Re: Safe remote kernel install howto (Re: [Bugme-new] [Bug 6613] New: iptables broken on 32-bit PReP (ARCH=ppc))

[Michael Tokarev <mjt@tls.msk.ru>]

Ingo Oeser wrote:
> Hi Meelis,
> 
>> Unfortunatlety, 2.6.15 does not boot on this machine so I'm locked out 
>> remotely at the moment.
> 
> Here it my paranoid boot setup:
> 
> 1. Use "lilo -R new-kernel", to boot a kernel only
>     once and reboot the default kernel next time.
> 
> 2. Force reboot on any panic after 10 seconds:
> 	append="panic=10" in /etc/lilo.conf
> 
> 3. Schedule automatic reboot in case of impossible login
> 	echo "/bin/sync; /sbin/reboot -f "|at now + 15min

Instead of this, I usually use a system startup script like this:

case "$(cat /proc/cmdline)" in
 *linux-test*)
   (sleep 300; [ -f /var/run/noreboot ] || reboot) &
   ;;
esac

which means that if the kernel image is named 'linux-test', it will
be rebooted in 15 minutes after booting if no /var/run/noreboot file
exist.  So if I'm able to log in, i just touch /var/run/noreboot and
be done with it.

And oh, yes, for this to work, in lilo.conf the new entry should be
labeled linux-test -- ie, install new kernel, add new entry into lilo.conf
with label=linux-test, run `lilo && lilo -R linux-test && init 6' and..
wait ;)  After successeful reboot (and touching /var/run/noreboot), edit
lilo.conf, restore the proper label, set proper order of entries if needed
and re-run lilo.

/mjt