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KB450238 – Recovering a Corrupted CentOS Boot Partition

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Scope/Description

How to repair a CentOS installation that is stuck booting into GRUB.

 

Prerequisites

  • A unit that is unable to properly boot into CentOS
  • Access to the IPMI management port on the 45 Drives unit
  • Java installed for ISO mounting
  • ISO for the matching version of CentOS 7 downloaded

 

Steps

  • Open the Java IPMI management tool from the IPMI web GUI

 

 

  • Click “Virtual Media”, followed by “Virtual Storage”.

 

 

  • Select the drive type. In this case, ISO, and navigate to the file

 

 

  • Click “Plug In” then “OK”

 

  • Reboot the unit using “Power Control” and “Set Power Reset”. When the unit is reboot, hammer the F11 key until the boot menu appears.

 

  • Select ATEN Virtual CDROM YSOJ

 

 

  • Select Troubleshooting, then Rescue a CentOS System


 

 

  • This will boot the unit into Anaconda Recovery mode. From here, we can repair the OS installation.

 

  • Enter 1 to continue

 

  • Press enter to engage the shell, then input “chroot /mnt/sysimage” to enter bash.

 

  • From here, we can use lsblk to identify which drives are being used as our boot drives. In this case, it’s sda and sdb

 

  • Next step is to re-write the MBR of the boot devices using grub2install. If you have redundant boot drives, you will have to repeat this step for both devices.

 

  • Navigate to /boot/grub2 and check the directory. Grub.cfg should be present.

 

  • From here, we’ll need to generate a new grub.cfg file using the following command:
    grub2-mkconfig -o /boot/grub2/grub.cfg

 

  • Exit from chroot and reboot the system using init 6 in the shell.

Verification

  • Boot into the OS and ensure it will properly post.
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