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NAME | SYNOPSIS | DESCRIPTION | CORE OS COMMAND LINE ARGUMENTS | SEE ALSO | NOTES | COLOPHON |
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KERNEL-COMMAND-LINE(7) kernel-command-line KERNEL-COMMAND-LINE(7)
kernel-command-line - Kernel command line parameters
/proc/cmdline
The kernel, the initial RAM disk (initrd) and basic userspace
functionality may be configured at boot via kernel command line
arguments.
For command line parameters understood by the kernel, please see
kernel-parameters.html[1] and bootparam(7).
For command line parameters understood by the initial RAM disk,
please see dracut.cmdline(7), or the documentation of the specific
initrd implementation of your installation.
systemd.unit=, rd.systemd.unit=, systemd.dump_core,
systemd.crash_chvt, systemd.crash_shell, systemd.crash_reboot,
systemd.confirm_spawn, systemd.show_status, systemd.log_target=,
systemd.log_level=, systemd.log_location=, systemd.log_color,
systemd.default_standard_output=, systemd.default_standard_error=,
systemd.setenv=, systemd.machine_id=,
systemd.unified_cgroup_hierarchy,
systemd.legacy_systemd_cgroup_controller
Parameters understood by the system and service manager to
control system behavior. For details, see systemd(1).
systemd.mask=, systemd.wants=, systemd.debug_shell
Additional parameters understood by systemd-debug-generator(8),
to mask or start specific units at boot, or invoke a debug shell
on tty9.
systemd.restore_state=
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 systemd-backlight@.service(8) and
systemd-rfkill.service(8).
systemd.volatile=
This parameter controls whether the system shall boot up in
volatile mode. Takes a boolean argument, or the special value
"state". If false (the default), normal boot mode is selected,
the root directory and /var are mounted as specified on the
kernel command line or /etc/fstab, 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
("tmpfs"), and only /usr 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
/etc and /var (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 "state" the root file system is mounted as
usual, however /var is mounted as a volatile memory file system
("tmpfs"), so that the system boots up with the normal
configuration applied, but all state reset at boot and lost at
shutdown. For details, see systemd-volatile-root.service(8) and
systemd-fstab-generator(8).
quiet
Parameter understood by both the kernel and the system and
service manager to control console log verbosity. For details,
see systemd(1).
debug
Parameter understood by both the kernel and the system and
service manager to control console log verbosity. For details,
see systemd(1).
-b, rd.emergency, emergency, rd.rescue, rescue, single, s, S, 1, 2,
3, 4, 5
Parameters understood by the system and service manager, as
compatibility and convenience options. For details, see
systemd(1).
locale.LANG=, locale.LANGUAGE=, locale.LC_CTYPE=, locale.LC_NUMERIC=,
locale.LC_TIME=, locale.LC_COLLATE=, locale.LC_MONETARY=,
locale.LC_MESSAGES=, locale.LC_PAPER=, locale.LC_NAME=,
locale.LC_ADDRESS=, locale.LC_TELEPHONE=, locale.LC_MEASUREMENT=,
locale.LC_IDENTIFICATION=
Parameters understood by the system and service manager to
control locale and language settings. For details, see
systemd(1).
fsck.mode=, fsck.repair=
Parameters understood by the file system checker services. For
details, see systemd-fsck@.service(8).
quotacheck.mode=
Parameter understood by the file quota checker service. For
details, see systemd-quotacheck.service(8).
systemd.journald.forward_to_syslog=,
systemd.journald.forward_to_kmsg=,
systemd.journald.forward_to_console=,
systemd.journald.forward_to_wall=
Parameters understood by the journal service. For details, see
systemd-journald.service(8).
vconsole.keymap=, vconsole.keymap_toggle=, vconsole.font=,
vconsole.font_map=, vconsole.font_unimap=
Parameters understood by the virtual console setup logic. For
details, see vconsole.conf(5).
udev.log_priority=, rd.udev.log_priority=, udev.children_max=,
rd.udev.children_max=, udev.exec_delay=, rd.udev.exec_delay=,
udev.event_timeout=, rd.udev.event_timeout=, net.ifnames=
Parameters understood by the device event managing daemon. For
details, see systemd-udevd.service(8).
plymouth.enable=
May be used to disable the Plymouth boot splash. For details, see
plymouth(8).
luks=, rd.luks=, luks.crypttab=, rd.luks.crypttab=, luks.name=,
rd.luks.name=, luks.uuid=, rd.luks.uuid=, luks.options=,
rd.luks.options=, luks.key=, rd.luks.key=
Configures the LUKS full-disk encryption logic at boot. For
details, see systemd-cryptsetup-generator(8).
fstab=, rd.fstab=
Configures the /etc/fstab logic at boot. For details, see
systemd-fstab-generator(8).
root=, rootfstype=, rootflags=, ro, rw
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-writable initially. For details, see
systemd-fstab-generator(8).
roothash=, systemd.verity=, rd.systemd.verity=,
systemd.verity_root_data=, systemd.verity_root_hash=
Configures the integrity protection root hash for the root file
system, and other related parameters. For details, see
systemd-veritysetup-generator(8).
systemd.gpt_auto=, rd.systemd.gpt_auto=
Configures whether GPT based partition auto-discovery shall be
attempted. For details, see systemd-gpt-auto-generator(8).
systemd.default_timeout_start_sec=
Overwrites the default start job timeout DefaultTimeoutStartSec=
at boot. For details, see systemd-system.conf(5).
modules_load=, rd.modules_load=
Load a specific kernel module early at boot. For details, see
systemd-modules-load.service(8).
resume=
Enables resume from hibernation using the specified device. All
fstab(5)-like paths are supported. For details, see
systemd-hibernate-resume-generator(8).
systemd.firstboot=
Takes a boolean argument, defaults to on. If off,
systemd-firstboot.service(8) 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.
systemd(1), bootparam(7), dracut.cmdline(7),
systemd-debug-generator(8), systemd-fsck@.service(8),
systemd-quotacheck.service(8), systemd-journald.service(8),
systemd-vconsole-setup.service(8), systemd-udevd.service(8),
plymouth(8), systemd-cryptsetup-generator(8),
systemd-veritysetup-generator(8), systemd-fstab-generator(8),
systemd-gpt-auto-generator(8), systemd-volatile-root.service(8),
systemd-modules-load.service(8), systemd-backlight@.service(8),
systemd-rfkill.service(8), systemd-hibernate-resume-generator(8),
systemd-firstboot.service(8)
1. kernel-parameters.html
https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html
This page is part of the systemd (systemd system and service manager)
project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have a bug
report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩. This
page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2018-02-02. (At that
time, the date of the most recent commit that was found in the repos‐
itory was 2018-02-02.) If you discover any rendering problems in
this HTML version of the page, or you believe there is a better or
more up-to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not part
of the original manual page), send a mail to man-pages@man7.org
systemd 234 KERNEL-COMMAND-LINE(7)
Pages that refer to this page: systemd(1), systemd-nspawn(1), systemd.exec(5), systemd.directives(7), systemd.index(7), systemd-debug-generator(8), systemd-fstab-generator(8), systemd-hibernate-resume-generator(8), systemd-volatile-root.service(8)
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HTML rendering created 2018-02-02 by Michael Kerrisk, author of The Linux Programming Interface, maintainer of the Linux man-pages project. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH.
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