On Sunday 23 October 2005 09:13, Alvin Oga wrote:
> 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

Thanks Alvin for all these details.
I decided to 'keep it simple' and will try a Knoppix.
Bye,
Bruno


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