dracut-shutdown.service man page on Oracle

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DRACUT-SHUTDOWN.S(8)		    dracut		  DRACUT-SHUTDOWN.S(8)

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)

dracut				  09/12/2013		  DRACUT-SHUTDOWN.S(8)
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