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dracut-shutdown.service(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)



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