dracut Project Leader, Developer Harald Hoyer harald@redhat.com Developer Victor Lowther victor.lowther@gmail.com Developer Warren Togami wtogami@redhat.com Developer Jeremy Katz katzj@redhat.com Developer Philippe Seewer philippe.seewer@bfh.ch Developer David Dillow dave@thedillows.org Developer Amadeusz Żołnowski aidecoe@aidecoe.name dracut 8 dracut create initial ramdisk images for preloading modules dracut OPTION <image> <kernel-version> dracut creates an initial image used by the kernel for preloading the block device modules (such as IDE, SCSI or RAID) which are needed to access the root filesystem. For a complete list of kernel command line options see dracut.kernel 7 -f --force overwrite existing initramfs file. -m --modules <list of dracut modules> specify a space-separated list of dracut modules to call when building the initramfs. Modules are located in /usr/share/dracut/modules.d. This parameter can be specified multiple times. -o --omit <list of dracut modules> omit a space-separated list of dracut modules. This parameter can be specified multiple times. -a --add <list of dracut modules> add a space-separated list of dracut modules to the default set of modules. This parameter can be specified multiple times. -d --drivers <list of 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. This parameter can be specified multiple times. --add-drivers <list of 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. This parameter can be specified multiple times. --filesystems <list of filesystems> specify a space-separated list of kernel filesystem modules to exclusively include in the generic initramfs. This parameter can be specified multiple times. -k --kmoddir <kernel directory> specify the directory, where to look for kernel modules --fwdir <dir>[:<dir>...] specify additional directories, where to look for firmwares. This parameter can be specified multiple times. --kernel-only only install kernel drivers and firmware files --no-kernel do not install kernel drivers and firmware files --mdadmconf include local /etc/mdadm.conf --nomdadmconf do not include local /etc/mdadm.conf --strip strip binaries in the initramfs (default) --nostrip do not strip binaries in the initramfs --prefix prefix initramfs files with /run/initramfs/ --noprefix do not prefix initramfs files with /run/initramfs/ (default) -h --help display help text and exit. --debug output debug information of the build process -v --verbose increase verbosity level (default is info(4)) -q --quiet decrease verbosity level (default is info(4)) -c --conf <dracut configuration file> specify configuration file to use. Default: /etc/dracut.conf --confdir <configuration directory> specify configuration directory to use. Default: /etc/dracut.conf.d -l --local activates the local mode. dracut will use modules from the current working directory instead of the system-wide installed modules in /usr/share/dracut/modules.d. This is useful when running dracut from a git checkout. -H --hostonly Host-Only mode: Install only what is needed for booting the local host instead of a generic host. If chrooted to another root other than the real root device, use "--fstab" and provide a valid /etc/fstab. --fstab Use /etc/fstab instead of /proc/self/mountinfo. -i --include <SOURCE> <TARGET> include the files in the SOURCE directory into the TARGET directory in the final initramfs. If SOURCE is a file, it will be installed to TARGET in the final initramfs. This parameter can be specified multiple times. -I --install <file list> install the space separated list of files into the initramfs. --gzip Compress the generated initramfs using gzip. This will be done by default, unless another compression option or --no-compress is passed. Equivalent to "--compress=gzip -9" --bzip2 Compress the generated initramfs using bzip2. Make sure your kernel has bzip2 decompression support compiled in, otherwise you will not be able to boot. Equivalent to "--compress=bzip2" --lzma Compress the generated initramfs using lzma. Make sure your kernel has lzma decompression support compiled in, otherwise you will not be able to boot. Equivalent to "--compress=lzma -9" --xz Compress the generated initramfs using xz. Make sure your kernel has xz decompression support compiled in, otherwise you will not be able to boot. Equivalent to "--compress=xz --check=crc32 --lzma2=dict=1MiB" --compress <compressor> Compress the generated initramfs using the passed compression program. If you pass it just the name of a compression program, it will call that program with known-working arguments. If you pass a quoted string with arguments, it will be called with exactly those arguments. Depending on what you pass, this may result in an initramfs that the kernel cannot decompress. --no-compress Do not compress the generated initramfs. This will override any other compression options. --list-modules List all available dracut modules. -M --show-modules Print included module's name to standard output during build. --keep Keep the initramfs temporary directory for debugging purposes. /var/log/dracut.log logfile of initramfs image creation /tmp/dracut.log logfile of initramfs image creation, if /var/log/dracut.log is not writable /etc/dracut.conf see dracut.conf 5 /etc/dracut.conf.d/*.conf see dracut.conf 5 /etc/conf.d/ Any files found in /etc/conf.d/ will be sourced in the initramfs to set initial values. Command line options will override these values set in the configuration files. /etc/cmdline Can contain additional command line options. The dracut command is part of the dracut package and is available from https://dracut.wiki.kernel.org dracut.kernel 7 dracut.conf 5