How to reinstall the Grub Boot loader on Dedicated Linux Server

Below steps will help to rebuild / reinstall the corrupted or unknowingly deleted Grub Boot loader using the rescue mode in Redhat / Centos.
  • Boot the system from Redhat / Centos Installation Disk/DVD or Flash Drive
  • Type the ‘linux rescue’ command at the installation prompt to enter into the rescue environment.
  • Type the command  ‘chroot /mnt/sysimage’ to mount the root partition.
  • Type the command ‘/sbin/grub-install /dev/sda’ to reinstall the GRUB BOOT LOADER here boot partition is there in 'sda'. 
  •  Review the /boot/grub/grub.conf.
  •  Then Reboot the server

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