Provided by: systemd-boot_255.4-1ubuntu8.5_amd64 
NAME
bootctl - Control EFI firmware boot settings and manage boot loader
SYNOPSIS
bootctl [OPTIONS...] {COMMAND}
DESCRIPTION
bootctl can check the EFI firmware and boot loader status, list and manage available boot loaders and
boot loader entries, and install, update, or remove the systemd-boot(7) boot loader on the current
system.
GENERIC EFI FIRMWARE/BOOT LOADER COMMANDS
These commands are available on any EFI system, regardless of the boot loader used.
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.
See the example below for details of the output.
Added in version 239.
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.
Hint: use systemctl reboot --firmware-setup to reboot into firmware setup once. See systemctl(1) for
details.
Added in version 251.
BOOT LOADER SPECIFICATION COMMANDS
These commands are available for all boot loaders that implement the Boot Loader Specification[1], such
as systemd-boot.
list
Shows all available boot loader entries implementing the Boot Loader Specification[1], as well as any
other entries discovered or automatically generated by a boot loader implementing the Boot Loader
Interface[2]. JSON output may be requested with --json=.
See the example below for details of the output.
Added in version 239.
unlink ID
Removes a boot loader entry including the files it refers to. Takes a single boot loader entry ID
string or a glob pattern as argument. Referenced files such as kernel or initrd are only removed if
no other entry refers to them.
Added in version 253.
cleanup
Removes files from the ESP and XBOOTLDR partitions that belong to the entry token but are not
referenced in any boot loader entries.
Added in version 253.
BOOT LOADER INTERFACE COMMANDS
These commands are available for all boot loaders that implement the Boot Loader Specification[1] and the
Boot Loader Interface[2], such as systemd-boot.
set-default ID, set-oneshot ID
Sets the default boot loader entry. Takes a single boot loader entry ID string or a glob pattern 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.
bootctl list can be used to list available boot loader entries and their IDs.
In addition, the boot loader entry ID may be specified as one of: @default, @oneshot or @current,
which correspond to the current default boot loader entry for all future boots, the current default
boot loader entry for the next boot, and the currently booted boot loader entry. These special IDs
are resolved to the current values of the EFI variables LoaderEntryDefault, LoaderEntryOneShot and
LoaderEntrySelected, see Boot Loader Specification[1] for details. These special IDs are primarily
useful as a quick way to persistently make the currently booted boot loader entry the default choice,
or to upgrade the default boot loader entry for the next boot to the default boot loader entry for
all future boots, but may be used for other operations too.
If set to @saved the chosen entry will be saved as an EFI variable on every boot and automatically
selected the next time the boot loader starts.
When an empty string ("") is specified as the ID, then the corresponding EFI variable will be unset.
Hint: use systemctl reboot --boot-loader-entry=ID to reboot into a specific boot entry and systemctl
reboot --boot-loader-menu=timeout to reboot into the boot loader menu once. See systemctl(1) for
details.
Added in version 240.
set-timeout TIMEOUT, set-timeout-oneshot TIMEOUT
Sets the boot loader menu timeout in seconds. The set-timeout-oneshot command will set the timeout
only for the next boot. See systemd.time(7) for details about the syntax of time spans.
If this is set to menu-disabled or menu-hidden or 0, no menu is shown and the default entry will be
booted immediately, while setting this to menu-force disables the timeout while always showing the
menu. When an empty string ("") is specified the bootloader will revert to its default menu timeout.
Added in version 250.
SYSTEMD-BOOT COMMANDS
These commands manage the systemd-boot EFI boot loader, and do not work in conjunction with other boot
loaders.
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.
Added in version 239.
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.
Added in version 239.
remove
Removes all installed versions of systemd-boot from the EFI system partition and the firmware's boot
loader list.
Added in version 239.
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.
Added in version 243.
random-seed
Generates a random seed and stores it in the EFI System Partition (ESP), for use by the systemd-boot
boot loader. If a random seed already exists in the ESP it is refreshed. 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-random-seed.service(8).
See Random Seeds[3] for further information.
Added in version 243.
KERNEL IMAGE COMMANDS
kernel-identify kernel
Takes a kernel image as argument. Checks what kind of kernel the image is. Returns one of "uki",
"pe", and "unknown".
Added in version 253.
kernel-inspect kernel
Takes a kernel image as argument. Prints details about the image.
Added in version 253.
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[1]. If not
specified, /boot/ is checked. It is recommended to mount the Extended Boot Loader partition to
/boot/, if possible.
--root=root
Takes a directory path as an argument. All paths will be prefixed with the given alternate root path,
including config search paths.
Added in version 252.
--image=image
Takes a path to a disk image file or block device node. If specified, all operations are applied to
file system in the indicated disk image. This option is similar to --root=, but operates on file
systems stored in disk images or block devices. The disk image should either contain just a file
system or a set of file systems within a GPT partition table, following the Discoverable Partitions
Specification[4]. For further information on supported disk images, see systemd-nspawn(1)'s switch of
the same name.
Added in version 252.
--image-policy=policy
Takes an image policy string as argument, as per systemd.image-policy(7). The policy is enforced when
operating on the disk image specified via --image=, see above. If not specified defaults to the "*"
policy, i.e. all recognized file systems in the image are used.
--install-source=
When installing binaries with --root= or --image=, selects where to source them from. Takes one of
"auto" (the default), "image" or "host". With "auto" binaries will be picked from the specified
directory or image, and if not found they will be picked from the host. With "image" or "host" no
fallback search will be performed if the binaries are not found in the selected source.
Added in version 252.
-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.
Added in version 236.
-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 (similarly to the --print-boot-path option mentioned above), is available
independently from the boot loader used, i.e. also without systemd-boot being installed.
Added in version 242.
-R, --print-root-device
Print the path to the block device node backing the root file system of the local OS. This prints a
path such as /dev/nvme0n1p5. If the root file system is backed by dm-crypt/LUKS or dm-verity the
underlying block device is returned. If the root file system is backed by multiple block devices (as
supported by btrfs) the operation will fail. If the switch is specified twice (i.e. -RR) and the
discovered block device is a partition device the "whole" block device it belongs to is determined
and printed (e.g. /dev/nvme0n1). If the root file system is "tmpfs" (or a similar in-memory file
system), the block device backing /usr/ is returned if applicable. If the root file system is a
network file system (e.g. NFS, CIFS) the operation will fail.
Added in version 254.
--no-variables
Do not touch the firmware's boot loader list stored in EFI variables.
Added in version 220.
--graceful
Ignore failure when the EFI System Partition cannot be found, when EFI variables cannot be written,
or a different or newer boot loader is already installed. Currently only applies to is-installed,
update, and random-seed verbs.
Added in version 244.
-q, --quiet
Suppress printing of the results of various commands and also the hints about ESP being unavailable.
Added in version 251.
--make-entry-directory=yes|no
Controls creation and deletion of the Boot Loader Specification[1] Type #1 entry directory on the
file system containing resources such as kernel and initrd images during install and remove,
respectively. The directory is named after the entry token, as specified with --entry-token=
parameter described below, and is placed immediately below the $BOOT root directory (i.e. beneath the
file system returned by the --print-boot-path option, see above). Defaults to "no".
Added in version 251.
--entry-token=
Controls how to name and identify boot loader entries for this OS installation. Accepted during
install, and takes one of "auto", "machine-id", "os-id", "os-image-id" or an arbitrary string
prefixed by "literal:" as argument.
If set to machine-id the entries are named after the machine ID of the running system (e.g.
"b0e793a9baf14b5fa13ecbe84ff637ac"). See machine-id(5) for details about the machine ID concept and
file.
If set to os-id the entries are named after the OS ID of the running system, i.e. the ID= field of
os-release(5) (e.g. "fedora"). Similarly, if set to os-image-id the entries are named after the OS
image ID of the running system, i.e. the IMAGE_ID= field of os-release (e.g.
"vendorx-cashier-system").
If set to auto (the default), the /etc/kernel/entry-token file will be read if it exists, and the
stored value used. Otherwise if the local machine ID is initialized it is used. Otherwise IMAGE_ID=
from os-release will be used, if set. Otherwise, ID= from os-release will be used, if set.
Unless set to "machine-id", or when --make-entry-directory=yes is used the selected token string is
written to a file /etc/kernel/entry-token, to ensure it will be used for future entries. This file is
also read by kernel-install(8), in order to identify under which name to generate boot loader entries
for newly installed kernels, or to determine the entry names for removing old ones.
Using the machine ID for naming the entries is generally preferable, however there are cases where
using the other identifiers is a good option. Specifically: if the identification data that the
machine ID entails shall not be stored on the (unencrypted) $BOOT partition, or if the ID shall be
generated on first boot and is not known when the entries are prepared. Note that using the machine
ID has the benefit that multiple parallel installations of the same OS can coexist on the same
medium, and they can update their boot loader entries independently. When using another identifier
(such as the OS ID or the OS image ID), parallel installations of the same OS would try to use the
same entry name. To support parallel installations, the installer must use a different entry token
when adding a second installation.
Added in version 251.
--all-architectures
Install binaries for all supported EFI architectures (this implies --no-variables).
Added in version 252.
--efi-boot-option-description=
Description of the entry added to the firmware's boot option list. Defaults to "Linux Boot Manager".
Using the default entry name "Linux Boot Manager" is generally preferable as only one bootloader
installed to a single ESP partition should be used to boot any number of OS installations found on
the various disks installed in the system. Specifically distributions should not use this flag to
install a branded entry in the boot option list. However in situations with multiple disks, each with
their own ESP partition, it can be beneficial to make it easier to identify the bootloader being used
in the firmware's boot option menu.
Added in version 252.
--dry-run
Dry run for unlink and cleanup.
In dry run mode, the unlink and cleanup operations only print the files that would get deleted
without actually deleting them.
Added in version 253.
--no-pager
Do not pipe output into a pager.
--json=MODE
Shows output formatted as JSON. Expects one of "short" (for the shortest possible output without any
redundant whitespace or line breaks), "pretty" (for a pretty version of the same, with indentation
and line breaks) or "off" (to turn off JSON output, the default).
-h, --help
Print a short help text and exit.
--version
Print a short version string and exit.
SIGNED .EFI FILES
bootctl install and update will look for a systemd-boot file ending with the ".efi.signed" suffix first,
and copy that instead of the normal ".efi" file. This allows distributions or end-users to provide signed
images for UEFI SecureBoot.
EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise. bootctl --print-root-device returns exit
status 80 in case the root file system is not backed by single block device, and other non-zero exit
statuses on other errors.
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.
EXAMPLES
Example 1. Output from status and list
$ bootctl status
System:
Firmware: UEFI 2.40 (firmware-version) ← firmware vendor and version
Secure Boot: disabled (setup) ← Secure Boot status
TPM2 Support: yes
Boot into FW: supported ← does the firmware support booting into itself
Current Boot Loader: ← details about sd-boot or another boot loader
Product: systemd-boot version implementing the Boot Loader Interface[2]
Features: ✓ Boot counting
✓ Menu timeout control
✓ One-shot menu timeout control
✓ Default entry control
✓ One-shot entry control
✓ Support for XBOOTLDR partition
✓ Support for passing random seed to OS
✓ Load drop-in drivers
✓ Boot loader sets ESP information
✓ Menu can be disabled
ESP: /dev/disk/by-partuuid/01234567-89ab-cdef-dead-beef00000000
File: └─/EFI/systemd/systemd-bootx64.efi
Random Seed: ← random seed used for entropy in early boot
Passed to OS: yes
System Token: set
Exists: yes
Available Boot Loaders on ESP:
ESP: /boot/efi (/dev/disk/by-partuuid/01234567-89ab-cdef-dead-beef00000000)
File: └─/EFI/systemd/systemd-bootx64.efi (systemd-boot 251
File: └─/EFI/BOOT/BOOTX64.EFI (systemd-boot 251
Boot Loaders Listed in EFI Variables:
Title: Linux Boot Manager
ID: 0x0001
Status: active, boot-order
Partition: /dev/disk/by-partuuid/...
File: └─/EFI/systemd/systemd-bootx64.efi
Title: Fedora
ID: 0x0000
Status: active, boot-order
Partition: /dev/disk/by-partuuid/...
File: └─/EFI/fedora/shimx64.efi
Title: Linux-Firmware-Updater
ID: 0x0002
Status: active, boot-order
Partition: /dev/disk/by-partuuid/...
File: └─/EFI/fedora/fwupdx64.efi
Boot Loader Entries:
$BOOT: /boot/efi (/dev/disk/by-partuuid/01234567-89ab-cdef-dead-beef00000000)
Default Boot Loader Entry:
type: Boot Loader Specification Type #1 (.conf)
title: Fedora Linux 36 (Workstation Edition)
id: ...
source: /boot/efi/loader/entries/entry-token-kernel-version.conf
version: kernel-version
machine-id: ...
linux: /entry-token/kernel-version/linux
initrd: /entry-token/kernel-version/initrd
options: root=...
$ bootctl list
Boot Loader Entries:
type: Boot Loader Specification Type #1 (.conf)
title: Fedora Linux 36 (Workstation Edition) (default) (selected)
id: ...
source: /boot/efi/loader/entries/entry-token-kernel-version.conf
version: kernel-version
machine-id: ...
linux: /entry-token/kernel-version/linux
initrd: /entry-token/kernel-version/initrd
options: root=...
type: Boot Loader Specification Type #2 (.efi)
title: Fedora Linux 35 (Workstation Edition)
id: ...
source: /boot/efi/EFI/Linux/fedora-kernel-version.efi
version: kernel-version
machine-id: ...
linux: /EFI/Linux/fedora-kernel-version.efi
options: root=...
type: Automatic
title: Reboot Into Firmware Interface
id: auto-reboot-to-firmware-setup
source: /sys/firmware/efi/efivars/LoaderEntries-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f
In the listing, "(default)" specifies the entry that will be used by default, and "(selected)" specifies
the entry that was selected the last time (i.e. is currently running).
SEE ALSO
systemd-boot(7), Boot Loader Specification[1], Boot Loader Interface[2], systemd-boot-random-
seed.service(8)
NOTES
1. Boot Loader Specification
https://uapi-group.org/specifications/specs/boot_loader_specification
2. Boot Loader Interface
https://systemd.io/BOOT_LOADER_INTERFACE
3. Random Seeds
https://systemd.io/RANDOM_SEEDS
4. Discoverable Partitions Specification
https://uapi-group.org/specifications/specs/discoverable_partitions_specification