Date: Mon, 9 May 2005 11:11:47 -1000 From: Clifton Royston <cliftonr@tikitechnologies.com> To: Brent <mrb@bmyster.com> Cc: questions@freebsd.org Subject: Re: revert to old kernel help ? Message-ID: <20050509211147.GF2626@tikitechnologies.com> In-Reply-To: <20050509134413.M37350@bmyster.com> References: <20050509134413.M37350@bmyster.com>
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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@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
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