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


SYSTEMD-HALT.SERVICE(8)     systemd-halt.service     SYSTEMD-HALT.SERVICE(8)

NAME         top

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

SYNOPSIS         top







DESCRIPTION         top

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

       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

       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
       halt/poweroff/reboot/kexec systemd-shutdown will run all executables
       in /usr/lib/systemd/system-shutdown/ and pass one arguments to them:
       either "halt", "poweroff", "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-halt.service (and the related units) should never
       be executed directly. Instead, trigger system shutdown with a command
       such as "systemctl halt" or suchlike.

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 2020-08-13.  (At that
       time, the date of the most recent commit that was found in the repos‐
       itory was 2020-08-11.)  If you discover any rendering problems in
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       of the original manual page), send a mail to

systemd 246                                          SYSTEMD-HALT.SERVICE(8)

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