dracut.conf(5) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | FILES | AUTHOR | SEE ALSO | COLOPHON

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

NAME         top

       dracut.conf - configuration file(s) for dracut

SYNOPSIS         top

       /etc/dracut.conf /etc/dracut.conf.d/*.conf
       /usr/lib/dracut/dracut.conf.d/*.conf

DESCRIPTION         top

       dracut.conf is loaded during the initialisation phase of dracut.
       Command line parameter will override any values set here.

       *.conf files are read from /usr/lib/dracut/dracut.conf.d and
       /etc/dracut.conf.d. Files with the same name in
       /etc/dracut.conf.d will replace files in
       /usr/lib/dracut/dracut.conf.d. The files are then read in
       alphanumerical order and will override 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.

       dracut command line options will override any values set here.

       Configuration files must have the extension .conf; other
       extensions are ignored.

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

       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. This option forces dracut to only
           include the specified dracut modules. In most cases the
           "add_dracutmodules" option is what you want to use.

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

       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.

       force_drivers+=" <list of kernel modules> "
           See add_drivers above. But in this case it is ensured that
           the drivers are tried to be loaded early via modprobe.

       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.

       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.

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

       compress="{cat|bzip2|lzma|xz|gzip|lzo|lz4|zstd|<compressor [args
       ...]>}"
           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 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. To
           disable compression, use "cat".

       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.

       hostonly_cmdline="{yes|no}"
           If set to "yes", store the kernel command line arguments
           needed in the initramfs

       persistent_policy="<policy>"
           Use <policy> to address disks and partitions.  <policy> can
           be any directory name found in /dev/disk. E.g. "by-uuid",
           "by-label"

       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.

       add_device+=" <device> "
           Bring up <device> in initramfs, <device> should be the device
           name. This can be useful in hostonly mode for resume support
           when your swap is on LVM an encrypted partition.

       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.

       ro_mnt="{yes|no}"
           Mount / and /usr read-only by default.

       kernel_cmdline="parameters"
           Specify default kernel command line parameters

       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)

       acpi_override="{yes|no}"
           [WARNING] ONLY USE THIS IF YOU KNOW WHAT YOU ARE DOING!

           Override BIOS provided ACPI tables. For further documentation
           read Documentation/acpi/initrd_table_override.txt in the
           kernel sources. Search for ACPI table files (must have .aml
           suffix) in acpi_table_dir= directory (see below) and add them
           to a separate uncompressed cpio archive. This cpio archive
           gets glued (concatenated, uncompressed one must be the first
           one) to the compressed cpio archive. The first, uncompressed
           cpio archive is for data which the kernel must be able to
           access very early (and cannot make use of uncompress
           algorithms yet) like microcode or ACPI tables (default=no).

       acpi_table_dir="<dir>"
           Directory to search for ACPI tables if acpi_override= is set
           to yes.

       early_microcode="{yes|no}"
           Combine early microcode with ramdisk (default=yes)

       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 the name of the included modules to standard output
           during build.

       i18n_vars="<variable mapping>"
           Distribution specific variable mapping. See
           dracut/modules.d/10i18n/README for a detailed description.

       i18n_default_font="<fontname>"
           The font <fontname> to install, if not specified otherwise.
           Default is "eurlatgr".

       i18n_install_all="{yes|no}"
           Install everything regardless of generic or hostonly mode.

       reproducible="{yes|no}"
           Create reproducible images.

       loginstall="<DIR>"
           Log all files installed from the host to <DIR>.

       uefi_stub="<FILE>"
           Specifies the UEFI stub loader, which will load the attached
           kernel, initramfs and kernel command line and boots the
           kernel. The default is
           /lib/systemd/boot/efi/linux<EFI-MACHINE-TYPE-NAME>.efi.stub
           or /usr/lib/gummiboot/linux<EFI-MACHINE-TYPE-NAME>.efi.stub

       uefi_splash_image="<FILE>"
           Specifies the UEFI stub loader’s splash image. Requires
           bitmap (.bmp) image format.

       uefi_secureboot_cert="<FILE>", uefi_secureboot_key="<FILE>"
           Specifies a certificate and corresponding key, which are used
           to sign the created UEFI executable. Requires both
           certificate and key need to be specified and sbsign to be
           installed.

       kernel_image="<FILE>"
           Specifies the kernel image, which to include in the UEFI
           executable. The default is
           /lib/modules/<KERNEL-VERSION>/vmlinuz or
           /boot/vmlinuz-<KERNEL-VERSION>

FILES         top

       /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 override the values in
           /etc/dracut.conf. The configuration files are read in
           alphanumerical order.

AUTHOR         top

       Harald Hoyer

SEE ALSO         top

       dracut(8) dracut.cmdline(7)

COLOPHON         top

       This page is part of the dracut (event driven initramfs
       infrastructure) project.  Information about the project can be
       found at ⟨https://dracut.wiki.kernel.org/index.php/Main_Page⟩.
       If you have a bug report for this manual page, send it to
       initramfs@vger.kernel.org.  This page was obtained from the
       project's upstream Git repository
       ⟨git://git.kernel.org/pub/scm/boot/dracut/dracut.git⟩ on
       2021-04-01.  (At that time, the date of the most recent commit
       that was found in the repository was 2021-02-23.)  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original
       manual page), send a mail to man-pages@man7.org

dracut 050-166-g811c8146       10/25/2020                 DRACUT.CONF(5)

Pages that refer to this page: dracut.cmdline(7)dracut(8)