name service switch Post: 44537

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systemd-halt.service

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

       /lib/systemd/system-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 237														   SYSTEMD-HALT.SERVICE(8)