Section: File Formats Manual (5)
initramfs.conf - configuration file for mkinitramfs
The behaviour of
can be modified by its configuration file.
Each line in the file can be a configuration variable, a blank line,
or a comment. The value of an variable is assigned by an statement
of the form: name=[value]
Configuration options can be broken out into configuration snippets and
placed in individual files in the /etc/initramfs-tools/conf.d directory. Files
in this directory are always read after the main configuration file,
so you can override the settings in the main config file without editing it
Specifies the modules for the initramfs image.
/usr/share/initramfs-tools/modules.d/* are always included in the
initramfs, and are loaded early in the boot process.
Modules listed in
list doesn't load any additional modules at boot time, other than those
listed in the above files.
most adds most file system, all ata, sata, scsi and usb drivers.
dep tries to guess which modules are necessary for the running box and
only adds those modules.
netboot adds the base and network modules, but skips block devices.
The default setting is most.
Include busybox utilities for the boot scripts.
If set to 'n'
will build an initramfs without busybox.
Beware that many boot scripts need busybox utilities.
Amount of RAM to use for RAM-based compressed swap space.
The default is not to use compcache.
65536 K) - use a number of kilobytes.
An empty value - compcache isn't used, or added to the initramfs at all.
An integer and K (e.g.
An integer and M (e.g. 256 M) - use a number of megabytes.
An integer and G (e.g. 1 G) - use a number of gigabytes.
An integer and % (e.g. 50 %) - use a percentage of the amount of RAM.
You can optionally install the compcache package to configure this
setting via debconf and have userspace scripts to load and unload compcache.
Specifies the compression method used for the initramfs image.
will default to gzip if the kernel lacks support (CONFIG_RD) or the
corresponding userspace utility is not present.
Set the umask value of the generated initramfs file.
Useful to not disclose eventual keys.
Allows one to use an nfs drive as the root of the drive.
The default is to boot from local media (hard drive, USB stick).
Set to nfs for an NFS root share.
The size of the /run tmpfs mount point in bytes (suffixes are supported)
or as percentage of your physical RAM. This parameter is used as the value of
the size mount option to tmpfs. See
details. Can be overridden by an optional initramfs.runsize= bootarg.
The default is 10%.
VARIABLES FOR LOCAL BOOT
Specifies the device used for suspend-to-disk (hibernation), which the
initramfs code should attempt to resume from. If this is not defined
or is set to auto,
will automatically select the largest available swap partition.
Set it to none to disable resume from disk.
VARIABLES FOR NFS BOOT
Specifies the default network interface to use, like eth0. The ip or
BOOTIF bootargs may override this.
Allows optional root bootarg hardcoding, when no root bootarg can be passed.
A root bootarg overrides that special setting.
Defaults to auto in order to pick up value from DHCP server.
Otherwise you need to specify HOST:MOUNT.
The initramfs-tools are written by Maximilian Attems <email@example.com
Jeff Bailey <firstname.lastname@example.org
> and numerous others.
Loosely based on mkinitrd.conf by Herbert Xu.