[systemd-devel] What is the shutdown sequence with systemd and dracut?

[Patrick Schleizer]

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