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_chvt=, systemd.crash_shell=, systemd.crash_reboot=,
   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=, systemd.machine_id=
       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, 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).

   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).

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

---

Free and Open Source Software