Rescue mode allows you to boot a small Linux environment entirely from a diskette, CD- ROM, or use another method.
However, there may be times
when you cannot get Linux running completely enough to access files on the hard
drive of your system. Rescue mode, you can access files stored on the hard
drive of your machine's files, even if you cannot run Linux from that hard
drive.
In general, you have to go
into rescue mode for one of two reasons:
You are unable to boot Linux.
You encounter hardware or software problems,
and want to recover some important files off the hard drive of your system.
Linux Rescue and Single User Troubleshooting
# if you find kernel panic
error due to an incorrect configuration, follow the steps below.
If any configuration error occurs
on the grub.conf file then boot in single user mode.
How to start a single user mode
Press "E" for
editing in the first GRUB screen after POST.
Changes to the boot line
Put "single" in
spite of "RO"
Press "B" to boot
the system that will move you in the Root shell, update the configuration file
with the appropriate options and reboot the machine or start another init.
If the error in /etc/fstab
error will be
Type Control+d to continue...
To resolve this error using
the linux rescue boot CD first
After booting and initiating
rescue command we need to mount hdd in any test directory.
# chroot /mnt/sysimage
Knowing the label mount
#e2lable /dev/hda2 (of hda of root partition. Let say it is 2.
#mkdir test
#mount /dev/hda2 test
then edit the file which
ever you require in default state.
# vi test/etc/fstab
# vi test/etc/passwd Extra first put directory name before path.
How to know in which run
level you are:
#run level
#tty (To find out in which terminal you are)
