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Full Discussion: Script to automatically reboot to newly compiled kernel with fallback
Top Forums UNIX for Dummies Questions & Answers Script to automatically reboot to newly compiled kernel with fallback Post 302382982 by tridus_08 on Sunday 27th of December 2009 09:16:45 PM
Old 12-27-2009
Script to automatically reboot to newly compiled kernel with fallback
Hi,
I'm new here. Just started playing around with kernel compilation.
I need a little bit of advice.
I'm trying to do a bash script to automatically compile a kernel package and reboot to that new kernel by default, with fallback to the old kernel.
So far, I'm getting stuck at the part where I need to reboot and load the new kernel as default.
I'm intending for this script to be used on systems using grub (legacy).

If I'm not wrong, I would need to change the menu.lst file to something like this:
Code:
default saved
fallback 1
timeout 5

title New, kernel 2.x.xa
root (hd0,0)
kernel /new root=/dev/sda1
initrd /boot/initrd.img-2.x.xa
savedefault 1

title Orig, kernel 2.x.xb
root (hd0,0)
kernel /old root=/dev/sda1
initrd /boot/initrd.img-2.x.xb

title Other, kernel 2.x.xc
root (hd0,0)
kernel /old root=/dev/sda1
initrd /boot/initrd.img-2.x.xc

If so, how should I go about to manipulate the menu.lst file?
I'm guessing that I might need to use awk to parse through the file, count the entries to get the entry number of the new kernel and the original kernel.
If that is the case, how can I do that with awk? (Not too good with awk, I usually use sed. )
Or are there better alternatives to this?
Thanks in advance.
Last edited by pludi; 12-28-2009 at 02:42 AM.. Reason: code tags, please...
 

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LEARN ABOUT SUNOS

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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