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diff --git a/man/kernel-command-line.xml b/man/kernel-command-line.xml new file mode 100644 index 0000000..6ac20ad --- /dev/null +++ b/man/kernel-command-line.xml @@ -0,0 +1,740 @@ +<?xml version='1.0'?> <!--*-nxml-*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" + "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> +<!-- SPDX-License-Identifier: LGPL-2.1-or-later --> + +<refentry id="kernel-command-line" xmlns:xi="http://www.w3.org/2001/XInclude"> + + <refentryinfo> + <title>kernel-command-line</title> + <productname>systemd</productname> + </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 programs running in the initrd and in the host system may be configured at boot via + kernel command line arguments. In addition, various systemd tools look at the EFI variable + <literal>SystemdOptions</literal> (if available). Both sources are combined, but the kernel command line + has higher priority. Please note that <emphasis>the EFI variable is only used by systemd tools, and is + ignored by the kernel and other user space tools</emphasis>, so it is not a replacement for the kernel + command line.</para> + + <para>For command line parameters understood by the kernel, please + see + <ulink url="https://docs.kernel.org/admin-guide/kernel-parameters.html"><filename>kernel-parameters.html</filename></ulink> + and + <citerefentry project='man-pages'><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para> + + <para>For command line parameters understood by the initrd, see + <citerefentry project='man-pages'><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_chvt</varname></term> + <term><varname>systemd.crash_shell</varname></term> + <term><varname>systemd.crash_reboot</varname></term> + <term><varname>systemd.confirm_spawn</varname></term> + <term><varname>systemd.service_watchdogs</varname></term> + <term><varname>systemd.show_status</varname></term> + <term><varname>systemd.status_unit_format=</varname></term> + <term><varname>systemd.log_target=</varname></term> + <term><varname>systemd.log_level=</varname></term> + <term><varname>systemd.log_location=</varname></term> + <term><varname>systemd.log_color</varname></term> + <term><varname>systemd.log_ratelimit_kmsg</varname></term> + <term><varname>systemd.default_standard_output=</varname></term> + <term><varname>systemd.default_standard_error=</varname></term> + <term><varname>systemd.setenv=</varname></term> + <term><varname>systemd.machine_id=</varname></term> + <term><varname>systemd.set_credential=</varname></term> + <term><varname>systemd.set_credential_binary=</varname></term> + <term><varname>systemd.import_credentials=</varname></term> + <term><varname>systemd.reload_limit_interval_sec=</varname></term> + <term><varname>systemd.reload_limit_burst=</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> + + <xi:include href="version-info.xml" xpointer="v186"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.mask=</varname></term> + <term><varname>systemd.wants=</varname></term> + <term><varname>systemd.debug_shell</varname></term> + <listitem> + <para>Additional parameters understood by + <citerefentry><refentrytitle>systemd-debug-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + to mask or start specific units at boot, or invoke a debug + shell on tty9.</para> + + <xi:include href="version-info.xml" xpointer="v215"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.run=</varname></term> + <term><varname>systemd.run_success_action=</varname></term> + <term><varname>systemd.run_failure_action=</varname></term> + <listitem> + <para>Additional parameters understood by + <citerefentry><refentrytitle>systemd-run-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, to + run a command line specified on the kernel command line as system service after booting up.</para> + + <xi:include href="version-info.xml" xpointer="v240"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.early_core_pattern=</varname></term> + <listitem> + <para>During early boot, the generation of core dump files is disabled until a core dump handler (if any) + takes over. This parameter allows specifying an absolute path where core dump files should be stored until + a handler is installed. The path should be absolute and may contain specifiers, see + <citerefentry project='man-pages'><refentrytitle>core</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details.</para> + + <xi:include href="version-info.xml" xpointer="v240"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.restore_state=</varname></term> + <listitem> + <para>This parameter is 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> + + <xi:include href="version-info.xml" xpointer="v209"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.volatile=</varname></term> + <listitem> + <para>This parameter controls whether the system shall boot up in volatile mode. Takes a boolean argument, or + the special value <literal>state</literal>. If false (the default), normal boot mode is selected, the root + directory and <filename>/var/</filename> are mounted as specified on the kernel command line or + <filename>/etc/fstab</filename>, or otherwise configured. If true, full state-less boot mode is selected. In + this case the root directory is mounted as volatile memory file system (<literal>tmpfs</literal>), and only + <filename>/usr/</filename> is mounted from the file system configured as root device, in read-only mode. This + enables fully state-less boots were the vendor-supplied OS is used as shipped, with only default + configuration and no stored state in effect, as <filename>/etc/</filename> and <filename>/var/</filename> (as + well as all other resources shipped in the root file system) are reset at boot and lost on shutdown. If this + setting is set to <literal>state</literal> the root file system is mounted read-only, however + <filename>/var/</filename> is mounted as a volatile memory file system (<literal>tmpfs</literal>), so that the + system boots up with the normal configuration applied, but all state reset at boot and lost at shutdown. If + this setting is set to <literal>overlay</literal> the root file system is set up as + <literal>overlayfs</literal> mount combining the read-only root directory with a writable + <literal>tmpfs</literal>, so that no modifications are made to disk, but the file system may be modified + nonetheless with all changes being lost at reboot. For details, see + <citerefentry><refentrytitle>systemd-volatile-root.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> + and + <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v233"/> + </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> + + <xi:include href="version-info.xml" xpointer="v186"/> + </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> + + <xi:include href="version-info.xml" xpointer="v205"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>-b</varname></term> + <term><varname>rd.emergency</varname></term> + <term><varname>emergency</varname></term> + <term><varname>rd.rescue</varname></term> + <term><varname>rescue</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 and convenience options. For details, see + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v186"/> + </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> + + <xi:include href="version-info.xml" xpointer="v186"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>fsck.mode=</varname></term> + <term><varname>fsck.repair=</varname></term> + + <listitem> + <para>Parameters understood by the file system checker + services. For details, see + <citerefentry><refentrytitle>systemd-fsck@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v186"/> + </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> + + <xi:include href="version-info.xml" xpointer="v186"/> + </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> + <term><varname>systemd.journald.forward_to_wall=</varname></term> + + <listitem> + <para>Parameters understood by the journal service. For + details, see + <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v186"/> + </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>vconsole.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v186"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>udev.log_level=</varname></term> + <term><varname>rd.udev.log_level=</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>udev.event_timeout=</varname></term> + <term><varname>rd.udev.event_timeout=</varname></term> + <term><varname>udev.timeout_signal=</varname></term> + <term><varname>rd.udev.timeout_signal=</varname></term> + <term><varname>udev.blockdev_read_only</varname></term> + <term><varname>rd.udev.blockdev_read_only</varname></term> + <term><varname>net.ifnames=</varname></term> + <term><varname>net.naming-scheme=</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> + + <xi:include href="version-info.xml" xpointer="v186"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>plymouth.enable=</varname></term> + + <listitem> + <para>May be used to disable the Plymouth boot splash. For + details, see + <citerefentry project='die-net'><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v186"/> + </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.name=</varname></term> + <term><varname>rd.luks.name=</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> + + <xi:include href="version-info.xml" xpointer="v186"/> + </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> + + <xi:include href="version-info.xml" xpointer="v186"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>root=</varname></term> + <term><varname>rootfstype=</varname></term> + <term><varname>rootflags=</varname></term> + <term><varname>ro</varname></term> + <term><varname>rw</varname></term> + + <listitem> + <para>Configures the root file system and its file system type and mount options, as well as + whether it shall be mounted read-only or read-write initially. For details, see + <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> + + <para>If <varname>root=</varname> is not set (or set to <literal>gpt-auto</literal>) the automatic + root partition discovery implemented by + <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry> + will be in effect. In this case <varname>rootfstype=</varname>, <varname>rootflags=</varname>, + <varname>ro</varname>, <varname>rw</varname> will be interpreted by + <command>systemd-gpt-auto-generator</command>.</para> + + <xi:include href="version-info.xml" xpointer="v215"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>mount.usr=</varname></term> + <term><varname>mount.usrfstype=</varname></term> + <term><varname>mount.usrflags=</varname></term> + + <listitem> + <para>Configures the /usr file system (if required) and + its file system type and mount options. For details, see + <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v235"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>veritytab=</varname></term> + <term><varname>rd.veritytab=</varname></term> + <term><varname>roothash=</varname></term> + <term><varname>systemd.verity=</varname></term> + <term><varname>rd.systemd.verity=</varname></term> + <term><varname>systemd.verity_root_data=</varname></term> + <term><varname>systemd.verity_root_hash=</varname></term> + <term><varname>systemd.verity.root_options=</varname></term> + <term><varname>usrhash=</varname></term> + <term><varname>systemd.verity_usr_data=</varname></term> + <term><varname>systemd.verity_usr_hash=</varname></term> + <term><varname>systemd.verity_usr_options=</varname></term> + <listitem> + <para>Configures the integrity protection root hash for the root and <filename>/usr</filename> file systems, and other related + parameters. For details, see + <citerefentry><refentrytitle>systemd-veritysetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v233"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.getty_auto=</varname></term> + + <listitem> + <para>Configures whether the <filename>serial-getty@.service</filename> will run. + For details, see + <citerefentry><refentrytitle>systemd-getty-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v250"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.gpt_auto=</varname></term> + <term><varname>rd.systemd.gpt_auto=</varname></term> + + <listitem> + <para>Configures whether GPT-based partition auto-discovery shall be attempted. For details, see + <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v215"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.image_policy=</varname></term> + <term><varname>rd.systemd.image_policy=</varname></term> + + <listitem><para>When GPT-based partition auto-discovery is used, configures the image dissection + policy string to apply, as per + <citerefentry><refentrytitle>systemd.image-policy</refentrytitle><manvolnum>7</manvolnum></citerefentry>. For + details see + <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v254"/></listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.default_timeout_start_sec=</varname></term> + + <listitem> + <para>Overrides the default start job timeout <varname>DefaultTimeoutStartSec=</varname> at + boot. For details, see + <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v230"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.default_device_timeout_sec=</varname></term> + + <listitem> + <para>Overrides the default device timeout <varname>DefaultDeviceTimeoutSec=</varname> at boot. For + details, see + <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v254"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.watchdog_device=</varname></term> + + <listitem> + <para>Overrides the watchdog device path <varname>WatchdogDevice=</varname>. For details, see + <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v236"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.watchdog_sec=</varname></term> + + <listitem> + <para>Overrides the watchdog timeout settings otherwise configured with + <varname>RuntimeWatchdog=</varname>, <varname>RebootWatchdog=</varname> and + <varname>KExecWatchdogSec=</varname>. Takes a time value (if no unit is specified, seconds is the + implicitly assumed time unit) or the special strings <literal>off</literal> or + <literal>default</literal>. For details, see + <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v250"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.watchdog_pre_sec=</varname></term> + + <listitem> + <para>Overrides the watchdog pre-timeout settings otherwise configured with + <varname>RuntimeWatchdogPreSec=</varname>. Takes a time value (if no unit is specified, seconds is the + implicitly assumed time unit) or the special strings <literal>off</literal> or + <literal>default</literal>. For details, see + <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v251"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.watchdog_pretimeout_governor=</varname></term> + + <listitem> + <para>Overrides the watchdog pre-timeout settings otherwise configured with + <varname>RuntimeWatchdogPreGovernor=</varname>. Takes a string value. For details, see + <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v251"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.cpu_affinity=</varname></term> + + <listitem> + <para>Overrides the CPU affinity mask for the service manager and the default for all child + processes it forks. This takes precedence over <varname>CPUAffinity=</varname>, see + <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> + for details.</para> + + <xi:include href="version-info.xml" xpointer="v245"/> + </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> + + <xi:include href="version-info.xml" xpointer="v187"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>nameserver=</varname></term> + <term><varname>domain=</varname></term> + + <listitem><para>Configures DNS server information and search domains, see + <citerefentry><refentrytitle>systemd-resolved.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> + for details.</para> + + <xi:include href="version-info.xml" xpointer="v253"/></listitem> + </varlistentry> + + <varlistentry> + <term><varname>resume=</varname></term> + <term><varname>resumeflags=</varname></term> + + <listitem> + <para>Enables resume from hibernation using the specified + device and mount options. All + <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>-like + paths are supported. For details, see + <citerefentry><refentrytitle>systemd-hibernate-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v217"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.firstboot=</varname></term> + + <listitem><para>Takes a boolean argument, defaults to on. If off, + <citerefentry><refentrytitle>systemd-firstboot.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> + will not query the user for basic system settings, even if the system boots up for the first time and + the relevant settings are not initialized yet. Not to be confused with + <varname>systemd.condition-first-boot=</varname> (see below), which overrides the result of the + <varname>ConditionFirstBoot=</varname> unit file condition, and thus controls more than just + <filename>systemd-firstboot.service</filename> behaviour.</para> + + <xi:include href="version-info.xml" xpointer="v233"/></listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.condition-needs-update=</varname></term> + + <listitem><para>Takes a boolean argument. If specified, overrides the result of + <varname>ConditionNeedsUpdate=</varname> unit condition checks. See + <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for + details.</para> + + <xi:include href="version-info.xml" xpointer="v246"/></listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.condition-first-boot=</varname></term> + + <listitem><para>Takes a boolean argument. If specified, overrides the result of + <varname>ConditionFirstBoot=</varname> unit condition checks. See + <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for + details. Not to be confused with <varname>systemd.firstboot=</varname> which only controls behaviour + of the <filename>systemd-firstboot.service</filename> system service but has no effect on the + condition check (see above).</para> + + <xi:include href="version-info.xml" xpointer="v246"/></listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.clock-usec=</varname></term> + + <listitem><para>Takes a decimal, numeric timestamp in μs since January 1st 1970, 00:00am, to set the + system clock to. The system time is set to the specified timestamp early during boot. It is not + propagated to the hardware clock (RTC).</para> + + <xi:include href="version-info.xml" xpointer="v246"/></listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.random-seed=</varname></term> + + <listitem><para>Takes a base64 encoded random seed value to credit with full entropy to the kernel's + random pool during early service manager initialization. This option is useful in testing + environments where delays due to random pool initialization in entropy starved virtual machines shall + be avoided.</para> + + <para>Note that if this option is used the seed is accessible to unprivileged programs from + <filename>/proc/cmdline</filename>. This option is hence a security risk when used outside of test + systems, since the (possibly) only seed used for initialization of the kernel's entropy pool might be + easily acquired by unprivileged programs.</para> + + <para>It is recommended to pass 512 bytes of randomized data (as that matches the Linux kernel pool + size), which may be generated with a command like the following:</para> + + <programlisting>dd if=/dev/urandom bs=512 count=1 status=none | base64 -w 0</programlisting> + + <para>Again: do not use this option outside of testing environments, it's a security risk elsewhere, + as secret key material derived from the entropy pool can possibly be reconstructed by unprivileged + programs.</para> + + <xi:include href="version-info.xml" xpointer="v246"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.hostname=</varname></term> + + <listitem><para>Accepts a hostname to set during early boot. If specified takes precedence over what + is set in <filename>/etc/hostname</filename>. Note that this does not bar later runtime changes to + the hostname, it simply controls the initial hostname set during early boot.</para> + + <xi:include href="version-info.xml" xpointer="v246"/></listitem> + </varlistentry> + + <varlistentry> + <term><varname>systemd.tty.term.<replaceable>tty</replaceable>=</varname></term> + <term><varname>systemd.tty.rows.<replaceable>tty</replaceable>=</varname></term> + <term><varname>systemd.tty.columns.<replaceable>tty</replaceable>=</varname></term> + + <listitem><para>These arguments allow configuring default values for <varname>$TERM</varname>, + <varname>TTYRows=</varname>, and <varname>TTYColumns=</varname> for tty + <replaceable>tty</replaceable>. Additionally, <varname>systemd.tty.term.console</varname> will + configure the <varname>$TERM</varname> value used by <command>systemd</command> if not set explicitly + using <varname>TERM</varname> on the kernel command line. The tty name should be specified without + the <filename>/dev/</filename> prefix (e.g. <literal>systemd.tty.rows.ttyS0=80</literal>). + </para> + + <xi:include href="version-info.xml" xpointer="v254"/></listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>History</title> + + <variablelist> + <varlistentry> + <term>systemd 252</term> + <listitem><para>Kernel command-line arguments <varname>systemd.unified_cgroup_hierarchy</varname> + and <varname>systemd.legacy_systemd_cgroup_controller</varname> were deprecated. Please switch to + the unified cgroup hierarchy.</para> + + <xi:include href="version-info.xml" xpointer="v252"/></listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>See Also</title> + <para> + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry project='man-pages'><refentrytitle>bootparam</refentrytitle><manvolnum>7</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.system-credentials</refentrytitle><manvolnum>7</manvolnum></citerefentry> + <citerefentry><refentrytitle>smbios-type-11</refentrytitle><manvolnum>7</manvolnum></citerefentry>, + <citerefentry project='man-pages'><refentrytitle>dracut.cmdline</refentrytitle><manvolnum>7</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd-debug-generator</refentrytitle><manvolnum>8</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 project='die-net'><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd-veritysetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd-getty-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd-volatile-root.service</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>, + <citerefentry><refentrytitle>systemd-hibernate-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd-firstboot.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>bootctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |