Profiling Processes while shutdown Post: 302982180

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Operating Systems Linux Debian Profiling Processes while shutdown Post 302982180 by rbatte1 on Monday 26th of September 2016 05:38:33 AM

09-26-2016

Moderator

There isn't a lot of detail in the thread, but things to consider might be:-

If you have a database, is it possible that there is a major transaction rollback being done?
Do any of you shutdown scripts have waits in them?
NFS (as already mentioned)
Is there some sort of notification you are trying to do and the target server is down? Perhaps a closing down report to ensure all transactions are centrally held etc.
Has someone introduced a backup into the wrong place, so it runs at shutdown?
Has someone created a shutdown script that actually does a startup by mistake? (i.e. never it checks $1 for start or stop, it just starts)
Is there an AV scan being triggered in the shutdown?
Do you run an fsck during shutdown?
Do you try to sync the clock during shutdown?
Is this a High Availability node, or worse an HA node where the other node(s) are all off?

There are lots of other possibles too, I'm sure. What more can you tell us about it?

Kind regards,
Robin

rbatte1

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LEARN ABOUT CENTOS

dracut-shutdown.service

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:

       o   systemd switches to the shutdown.target

       o   systemd starts /lib/systemd/system/shutdown.target.wants/dracut-shutdown.service

       o   dracut-shutdown.service executes /usr/lib/dracut/dracut-initramfs-restore which unpacks the initramfs to /run/initramfs

       o   systemd finishes shutdown.target

       o   systemd kills all processes

       o   systemd tries to unmount everything and mounts the remaining read-only

       o   systemd checks, if there is a /run/initramfs/shutdown executable

       o   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.

       o   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)