295edddf5a
When set to 0 this will stop tools like the backlight and rfkill tools to restore state from previous boot. This is useful in case the stored state is bogus to the extent that it is preventing you from resetting it (e.g., the backlight settings cause the screen to be off on boot on a system where the backlight can not be adjusted directly from the keyboard).
331 lines
19 KiB
XML
331 lines
19 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
|
|
<!--
|
|
This file is part of systemd.
|
|
|
|
Copyright 2012 Lennart Poettering
|
|
|
|
systemd is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
systemd is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
-->
|
|
|
|
<refentry id="kernel-command-line">
|
|
|
|
<refentryinfo>
|
|
<title>kernel-command-line</title>
|
|
<productname>systemd</productname>
|
|
|
|
<authorgroup>
|
|
<author>
|
|
<contrib>Developer</contrib>
|
|
<firstname>Lennart</firstname>
|
|
<surname>Poettering</surname>
|
|
<email>lennart@poettering.net</email>
|
|
</author>
|
|
</authorgroup>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>kernel-command-line</refentrytitle>
|
|
<manvolnum>7</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>kernel-command-line</refname>
|
|
<refpurpose>Kernel command line parameters</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<para><filename>/proc/cmdline</filename></para>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para>The kernel, the initial RAM disk (initrd) and
|
|
basic userspace functionality may be configured at boot via
|
|
kernel command line arguments.</para>
|
|
|
|
<para>For command line parameters understood by the
|
|
kernel, please see <ulink
|
|
url="https://www.kernel.org/doc/Documentation/kernel-parameters.txt"><filename>kernel-parameters.txt</filename></ulink>
|
|
and
|
|
<citerefentry><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
|
|
|
|
<para>For command line parameters understood by the
|
|
initial RAM disk, please see
|
|
<citerefentry><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
|
or the documentation of the specific initrd
|
|
implementation of your installation.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Core OS Command Line Arguments</title>
|
|
|
|
<variablelist class='kernel-commandline-options'>
|
|
<varlistentry>
|
|
<term><varname>systemd.unit=</varname></term>
|
|
<term><varname>rd.systemd.unit=</varname></term>
|
|
<term><varname>systemd.dump_core=</varname></term>
|
|
<term><varname>systemd.crash_shell=</varname></term>
|
|
<term><varname>systemd.crash_chvt=</varname></term>
|
|
<term><varname>systemd.confirm_spawn=</varname></term>
|
|
<term><varname>systemd.show_status=</varname></term>
|
|
<term><varname>systemd.log_target=</varname></term>
|
|
<term><varname>systemd.log_level=</varname></term>
|
|
<term><varname>systemd.log_color=</varname></term>
|
|
<term><varname>systemd.log_location=</varname></term>
|
|
<term><varname>systemd.default_standard_output=</varname></term>
|
|
<term><varname>systemd.default_standard_error=</varname></term>
|
|
<term><varname>systemd.setenv=</varname></term>
|
|
<listitem>
|
|
<para>Parameters understood by
|
|
the system and service manager
|
|
to control system behavior. For details, see
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>systemd.restore_state=</varname></term>
|
|
<listitem>
|
|
<para>Parameter understood by
|
|
several system tools to control
|
|
whether or not they should restore
|
|
system state from the previous boot.
|
|
For details, see
|
|
<citerefentry><refentrytitle>systemd-backlight@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
and
|
|
<citerefentry><refentrytitle>systemd-rfkill@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>quiet</varname></term>
|
|
<listitem>
|
|
<para>Parameter understood by
|
|
both the kernel and the system
|
|
and service manager to control
|
|
console log verbosity. For
|
|
details, see
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>debug</varname></term>
|
|
<listitem>
|
|
<para>Parameter understood by
|
|
both the kernel and the system
|
|
and service manager to control
|
|
console log verbosity. For
|
|
details, see
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>-b</varname></term>
|
|
<term><varname>emergency</varname></term>
|
|
<term><varname>single</varname></term>
|
|
<term><varname>s</varname></term>
|
|
<term><varname>S</varname></term>
|
|
<term><varname>1</varname></term>
|
|
<term><varname>2</varname></term>
|
|
<term><varname>3</varname></term>
|
|
<term><varname>4</varname></term>
|
|
<term><varname>5</varname></term>
|
|
<listitem>
|
|
<para>Parameters understood by
|
|
the system and service
|
|
manager, as compatibility
|
|
options. For details, see
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>locale.LANG=</varname></term>
|
|
<term><varname>locale.LANGUAGE=</varname></term>
|
|
<term><varname>locale.LC_CTYPE=</varname></term>
|
|
<term><varname>locale.LC_NUMERIC=</varname></term>
|
|
<term><varname>locale.LC_TIME=</varname></term>
|
|
<term><varname>locale.LC_COLLATE=</varname></term>
|
|
<term><varname>locale.LC_MONETARY=</varname></term>
|
|
<term><varname>locale.LC_MESSAGES=</varname></term>
|
|
<term><varname>locale.LC_PAPER=</varname></term>
|
|
<term><varname>locale.LC_NAME=</varname></term>
|
|
<term><varname>locale.LC_ADDRESS=</varname></term>
|
|
<term><varname>locale.LC_TELEPHONE=</varname></term>
|
|
<term><varname>locale.LC_MEASUREMENT=</varname></term>
|
|
<term><varname>locale.LC_IDENTIFICATION=</varname></term>
|
|
<listitem>
|
|
<para>Parameters understood by
|
|
the system and service manager
|
|
to control locale and language
|
|
settings. For details, see
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>fsck.mode=</varname></term>
|
|
|
|
<listitem>
|
|
<para>Parameter understood by
|
|
the file system checker
|
|
services. For details, see
|
|
<citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>quotacheck.mode=</varname></term>
|
|
|
|
<listitem>
|
|
<para>Parameter understood by
|
|
the file quota checker
|
|
service. For details, see
|
|
<citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>systemd.journald.forward_to_syslog=</varname></term>
|
|
<term><varname>systemd.journald.forward_to_kmsg=</varname></term>
|
|
<term><varname>systemd.journald.forward_to_console=</varname></term>
|
|
|
|
<listitem>
|
|
<para>Parameters understood by
|
|
the journal service. For
|
|
details, see
|
|
<citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>vconsole.keymap=</varname></term>
|
|
<term><varname>vconsole.keymap.toggle=</varname></term>
|
|
<term><varname>vconsole.font=</varname></term>
|
|
<term><varname>vconsole.font.map=</varname></term>
|
|
<term><varname>vconsole.font.unimap=</varname></term>
|
|
|
|
<listitem>
|
|
<para>Parameters understood by
|
|
the virtual console setup logic. For
|
|
details, see
|
|
<citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>udev.log-priority=</varname></term>
|
|
<term><varname>rd.udev.log-priority=</varname></term>
|
|
<term><varname>udev.children-max=</varname></term>
|
|
<term><varname>rd.udev.children-max=</varname></term>
|
|
<term><varname>udev.exec-delay=</varname></term>
|
|
<term><varname>rd.udev.exec-delay=</varname></term>
|
|
<term><varname>net.ifnames=</varname></term>
|
|
|
|
<listitem>
|
|
<para>Parameters understood by
|
|
the device event managing daemon. For
|
|
details, see
|
|
<citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>plymouth.enable=</varname></term>
|
|
|
|
<listitem>
|
|
<para>May be used to disable
|
|
the Plymouth boot splash. For
|
|
details, see
|
|
<citerefentry><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>luks=</varname></term>
|
|
<term><varname>rd.luks=</varname></term>
|
|
<term><varname>luks.crypttab=</varname></term>
|
|
<term><varname>rd.luks.crypttab=</varname></term>
|
|
<term><varname>luks.uuid=</varname></term>
|
|
<term><varname>rd.luks.uuid=</varname></term>
|
|
<term><varname>luks.options=</varname></term>
|
|
<term><varname>rd.luks.options=</varname></term>
|
|
<term><varname>luks.key=</varname></term>
|
|
<term><varname>rd.luks.key=</varname></term>
|
|
|
|
<listitem>
|
|
<para>Configures the LUKS
|
|
full-disk encryption logic at
|
|
boot. For details, see
|
|
<citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>fstab=</varname></term>
|
|
<term><varname>rd.fstab=</varname></term>
|
|
|
|
<listitem>
|
|
<para>Configures the
|
|
<filename>/etc/fstab</filename>
|
|
logic at boot. For details, see
|
|
<citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>modules-load=</varname></term>
|
|
<term><varname>rd.modules-load=</varname></term>
|
|
|
|
<listitem>
|
|
<para>Load a specific kernel
|
|
module early at boot. For
|
|
details, see
|
|
<citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
</variablelist>
|
|
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
<citerefentry><refentrytitle>systemd-backlight@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
<citerefentry><refentrytitle>systemd-rfkill@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|