1. Get password to enter kernel
Ø Insert the 1st CD of Linux
Ø Boot: linux rescue [Enter]
Ø Language: English [Enter]
Ø Keyboard: US [Enter]
Ø Yes/No [Enter]
Ø Continue [Enter]
Ø Ok [Enter]
Ø chroot /mnt/sysimage à to work in root user.
ü [#] vi /etc/grub.conf
password = 1234 à write this line below or upper of hide menu line
2. Get root password
ü Insert CD and take the above steps.
ü [#] vi /etc/passwd
delete password [:x: à ::]
root: x: 0:0: root: /root/bin/bash
ü Reboot the machine and login without root password and then write
ü [#] passwd à and change the root password.
Or
ü Reboot the server by Alt+ctrl+del
ü When booting option come select Linux à press e for edit run level à select Kernel (2nd option) à e à give a space and write 1 (run level) or single or single b or single boot (single user mode to change password) à Enter à b
ü After login write Passwd and give a new password root
3. Recover Linux boot loader.
ü Insert CD and take the above steps.
ü [#] fdisk –l à See the hard disk is hda or hdb
ü [#] grub-install /dev/hdc
ü [#] reboot
4. Reboot the machine during startup
ü [#] vi /etc/rc.local à This file execute during startup a machine
erase reboot or give hash before reboot to inactive the command.
ü [#] reboot
Or
ü Reboot the server by Alt+ctrl+del
ü When booting option come select Linux à press e for edit run level à select Kernel (2nd option) à e à give a space and write 1 (run level) or single or single b or single boot (single user mode to change password) à Enter à b
ü After login write vi /etc/inittab and change the run level form 0 or 6 to 3
5. Retrieve file and data loss due to power loss before save the file.
ü During editing a file if the power goes down before save it the file will save as .abc.swp format where abc is the original file name.
ü [#] vi -r abc à To recover the file and it’s data
ü [#] rm .abc.swp à Delete the .swp file that created for power loss.
6. dsafda
