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)

DRACUT.CONF(5)							      dracut							    DRACUT.CONF(5)

NAME

       dracut.conf - configuration file(s) for dracut

SYNOPSIS

       /etc/dracut.conf /etc/dracut.conf.d/*.conf

DESCRIPTION

       dracut.conf is loaded during the initialisation phase of dracut. Command line parameter will overwrite any values set here.
       dracut.conf.d/*.conf files are read in alphanumerical order and will overwrite parameters set in /etc/dracut.conf. Each line specifies an
       attribute and a value. A # indicates the beginning of a comment; following characters, up to the end of the line are not interpreted.

       dracutmodules+=" <dracut modules> "
	   Specify a space-separated list of dracut modules to call when building the initramfs. Modules are located in /usr/lib/dracut/modules.d.

       omit_dracutmodules+=" <dracut modules> "
	   Omit a space-separated list of dracut modules.

       add_dracutmodules+=" <dracut modules> "
	   Add a space-separated list of dracut modules.

       drivers+=" <kernel modules> "
	   Specify a space-separated list of kernel modules to exclusively include in the initramfs. The kernel modules have to be specified
	   without the ".ko" suffix.

       add_drivers+=" <kernel modules> "
	   Specify a space-separated list of kernel modules to add to the initramfs. The kernel modules have to be specified without the ".ko"
	   suffix.

       omit_drivers+=" <kernel modules> "
	   Specify a space-separated list of kernel modules not to add to the initramfs. The kernel modules have to be specified without the ".ko"
	   suffix.

       install_items+=" <kernel modules> "
	   Specify a space-separated list of files, which are added to the initramfs image.

       filesystems+=" <filesystem names> "
	   Specify a space-separated list of kernel filesystem modules to exclusively include in the generic initramfs.

       drivers_dir="<kernel modules directory>"
	   Specify the directory, where to look for kernel modules

       fw_dir+=" :<dir>[:<dir> ...] "
	   Specify additional directories, where to look for firmwares, separated by :

       install_items+=" <file>[ <file> ...] "
	   Specify additional files to include in the initramfs, separated by spaces.

       do_strip="{yes|no}"
	   Strip binaries in the initramfs (default=yes)

       hostonly="{yes|no}"
	   Host-Only mode: Install only what is needed for booting the local host instead of a generic host and generate host-specific
	   configuration.

       tmpdir="<temporary directory>"
	   Specify temporary directory to use.

	   Warning
	   If chrooted to another root other than the real root device, use --fstab and provide a valid /etc/fstab.

       use_fstab="{yes|no}"
	   Use /etc/fstab instead of /proc/self/mountinfo.

       add_fstab+=" <filename> "
	   Add entries of <filename> to the initramfs /etc/fstab.

       mdadmconf="{yes|no}"
	   Include local /etc/mdadm.conf (default=yes)

       lvmconf="{yes|no}"
	   Include local /etc/lvm/lvm.conf (default=yes)

       fscks=" <fsck tools> "
	   Add a space-separated list of fsck tools. If nothing is specified, the default is: "umount mount /sbin/fsck* xfs_db xfs_check
	   xfs_repair e2fsck jfs_fsck reiserfsck btrfsck". The installation is opportunistic (non-existing tools are ignored).

       nofscks="{yes|no}"
	   If specified, inhibit installation of any fsck tools.

       kernel_only="{yes|no}"
	   Only install kernel drivers and firmware files. (default=no)

       no_kernel="{yes|no}"
	   Do not install kernel drivers and firmware files (default=no)

       stdloglvl="{0-6}"
	   Set logging to standard error level.

       sysloglvl="{0-6}"
	   Set logging to syslog level.

       fileloglvl="{0-6}"
	   Set logging to file level.

       logfile="<file>"
	   Path to log file.

       show_modules="{yes|no}"
	   Print included module's name to standard output during build.

FILES

       /etc/dracut.conf
	   Old configuration file. You better use your own file in /etc/dracut/conf.d/.

       /etc/dracut/conf.d/
	   Any /etc/dracut/conf.d/*.conf file can overwrite the values in /etc/dracut.conf. The configuration files are read in alphanumerical
	   order.

AUTHOR

       Harald Hoyer

SEE ALSO

       dracut(8) dracut.cmdline(7)

dracut								    11/08/2012							    DRACUT.CONF(5)