bootctl(1) — Linux manual page


BOOTCTL(1)                         bootctl                        BOOTCTL(1)

NAME         top

       bootctl - Control the firmware and boot manager settings

SYNOPSIS         top

       bootctl [OPTIONS...] {COMMAND}

DESCRIPTION         top

       bootctl can check the EFI boot loader status, list available boot
       loaders and boot loader entries, and install, update, or remove the
       systemd-boot(7) boot loader on the current system.

COMMANDS         top

           Shows brief information about the system firmware, the boot
           loader that was used to boot the system, the boot loaders
           currently available in the ESP, the boot loaders listed in the
           firmware's list of boot loaders and the current default boot
           loader entry. If no command is specified, this is the implied

           Installs systemd-boot into the EFI system partition. A copy of
           systemd-boot will be stored as the EFI default/fallback loader at
           ESP/EFI/BOOT/BOOT*.EFI. The boot loader is then added to the top
           of the firmware's boot loader list.

           Updates all installed versions of systemd-boot(7), if the
           available version is newer than the version installed in the EFI
           system partition. This also includes the EFI default/fallback
           loader at ESP/EFI/BOOT/BOOT*.EFI. The boot loader is then added
           to end of the firmware's boot loader list if missing.

           Removes all installed versions of systemd-boot from the EFI
           system partition and the firmware's boot loader list.

           Checks whether systemd-boot is installed in the ESP. Note that a
           single ESP might host multiple boot loaders; this hence checks
           whether systemd-boot is one (of possibly many) installed boot
           loaders — and neither whether it is the default nor whether it is
           registered in any EFI variables.

           Generates a random seed and stores it in the EFI System
           Partition, for use by the systemd-boot boot loader. Also,
           generates a random 'system token' and stores it persistently as
           an EFI variable, if one has not been set before. If the boot
           loader finds the random seed in the ESP and the system token in
           the EFI variable it will derive a random seed to pass to the OS
           and a new seed to store in the ESP from the combination of both.
           The random seed passed to the OS is credited to the kernel's
           entropy pool by the system manager during early boot, and permits
           userspace to boot up with an entropy pool fully initialized very
           early on. Also see systemd-boot-system-token.service(8).

           See Random Seeds[1] for further information.

       systemd-efi-options [STRING]
           When called without the optional argument, prints the current
           value of the "SystemdOptions" EFI variable. When called with an
           argument, sets the variable to that value. See systemd(1) for the
           meaning of that variable.

       reboot-to-firmware [BOOL]
           Query or set the "Reboot-Into-Firmware-Setup" flag of the EFI
           firmware. Takes a boolean argument which controls whether to show
           the firmware setup on next system reboot. If the argument is
           omitted shows the current status of the flag, or whether the flag
           is supported. This controls the same flag as systemctl reboot
           --firmware-setup, but is more low-level and allows setting the
           flag independently from actually requesting a reboot.

           Shows all available boot loader entries implementing the Boot
           Loader Specification[2], as well as any other entries discovered
           or automatically generated by the boot loader.

       set-default ID, set-oneshot ID
           Sets the default boot loader entry. Takes a single boot loader
           entry ID string as argument. The set-oneshot command will set the
           default entry only for the next boot, the set-default will set it
           persistently for all future boots.

OPTIONS         top

       The following options are understood:

           Path to the EFI System Partition (ESP). If not specified, /efi/,
           /boot/, and /boot/efi/ are checked in turn. It is recommended to
           mount the ESP to /efi/, if possible.

           Path to the Extended Boot Loader partition, as defined in the
           Boot Loader Specification[2]. If not specified, /boot/ is
           checked. It is recommended to mount the Extended Boot Loader
           partition to /boot/, if possible.

       -p, --print-esp-path
           This option modifies the behaviour of status. Only prints the
           path to the EFI System Partition (ESP) to standard output and

       -x, --print-boot-path
           This option modifies the behaviour of status. Only prints the
           path to the Extended Boot Loader partition if it exists, and the
           path to the ESP otherwise to standard output and exit. This
           command is useful to determine where to place boot loader
           entries, as they are preferably placed in the Extended Boot
           Loader partition if it exists and in the ESP otherwise.

           Boot Loader Specification Type #1 entries should generally be
           placed in the directory "$(bootctl -x)/loader/entries/".
           Existence of that directory may also be used as indication that
           boot loader entry support is available on the system. Similarly,
           Boot Loader Specification Type #2 entries should be placed in the
           directory "$(bootctl -x)/EFI/Linux/".

           Note that this option (similar to the --print-booth-path option
           mentioned above), is available independently from the boot loader
           used, i.e. also without systemd-boot being installed.

           Do not touch the firmware's boot loader list stored in EFI

           Ignore failure when the EFI System Partition cannot be found, or
           when EFI variables cannot be written. Currently only applies to
           random seed operations.

           Do not pipe output into a pager.

       -h, --help
           Print a short help text and exit.

           Print a short version string and exit.

EXIT STATUS         top

       On success, 0 is returned, a non-zero failure code otherwise.

ENVIRONMENT         top

       If $SYSTEMD_RELAX_ESP_CHECKS=1 is set the validation checks for the
       ESP are relaxed, and the path specified with --esp-path= may refer to
       any kind of file system on any kind of partition.

       Similarly, $SYSTEMD_RELAX_XBOOTLDR_CHECKS=1 turns off some validation
       checks for the Extended Boot Loader partition.

SEE ALSO         top

       systemd-boot(7), Boot Loader Specification[2], Boot Loader
       Interface[3], systemd-boot-system-token.service(8)

NOTES         top

        1. Random Seeds

        2. Boot Loader Specification

        3. Boot Loader Interface

COLOPHON         top

       This page is part of the systemd (systemd system and service manager)
       project.  Information about the project can be found at 
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       report for this manual page, see
       ⟨⟩.  This
       page was obtained from the project's upstream Git repository
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       time, the date of the most recent commit that was found in the repos‐
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systemd 245                                                       BOOTCTL(1)

Pages that refer to this page: loader.conf(5)30-systemd-environment-d-generator(7)kernel-command-line(7)sd-boot(7)systemd-boot(7)systemd.directives(7)systemd.index(7)systemd-boot-system-token.service(8)