1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
|
DRACUT.CONF(5)
==============
:doctype: manpage
:man source: dracut
:man manual: dracut
:man version: {version}
NAME
----
dracut.conf - configuration file(s) for dracut
SYNOPSIS
--------
_/etc/dracut.conf_
_/etc/dracut.conf.d/\*.conf_
_/usr/lib/dracut/dracut.conf.d/*.conf_
Description
-----------
_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_.
*force_add_dracutmodules+=*" __<dracut modules>__ "::
Force to add a space-separated list of dracut modules to the default set of
modules, when host-only mode is specified. This parameter can be specified
multiple times.
*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_.
*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.
*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.
*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.
*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 colon-separated list of directories where to look for
firmware files.
*libdirs+=*" __<dir>__[ __<dir>__ ...] "::
Specify a space-separated list of directories where to look for libraries.
*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|lzop|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".
*squash_compress=*"__{<compressor [args ...]>}__"::
Compress the squashfs image using the passed compressor and compressor
specific options for mksquashfs. You can refer to mksquashfs manual for
supported compressors and compressor specific options. If squash module is
not called when building the initramfs, this option will not take effect.
*do_strip=*"__{yes|no}__"::
Strip binaries in the initramfs (default=yes).
*aggressive_strip=*"__{yes|no}__"::
Strip more than just debug symbol and sections, for a smaller initramfs
build. The "do_strip=yes" option must also be specified (default=no).
*do_hardlink=*"__{yes|no}__"::
Hardlink files in the initramfs (default=yes).
*prefix=*" __<directory>__ "::
Prefix initramfs files with __<directory>__.
*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
(default=no).
*hostonly_mode=*"__{sloppy|strict}__"::
Specify the host-only mode to use (default=sloppy).
In "sloppy" host-only mode, extra drivers and modules will be installed, so
minor hardware change won't make the image unbootable (e.g. changed
keyboard), and the image is still portable among similar hosts.
With "strict" mode enabled, anything not necessary for booting the local
host in its current state will not be included, and modules may do some
extra job to save more space. Minor change of hardware or environment could
make the image unbootable.
*hostonly_cmdline=*"__{yes|no}__"::
If set to "yes", store the kernel command line arguments needed in the
initramfs. If **hostonly="yes"** and this option is not configured, it's
automatically set to "yes".
*hostonly_nics+=*" [__<nic>__[ __<nic>__ ...]] "::
Only enable listed NICs in the initramfs. The list can be empty, so other
modules can install only the necessary network drivers.
*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"), or "mapper" to use /dev/mapper device names (default=mapper).
*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_ (default=no).
*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 host-only mode for resume support when your swap is on
LVM an encrypted partition.
*mdadmconf=*"__{yes|no}__"::
Include local _/etc/mdadm.conf_ (default=no).
*lvmconf=*"__{yes|no}__"::
Include local _/etc/lvm/lvm.conf_ (default=no).
*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 (default=no).
*ro_mnt=*"__{yes|no}__"::
Mount _/_ and _/usr_ read-only by default (default=no).
*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\}__"::
Specify logging level for standard error (default=4).
[NOTE]
===============================
Logging levels:
----
0 - suppress any messages
1 - only fatal errors
2 - all errors
3 - warnings
4 - info
5 - debug info (here starts lots of output)
6 - trace info (and even more)
----
===============================
*sysloglvl*="__\{0-6\}__"::
Specify logging level for syslog (default=0).
*fileloglvl=*"__\{0-6\}__"::
Specify logging level for logfile (default=4).
*logfile=*"__<file>__"::
Path to logfile.
*sshkey=*"__<file>__"::
SSH key file used with ssh-client module.
*show_modules=*"__{yes|no}__"::
Print the name of the included modules to standard output during build
(default=no).
*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 host-only mode (default=no).
*reproducible=*"__{yes|no}__"::
Create reproducible images (default=no).
*noimageifnotneeded=*"__{yes|no}__"::
Do not create an image in host-only mode, if no kernel driver is needed
and no /etc/cmdline/*.conf will be generated into the initramfs
(default=no).
*loginstall=*"__<directory>__"::
Log all files installed from the host to _<directory>_.
*uefi=*"__{yes|no}__"::
Instead of creating an initramfs image, dracut will create an UEFI
executable, which can be executed by an UEFI BIOS (default=no).
The default output filename is
_<EFI>/EFI/Linux/linux-$kernel$-<MACHINE_ID>-<BUILD_ID>.efi_.
<EFI> might be _/efi_, _/boot_ or _/boot/efi_ depending on where the ESP
partition is mounted. The <BUILD_ID> is taken from BUILD_ID in
_/usr/lib/os-release_ or if it exists _/etc/os-release_ and is left out,
if BUILD_ID is non-existent or empty.
*machine_id=*"__{yes|no}__"::
Affects the default output filename of the UEFI executable, including the
<MACHINE_ID> part (default=yes).
*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_.
*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.
*uefi_secureboot_engine=*"_parameter_"::
Specifies an engine to use when signing the created UEFI executable. E.g. "pkcs11"
*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>_.
*sbat=*"__parameters__"::
Specifies the SBAT parameters, which to include in the UEFI executable. By default
the default SBAT string added is "sbat,1,SBAT Version,sbat,1,
https://github.com/rhboot/shim/blob/main/SBAT.md".
*enhanced_cpio=*"__{yes|no}__"::
Attempt to use the dracut-cpio binary, which optimizes archive creation for
copy-on-write filesystems (default=no).
When specified, initramfs archives are also padded to ensure optimal data
alignment for extent sharing. To retain reflink data deduplication benefits,
this should be used alongside the **compress="cat"** and **do_strip="no"**
parameters, with initramfs source files, **tmpdir** staging area and
destination all on the same copy-on-write capable filesystem.
*parallel=*"__{yes|no}__"::
If set to _yes_, try to execute tasks in parallel (currently only supported
for _--regenerate-all_).
*initrdname=*"_<filepattern>_"::
Specifies the file name for the generated initramfs if it is not set otherwise.
The initrdname configuration option is required to match the _initr*${kernel}*_
file pattern and only one file with this pattern should exists in the
directory where initramfs is loaded from. Defaults to _initramfs-${kernel}.img_.
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 override the values in
_/etc/dracut.conf_. The configuration files are read in alphanumerical
order.
AUTHOR
------
Harald Hoyer
See Also
--------
*dracut*(8) *dracut.cmdline*(7)
|
