/usr/lib/dracut/modules.d/98systemd/dracut-shutdown.service.8.asc is in dracut 040+1-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | DRACUT-SHUTDOWN.SERVICE(8)
===========================
:doctype: manpage
:man source: dracut
:man manual: dracut
NAME
----
dracut-shutdown.service - unpack the initramfs to /run/initramfs
SYNOPSIS
--------
dracut-shutdown.service
DESCRIPTION
-----------
This service unpacks the initramfs image to /run/initramfs.
systemd pivots into /run/initramfs at shutdown, so the root filesytem
can be safely unmounted.
The following steps are executed during a shutdown:
* systemd switches to the shutdown.target
* systemd starts /lib/systemd/system/shutdown.target.wants/dracut-shutdown.service
* dracut-shutdown.service executes /usr/lib/dracut/dracut-initramfs-restore which unpacks the initramfs to /run/initramfs
* systemd finishes shutdown.target
* systemd kills all processes
* systemd tries to unmount everything and mounts the remaining read-only
* systemd checks, if there is a /run/initramfs/shutdown executable
* if yes, it does a pivot_root to /run/initramfs and executes ./shutdown. The old root is then mounted on /oldroot. /usr/lib/dracut/modules.d/99shutdown/shutdown.sh is the shutdown executable.
* shutdown will try to umount every /oldroot mount and calls the various shutdown hooks from the dracut modules
This ensures, that all devices are disassembled and unmounted cleanly.
To debug the shutdown process, you can get a shell in the shutdown procedure
by injecting "rd.break=pre-shutdown rd.shell" or "rd.break=shutdown rd.shell".
----
# mkdir -p /run/initramfs/etc/cmdline.d
# echo "rd.break=pre-shutdown rd.shell" > /run/initramfs/etc/cmdline.d/debug.conf
# touch /run/initramfs/.need_shutdown
----
AUTHORS
-------
Harald Hoyer
SEE ALSO
--------
*dracut*(8)
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