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dracut-shutdown.service(8) [centos man page]

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)

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DRACUT.BOOTUP(7)						      dracut							  DRACUT.BOOTUP(7)

NAME
dracut.bootup - boot ordering in the initramfs DESCRIPTION
This flow chart illustrates the ordering of the services, if systemd is used in the dracut initramfs. systemd-journal.socket | v dracut-cmdline.service | v dracut-pre-udev.service | v systemd-udevd.service | v local-fs-pre.target dracut-pre-trigger.service | | v v (various mounts) (various swap systemd-udev-trigger.service | devices...) | (various low-level (various low-level | | | services: seed, API VFS mounts: v v v tmpfiles, random mqueue, configfs, local-fs.target swap.target dracut-initqueue.service sysctl, ...) debugfs, ...) | | | | | \_______________|____________________ | ___________________|____________________/ |/ v sysinit.target | _________________/|\___________________ / | | | | v | v (various | rescue.service sockets...) | | | | v v | rescue.target sockets.target | | | \_________________ | emergency.service | | v v basic.target emergency.target | ______________________/| / | | v | dracut-pre-mount.service | | | v | sysroot.mount | | | v | initrd-root-fs.target (custom initrd services) | | v | dracut-mount.service | | | v | initrd-parse-etc.service | | | v | (sysroot-usr.mount and | various mounts marked | with fstab option | x-initrd.mount) | | | v | initrd-fs.target \______________________ | | v initrd.target | v dracut-pre-pivot.service | v initrd-cleanup.service isolates to initrd-switch-root.target | v ______________________/| / | | initrd-udevadm-cleanup-db.service | | (custom initrd services) | | | \______________________ | | v initrd-switch-root.target | v initrd-switch-root.service | v switch-root AUTHOR
Harald Hoyer SEE ALSO
dracut(8) bootup(7) dracut 06/12/2014 DRACUT.BOOTUP(7)
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