systemd-poweroff.service <root
SYSTEMD-HALT.SERVICE(8)                systemd-halt.service               SYSTEMD-HALT.SERVICE(8)

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

SYNOPSIS
       systemd-halt.service

       systemd-poweroff.service

       systemd-reboot.service

       systemd-kexec.service

       /lib/systemd/systemd-shutdown

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

       When these services are run, they ensure that PID 1 is replaced by the
       /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 halt/poweroff/reboot/kexec systemd-shutdown
       will run all executables in /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
       systemd(1), systemctl(1), systemd.special(7), reboot(2), systemd-suspend.service(8)

systemd 229                                                               SYSTEMD-HALT.SERVICE(8)

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