Linux Miscellaneous Notes

DHCPD

See also: man dhcpd

Cloning Bootable System Disks

cleanly shutdown and power-off your computer, install the new drive, e.g., as hdb, then boot

duplicate disk partitions (or use your favorite fdisk tool to partition manually, e.g., for a larger disk)
# sfdisk -d /dev/hda > /tmp/hda.sfdisk
# sfdisk /dev/hdb < /tmp/hda.sfdisk

make file systems - choose one of the following:

1. for ext2

# mke2fs /dev/hdb1; mke2fs /dev/hdb5
2. for ext3

# mke2fs -j /dev/hdb1; mke2fs -j /dev/hdb5
3. to change ext2 to ext3

# tune2fs -j /dev/hdb1
# tune2fs -j /dev/hdb5

mount file systems
# mount /dev/hdb5 /mnt/tmp
# mkdir /mnt/tmp/boot
# mount /dev/hdb1 /mnt/tmp/boot

copy data - choose one of the following:

1. find/cpio for each fs mount point

# cd /; find boot -mount  -print0 | cpio -padum0 /mnt/tmp
# cd /; find . -mount -print0 | cpio -padum0 /mnt/tmp
# mkdir /mnt/tmp/mnt/tmp/cdrom /mnt/tmp/mnt/tmp/floppy
2. dump/restore

cd /mnt/tmp/boot; dump -0 -f - /boot | restore -r -f -
cd /mnt/tmp; dump -0 -f - / | restore -r -f -

make bootable
edit special lilo configuration file should have the following lines
# cd /mnt/tmp
# cp /etc/lilo.conf etc/lilo.conf.hdb
# ed etc/lilo.conf.hdb # make sure to edit the root= references to point to where the new disk will be, e.g., hda or sda
boot=/dev/hdb
disk=/dev/hdb
        bios=0x80
# ed etc/fstab # maker sure to edit any sda/hda changes that will take place
# lilo -r . -C /etc/lilo.conf.hdb # use -l if you have geometry problems "LI" or edit /etc/disktab to match BIOS boot geometry

finish
# sync
# umount /mnt/tmp/boot
# umount /mnt/tmp
# sync
# halt

reconfigure drives, e.g., slave to master, etc

Reiserfs root partition