[systemd-devel] [EXT] Re: Run "ipmitool power cycle" after lib/systemd/system-shutdown scripts

[Etienne Champetier]

Le jeu. 10 févr. 2022 à 11:49, Ulrich Windl
<Ulrich.Windl at rz.uni-regensburg.de> a écrit :
>
> >>> Lennart Poettering <lennart at poettering.net> schrieb am 10.02.2022 um 11:31
> in
> Nachricht <YgTpdVFRgL+uQoY9 at gardel-login>:
> > On Mi, 09.02.22 22:05, Etienne Champetier (champetier.etienne at gmail.com)
> > wrote:
> >
> >> Hello systemd hackers,
> >>
> >> After flashing the firmware of some pcie card I need to power cycle
> >> the server to finish the flashing process.
> >> For now I have a simple script in lib/systemd/system-shutdown/ running
> >> "ipmitool power cycle" but I would like to make sure it runs after
> >> other scripts like fwupd.shutdown or mdadm.shutdown
> >>
> >> Is there any way to have systemd cleanly power cycle my server instead
> >> of rebooting it ?
> >
> > What does "power cycle" entail that "reboot" doesnt? i.e. why doesn't
> > "systemctl reboot" suffice?
>
> My guess is that some smart cards with their own firmware and CPu do not
> reboot unless they are power cycled, so maybe if the firmware upgrade on the
> card does not force it to reboot, it my need a power cycle.
>
> >
> > /usr/lib/systemd/system-shutdown/ drop-ins are executed before the OS
> > transitions back into the initrd — the initrd will then detach the
> > root fs (i.e. undo what it attached at boot) and actually reboot. This
> > means if your command turns off the power source you should stick it
> > in the initrd's shutdown logic, and not into
> > /usr/lib/systemd/system-shutdown/. If you are using RHEL this means
> > into dracut. But adding it there is something to better discuss with
> > the dracut community than here.
>
> My guess is that it would be handled best by some special GRUB boot menu entry
> (like "boot 'power cycle' once).

This is pretty clean but it means going through "BIOS" init twice
which can be pretty long on physical servers

Etienne

> Regards,
> Ulrich
>
> >
> > Lennart
> >
> > --
> > Lennart Poettering, Berlin