revert to old kernel help ?
Clifton Royston
cliftonr at tikitechnologies.com
Mon May 9 14:11:49 PDT 2005
On Mon, May 09, 2005 at 09:50:52AM -0400, Brent wrote:
> Hello, im running Freebsd 4.10 , When i first setup this box i re-compiled
> the kernel for firewalling and such...which worked great ...i then tried to
> tighten the box down even further...by compileing ICMP_BANDLIM which caused
> problems for my webserver. Anywho ...is there a way i can tell my Freebsd box
> when it power cycles to boot the old kernel automatically ? At this point im
> having to tell it manually to load kernel.old
>
> any help is greatly appreciated
Your last previous kernel and module set should normally be saved as
the file /kernel.old and the directory /modules.old/ on your root file
system.
If you haven't gone through multiple build cycles, you can do this, or
the equivalent steps:
# cd /
# ln kernel kernel.bad && mv kernel.old kernel
# mv modules modules.bad && mv modules.old modules
Then reboot:
# shutdown -r now 'Reboot into restored kernel'
If you went through multiple build cycles with the new parameters,
then you're torqued; you'll need to go through a fresh build cycle with
a corrected kernel config. This is why it's a good idea to back up a
known good copy of your kernel and modules before you start tinkering.
Doesn't hurt to always keep a GENERIC kernel around too.
-- Clifton
--
Clifton Royston -- cliftonr at tikitechnologies.com
Tiki Technologies Lead Programmer/Software Architect
"I'm gonna tell my son to grow up pretty as the grass is green
And whip-smart as the English Channel's wide..."
-- 'Whip-Smart', Liz Phair
More information about the freebsd-questions
mailing list