Below mentioned are the steps to reinstall a corrupted or mistakenly deleted grub (for RedHat and CentOS systems only) using the rescue mode ::
1> Boot the system from any boot installation medium like a RedHad #1 CD-ROM or a Flash Drive, etc.
2> Use the linux rescue command as shown below at the installation prompt to enter the rescue environment:
3> Type the command below to mount the root partition:
4> Type the command below to reinstall the GRUB boot loader, where /dev/hda is the boot partition.
*where /dev/hda is the boot partition
5> Go through the /boot/grub/grub.conf file once again, as additional entries may be needed for GRUB so as to make any custom changes there (like controlling another installed operating system)
Step 6> Finally, reboot the system
1> Boot the system from any boot installation medium like a RedHad #1 CD-ROM or a Flash Drive, etc.
2> Use the linux rescue command as shown below at the installation prompt to enter the rescue environment:
Quote:
| linux rescue |
3> Type the command below to mount the root partition:
Quote:
| chroot /mnt/sysimage |
4> Type the command below to reinstall the GRUB boot loader, where /dev/hda is the boot partition.
Quote:
| /sbin/grub-install /dev/hda |
5> Go through the /boot/grub/grub.conf file once again, as additional entries may be needed for GRUB so as to make any custom changes there (like controlling another installed operating system)
Step 6> Finally, reboot the system
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