Re: Help really needed: Formatted / partition by accident.
nick lidakis wrote:
I was having trouble with my monowall router running off a compact
flash. I decide to reinstall the monowall boot image onto the CF card.
In the process I must have mistyped and accidentally wrote the image to
my boot partition i.e. /dev/sda1. The machine now boots into monowall
instead of Grub.
Using Google, I can only find articles or HOWTO's on recovering a
corrupt or overwritten master boot record.
It sounds as if you have created a new filesystem on /dev/sda1 which
used to be your root partition, so it's not only an issue with the MBR.
For the rest of my answer, I am assuming this.
> When I did the initial
installation with the latest the net install cd I chose the default
desktop partition scheme, which I believe (if I am not mistaken) was /,
/usr, and a home partitions. / would have my kernels, root directory and
So my question is, how do I proceed? I can use a rescue CD to boot into
the system and mount /, but how would I reinstall what would normally be
in /? Do I do a reinstall and skip formatting / home?
You could boot from the rescue CD (assuming it's a Debian one) and mount
/dev/sda1 to, say, /mnt/sda1. Then you do 'debootstrap /mnt/sda1' which
will install a Debian System on /mnt/sda1 (your / partition), then
chroot into /mnt/sda1, adjusting your bootloader config and run the
bootloader to install the MBR.
Of course you can keep your /home - just mount it into the new system.
With the partition used as /usr it's going to be a bit more difficult as
it contains system files from your old installation; if you can, wipe
it out and use it as /usr in your new system. So basically you'd do
(from the rescue system):
$ mkdir -p /mnt/sda1
$ mkfs -t ext3 /dev/sda1 # this will destroy your monowall
$ mount /dev/sda1 /mnt/sda1
$ mkdir /mnt/sda1/home
$ mount /dev/sdaX /mnt/sda1/home # sdaX is the partition where /home
$ mkfs -t ext3 /dev/sdaY # sdaY is the partition used as /usr
# everything that used to be on /usr will
# be destroyed
$ mkdir /mnt/sda1/usr
$ mount /dev/sdaY /mnt/sda1/usr
$ debootstrap /mnt/sda1
$ chroot /mnt/sda1
[configure your bootloader]
/dev/sda1 / ext3 defaults 0 0
/dev/sdaX /home ext3 defaults 0 0
/dev/sdaY /usr ext3 defaults 0 0
/dev/sdaZ none swap sw 0 0
proc /proc proc defaults 0 0
That should be it. You'll lose your old root-partition (which you
already did, I think, by installing monowall on /dev/sda1) and your old
/usr partition. You should be able to keep /home.
If there's anything important on /usr, you can of course save that as
you can still access this partition with the rescue cd.
Any help at all would be appreciated!