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List:       systemd-devel
Subject:    [systemd-devel] What is the shutdown sequence with systemd and dracut?
From:       Patrick Schleizer <patrick-mailinglists () whonix ! org>
Date:       2022-08-08 12:24:27
Message-ID: 7abb7852-c097-34d6-c4ea-f2101fc5d327 () whonix ! org
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Hi!

This is what I think but please correct me if I am wrong.

1. systemd runs systemd units for systemd shutdown.target

2. /lib/systemd/system-shutdown (shutdown.c) runs

3. /lib/systemd/system-shutdown executes /run/initramfs/shutdown (which
is dracut)

4. dracut shutdown.sh performs various cleanup tasks (such as kill all
remaining processes and unmount root disk)

5. /lib/systemd/system-shutdown runs scripts in the
/usr/lib/systemd/system-shutdown/ folder

6. /lib/systemd/system-shutdown performs further cleanup (similar to
dracut, probably some functionality duplicated with dracut, includes
kill all remaining processes, unmount the root risk) and eventually
halt/reboot/poweroff/kexec.

Cheers,
Patrick
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