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Full Discussion: change initramfs by hand?
Operating Systems Linux Debian change initramfs by hand? Post 302268903 by frankie06 on Tuesday 16th of December 2008 02:00:12 PM
Old 12-16-2008
Quote:
Originally Posted by otheus
Could you post your grub.conf file please?
Sure, but I don't think the grub.conf matters too much; it boots the original initrd just fine, and I don't modify any grub files when trying the new initrd.

BTW where is grub.conf? The only grub files I see are in /boot/grub, and the only human-readable ones are "default", "device.map" and "menu.lst". The first is empty except comments, the second only contains the lines

(hd0) /dev/hda
(hd1) /dev/sda

but seems to be unimportant as the unmodified initrd boots just the same when switching this to

(hd0) /dev/sda
(hd1) /dev/hda

and the third contains the usual kernel and initrd config, but it boots the unmodified initrd fine and I never modify it. Instead I change the link initrd.img in /boot to point to the modified initrd. There's still a grub entry using an initrd called initrd.img-2.6.26-1-686 which I never modify, and that always boots. Given that initrd.img-2.6.26-1-686 and the unmodified initrd.img are binary equal, the file menu.lst probably isn't the problem either.

Something else occured to me: do I need to specify the --format option in cpio? E.g. change from "bin" to "newc" format? Because when I look at the (gunzipped) initrd in boot with "file", it says:

"ASCII cpio archive (SVR4 with no CRC)".

But this is not the default which cpio creates.
 

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LEARN ABOUT V7

mkdumprd

MKDUMPRD(8)							   User Manuals 						       MKDUMPRD(8)

NAME

       mkdumprd - (Re)build the initramfs for kdump

SYNOPSIS

       mkdumprd [-h] [-q] [-f] [-k kernelver] [-i opts]

DESCRIPTION

       mkdumprd (re-)builds the kdump initrd. For kdump, a special initrd is used because

       o   the kdump initrd should include network modules and network configuration (and therefore is larger as the normal initrd used for
	   booting),

       o   the kdump initrd should use no splash screen,

       o   the kdump initrd includes kdumptool(8) and all required libraries.

       This script calls mkinitrd(8) with all required parameters. If the initrd already exists, it checks first if the configuration file or the
       kernel are newer, and only rebuilds the initrd if necessary.

OPTIONS

       All option parsing is done via the getopt(3) function, and therefore follows all standard command line parsing rules.

       -h | --help
	   Shows help output and exits.

       -k kernelversion
	   Specifies the kernel version. If no version is specified and also no kernel or initrd are specified, then mkdumprd uses kdumptool(8) to
	   find out the correct kernel and initrd.

       -K kernel
	   Specifies the kernel binary. If you specify that option, also specify -I.

       -I initrd
	   Specifies the resulting initrd. If you specify that option, also specify -K.

       -q
	   Be quiet. Don't output status messages. Used to call mkdumprd(8) from /etc/init.d/kdump init script.

       -i parameters
	   Append the specified parameters to mkinitrd(8) call.

FILES

       /etc/sysconfig/kdump
	   Kdump configuration. See kdump(5).

BUGS

       Please report bugs and enhancement requests at https://bugzilla.novell.com.

COPYING

       Copyright (c) 2008 Bernhard Walle <bwalle@suse.de>. Free use of this software is granted under the terms of the GNU General Public License
       (GPL), version 2 or later.

SEE ALSO

       kdumptool(8), mkinitrd(8), http://en.opensuse.org/Kdump

kdump 0.8.1							    07/05/2010							       MKDUMPRD(8)
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