hi ya bruno
On Sun, 23 Oct 2005, Bruno Costacurta wrote:
> I'm looking for procedure / howto about creating rescue CD disk.
proceedure .. "think" :-) ..
- find out what hardware chipset is in your pc
- find out what kernel you're using
- save the kernel and /lib/modules/<kernel>
- save your partition info
- save your list of apps installed
- save your list of config files installed
- add dressing so that you can do something
( bash, libc, networking, fs-check apps, ... )
- how much time will have you "rescue" the dead box ?
5min .. 5hrs .. 5 days .. would dictate how you implement
your rescue cd
- depending on what you want to rescue .. existing
"rescue" cd's will not have your config files and setup
- or do you want rescue to save a corrupt fs vs
a backup of your /home and config changes which
is not the same as rescue
- booting the pc is not the same as rescue either
how complicated do you want to get ...
- why start with the hardest way to rescue a system ?
0) dd if=/boot/vmlinuz of=/dev/fd0
- as long as your kernel is 1.2MB and you have the network
modules you can always boot can get online
1) do a fancier boot floppy with ( lilo or grub or syslinux ) menu
- lots of howto's
2) stick a 2nd disk into the same system ... and mirror your boot info
and may as well copy your /home/bruno directories too
3) use raid ... in case hda dies ... your properly configured raid
will boot off hdc instead
4) make a bootable usb-stick ( more space than a floppy )
this is the simplest "1 minute change" but assumes your
system supports usb-hdd-boot and your system has the usb
driver modules
lilo -C /etc/lilo.hda.conf
--> change to boot=/dev/hda to boot=/dev/sda
more tweeking (2 min) of menu.lst for "grub-install /dev/sda"
4) setup (pxe) network boot ... so that you always boot off the network
as long as the pxe server is running
5) use an existing "standalone" cdrom
- you're assuming the kernel on the cdrom supports your hw
or else it's worthless for rescuing your hardware
6) make your own standalone cdrom
- little more work ... but more fun
- rescue cd needs initrd.gz and rootfs ....
and you'd need to make an iso of the whole thing
hacking a existing knoppix is easy but is too big
of a rescue disk
7) test and retest from different failures
8) endless list with more variances and differences of how to boot it
c ya
alvin
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