bootctl

BOOTCTL(1)                           bootctl                          BOOTCTL(1)



NAME
       bootctl - Control the firmware and boot manager settings

SYNOPSIS
       bootctl [OPTIONS...] {COMMAND}

DESCRIPTION
       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
       status
           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 default.

       install
           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.

       update
           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.

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

       is-installed
           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.

       random-seed
           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.

       list
           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
       The following options are understood:

       --esp-path=
           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.

       --boot-path=
           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 exits.

       -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.

       --no-variables
           Do not touch the firmware's boot loader list stored in EFI variables.

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

       --no-pager
           Do not pipe output into a pager.

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

       --version
           Print a short version string and exit.

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

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

NOTES
        1. Random Seeds
           https://systemd.io/RANDOM_SEEDS

        2. Boot Loader Specification
           https://systemd.io/BOOT_LOADER_SPECIFICATION

        3. Boot Loader Interface
           https://systemd.io/BOOT_LOADER_INTERFACE



systemd 246                                                           BOOTCTL(1)