initramfs.conf man page on ElementaryOS

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INITRAMFS.CONF(5)	     initramfs.conf manual	     INITRAMFS.CONF(5)

       initramfs.conf - configuration file for mkinitramfs

       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.

	      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

	      The default setting is most.

	      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.

	      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

	UMASK Set  the umask value of the generated initramfs file.  Useful to
	      not disclose eventual keys.

	      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

	      You  can	optionally  install the compcache package to configure
	      this setting via debconf and have userspace scripts to load  and
	      unload compcache.

	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.

	      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.

	      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 <>,
       Jeff Bailey <> and numerous others.  Loosely
       based on mkinitrd.conf by Herbert Xu.

	initramfs-tools(8), mkinitramfs(8), update-initramfs(8).

Linux				  2010/11/22		     INITRAMFS.CONF(5)

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