INITRAMFS.CONF(5)initramfs.conf manual INITRAMFS.CONF(5)NAMEinitramfs.conf - configuration file for mkinitramfs
DESCRIPTION
The behaviour of mkinitramfs 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/mkinitramfs/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 directly.
GENERAL VARIABLES
MODULES
Specifies the modules for the initramfs image.
Modules listed in /etc/initramfs-tools/modules and
/usr/share/initramfs-tools/modules.d/* are always included in
the initramfs, and are loaded early in the boot process.
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.
BUSYBOX
Include busybox utilities for the boot scripts. If set to 'n'
mkinitramfs will build an initramfs without busybox. Beware
that many boot scripts need busybox utilities.
COMPRESS
Specifies the compression method used for the initramfs image.
mkinitramfs will default to gzip if the kernel lacks support
(CONFIG_RD) or the corresponding userspace utility is not
present.
UMASK Set the umask value of the generated initramfs file. Useful to
not disclose eventual keys.
COMPCACHE_SIZE
Amount of RAM to use for RAM-based compressed swap space. The
default is not to use compcache.
An empty value - compcache isn't used, or added to the initramfs
at all.
An integer and K (e.g. 65536 K) - use a number of kilobytes.
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.
NFS VARIABLES
BOOT 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.
DEVICE
Specifies the network interface, like eth0.
ROOT Allows optional root bootarg hardcoding, when no root bootarg
can be passed. A root bootarg overrides that special setting.
NFSROOT
Defaults to auto in order to pick up value from DHCP server.
Otherwise you need to specify HOST:MOUNT.
FILES
/etc/initramfs-tools/initramfs.conf
AUTHOR
The initramfs-tools are written by Maximilian Attems <maks@debian.org>,
Jeff Bailey <jbailey@raspberryginger.com> and numerous others. Loosely
based on mkinitrd.conf by Herbert Xu.
SEE ALSOinitramfs-tools(8), mkinitramfs(8), update-initramfs(8).
Linux 2010/11/22 INITRAMFS.CONF(5)
