systemd-poweroff.service(8) — Linux manual page



NAME         top

       systemd-poweroff.service, systemd-halt.service, systemd-
       reboot.service, systemd-kexec.service, systemd-shutdown - System
       shutdown logic

SYNOPSIS         top







DESCRIPTION         top

       systemd-poweroff.service is a system service that is pulled in by and is responsible for the actual system
       power-off operation. Similarly, systemd-halt.service is pulled in
       by, systemd-reboot.service by and
       systemd-kexec.service by to execute the respective

       When these services are run, they ensure that PID 1 is replaced
       by the /usr/lib/systemd/systemd-shutdown tool which is then
       responsible for the actual shutdown. Before shutting down, this
       binary will try to unmount all remaining file systems, disable
       all remaining swap devices, detach all remaining storage devices
       and kill all remaining processes.

       It is necessary to have this code in a separate binary because
       otherwise rebooting after an upgrade might be broken — the
       running PID 1 could still depend on libraries which are not
       available any more, thus keeping the file system busy, which then
       cannot be re-mounted read-only.

       Immediately before executing the actual system
       power-off/halt/reboot/kexec systemd-shutdown will run all
       executables in /usr/lib/systemd/system-shutdown/ and pass one
       arguments to them: either "poweroff", "halt", "reboot", or
       "kexec", depending on the chosen action. All executables in this
       directory are executed in parallel, and execution of the action
       is not continued before all executables finished.

       Note that systemd-poweroff.service (and the related units) should
       never be executed directly. Instead, trigger system shutdown with
       a command such as "systemctl poweroff".

SEE ALSO         top

       systemd(1), systemctl(1), systemd.special(7), reboot(2),
       systemd-suspend.service(8), bootup(7)

COLOPHON         top

       This page is part of the systemd (systemd system and service
       manager) project.  Information about the project can be found at
       ⟨⟩.  If you have
       a bug report for this manual page, see
       This page was obtained from the project's upstream Git repository
       ⟨⟩ on 2022-12-17.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2022-12-16.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
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       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

systemd 252                                  SYSTEMD-POWEROFF.SERVICE(8)

Pages that refer to this page: bootup(7)systemd.directives(7)systemd.index(7)systemd-suspend.service(8)