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>