Accidentally deleted config file....how to restore it?

gauravholey · 06-22-2009, 03:54 AM

hi there,

I have accidentally deleted the config file under the boot directory...i am using kernel 2.6.25 ...please help me to restored it....i have tried using make oldconfig && make prepare...but it did not work....but still i am able to boot through the same kernel using grub(i have 2-3 kernel images installed on my machine)....i can access the internet...but the area of concern is that i am not able to compile the kernel modules...?...Please help...every help would be greatly appreciated...

Best Regards,
Gaurav Holey

jomen · 06-22-2009, 04:22 AM

...if the current kernel was compiled that way you can use:

Code:

zcat /proc/config.gz > /usr/src/linux/.config.current

to have the config of the currently running kernel copied to: /usr/src/linux/.config.current
Rename/copy that to .config or .config.old and start over using that.

You can always start from scratch too.
make mrproper
or
make distclean
or just
make clean
and then
make menuconfig
...

HTH

jsteel · 06-22-2009, 04:31 AM

What distribution are you using? You should be able to reinstall your kernel which should then put the configuration file back in your /boot/ directory.

gauravholey · 06-22-2009, 05:44 AM

hi there,

after doing zcat /proc/config.gz > /usr/src/linux/.config.current I got the following

gzip: /proc/config.gz: No such file or directory.

i am using fedora core7.

i have compiled and installed kernel manually...not using yum or rpm..just in case for info.

i have tried building it from scratch i.e make clean,make menuconfig...i got the following error

make: *** No rule to make target `menuconfig'. Stop.

Gaurav Holey

jomen · 06-22-2009, 07:53 AM

Quote:

after doing zcat /proc/config.gz > /usr/src/linux/.config.current I got the following

gzip: /proc/config.gz: No such file or directory

that just means this feature (having the current config available from there) was not used when your kernel was compiled.

What jsteel suggested should be an option...

I have no idea what the cause of this could be - sorry.

Code:

make: *** No rule to make target `menuconfig'. Stop.

edit:
...apart from you not being in the right directory when you issued this command

- which should be /usr/src/linux (possibly /usr/src/linux_version_)
end edit

Still there is "make config" and "make xconfig" and maybe even other graphical tools...I don't know Fedora well enough to be specific.