                 </listitem>
 166                         </varlistentry>
 167
 168                         <varlistentry>
 169                                 <term><varname>fsck.mode=</varname></term>
 170
 171                                 <listitem>
 172                                         <para>Parameter understood by
 173                                         the file system checker
 174                                         services. For details, see
 175                                         <citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 176                                 </listitem>
 177                         </varlistentry>
 178
 179                         <varlistentry>
 180                                 <term><varname>quotacheck.mode=</varname></term>
 181
 182                                 <listitem>
 183                                         <para>Parameter understood by
 184                                         the file quota checker
 185                                         service. For details, see
 186                                         <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 187                                 </listitem>
 188                         </varlistentry>
 189
 190                         <varlistentry>
 191                                 <term><varname>systemd.journald.forward_to_syslog=</varname></term>
 192                                 <term><varname>systemd.journald.forward_to_kmsg=</varname></term>
 193                                 <term><varname>systemd.journald.forward_to_console=</varname></term>
 194
 195                                 <listitem>
 196                                         <para>Parameters understood by
 197                                         the journal service. For
 198                                         details, see
 199                                         <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 200                                 </listitem>
 201                         </varlistentry>
 202
 203                         <varlistentry>
 204                                 <term><varname>vconsole.keymap=</varname></term>
 205                                 <term><varname>vconsole.keymap.toggle=</varname></term>
 206                                 <term><varname>vconsole.font=</varname></term>
 207                                 <term><varname>vconsole.font.map=</varname></term>
 208                                 <term><varname>vconsole.font.unimap=</varname></term>
 209
 210                                 <listitem>
 211                                         <para>Parameters understood by
 212                                         the virtual console setup logic. For
 213                                         details, see
 214                                         <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 215                                 </listitem>
 216                         </varlistentry>
 217
 218                         <varlistentry>
 219                                 <term><varname>udev.log-priority=</varname></term>
 220                                 <term><varname>rd.udev.log-priority=</varname></term>
 221                                 <term><varname>udev.children-max=</varname></term>
 222                                 <term><varname>rd.udev.children-max=</varname></term>
 223                                 <term><varname>udev.exec-delay=</varname></term>
 224                                 <term><varname>rd.udev.exec-delay=</varname></term>
 225                                 <term><varname>net.ifnames=</varname></term>
 226
 227                                 <listitem>
 228                                         <para>Parameters understood by
 229                                         the device event managing daemon. For
 230                                         details, see
 231                                         <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 232                                 </listitem>
 233                         </varlistentry>
 234
 235                         <varlistentry>
 236                                 <term><varname>plymouth.enable=</varname></term>
 237
 238                                 <listitem>
 239                                         <para>May be used to disable
 240                                         the Plymouth boot splash. For
 241                                         details, see
 242                                         <citerefentry><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 243                                 </listitem>
 244                         </varlistentry>
 245
 246                         <varlistentry>
 247                                 <term><varname>luks=</varname></term>
 248                                 <term><varname>rd.luks=</varname></term>
 249                                 <term><varname>luks.crypttab=</varname></term>
 250                                 <term><varname>rd.luks.crypttab=</varname></term>
 251                                 <term><varname>luks.uuid=</varname></term>
 252                                 <term><varname>rd.luks.uuid=</varname></term>
 253                                 <term><varname>luks.key=</varname></term>
 254                                 <term><varname>rd.luks.key=</varname></term>
 255
 256                                 <listitem>
 257                                         <para>Configures the LUKS
 258                                         full-disk encryption logic at
 259                                         boot. For details, see
 260                                         <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 261                                 </listitem>
 262                         </varlistentry>
 263
 264                         <varlistentry>
 265                                 <term><varname>fstab=</varname></term>
 266                                 <term><varname>rd.fstab=</varname></term>
 267
 268                                 <listitem>
 269                                         <para>Configures the
 270                                         <filename>/etc/fstab</filename>
 271                                         logic at boot. For details, see
 272                                         <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 273                                 </listitem>
 274                         </varlistentry>
 275
 276                         <varlistentry>
 277                                 <term><varname>modules-load=</varname></term>
 278                                 <term><varname>rd.modules-load=</varname></term>
 279
 280                                 <listitem>
 281                                         <para>Load a specific kernel
 282                                         module early at boot. For
 283                                         details, see
 284                                         <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 285                                 </listitem>
 286                         </varlistentry>
 287
 288                 </variablelist>
 289
 290         </refsect1>
 291
 292         <refsect1>
 293                   <title>See Also</title>
 294                   <para>
 295                           <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 296                           <citerefentry><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 297                           <citerefentry><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 298                           <citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 299                           <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 300                           <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 301                           <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 302                           <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 303                           <citerefentry><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 304                           <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 305                           <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 306                           <citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 307                   </para>
 308         </refsect1>
 309
 310 </refentry>