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KERNEL-COMMAND-LINE(7) kernel-command-line KERNEL-COMMAND-LINE(7)
NAME
kernel-command-line - Kernel command line parameters
SYNOPSIS
/proc/cmdline
DESCRIPTION
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.txt[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.
CORE OS COMMAND LINE ARGUMENTS
systemd.unit=, rd.systemd.unit=, systemd.dump_core=, systemd.crash_shell=,
systemd.crash_chvt=, systemd.confirm_spawn=, systemd.show_status=, systemd.log_target=,
systemd.log_level=, systemd.log_color=, systemd.log_location=,
systemd.default_standard_output=, systemd.default_standard_error=, systemd.setenv=
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).
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, emergency, rescue, single, s, S, 1, 2, 3, 4, 5
Parameters understood by the system and service manager, as compatibility 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 systemd-
vconsole-setup.service(8).
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).
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).
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).
SEE ALSO
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-fstab-generator(8), systemd-gpt-auto-generator(8), systemd-modules-
load.service(8), systemd-backlight@.service(8), systemd-rfkill@.service(8), systemd-
hibernate-resume-generator(8)
NOTES
1. kernel-parameters.txt
https://www.kernel.org/doc/Documentation/kernel-parameters.txt
systemd 219 KERNEL-COMMAND-LINE(7)
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