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
/usr/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. Similar, 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
/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.
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¶
systemd(1),
systemctl(1),
systemd.special(7),
reboot(2),
systemd-suspend.service(8)