How To Repair Centos 7 Install

This commodity will provide the step past step procedure to recover the Grub on REHL vii / CentOS 7. Chow corruption / lost is one of the about common issues on Linux servers/workstations. The possible reasons for chow abuse could be due to bad deejay/bug on the firmware or powered off the system abruptly. Systems ships with BIOS/ UEFI firmware and you lot should know what Os is using currently. Hither is the manner to identify BIOS vs UEFI on Linux servers. To recover GRUB on RHEL7 /CentOS vii, you must take the latest DVD or ISO image.

Common Errors in GRUB:

If Chow is corrupted or lost, the system will not boot and it will be stuck in grub like beneath.

GNU GRUB version 0.97 (638K lower / 3143616K uper memory)  [ Minimal BASH-like line editing is supported. For the first word. TAB lists possible command completions. Anywhere else TAB lists the possible  completions of a device/filename.]  grub>

The system gets stop with the following message.

Chow loading stage ii

In such cases, Delight follow the below instructions.

Recover/Restore the GRUB – BIOS Based system:

1. Insert RHEL 7 / CentOS seven latest DVD on the server or attach ISO image using ILO.
two. In case of a Virtual car, attach the ISO image to the VM.
three. Kicking the server using the DVD/ISO paradigm.

4. Cull troubleshooting selection once the system is booted in DVD/ISO.

RHEL7 CentOS7 - Troubleshooting Rescue Mode — RHEL7 CentOS7 – Troubleshooting Rescue Mode

5. Choose the rescue mode.

RHEL 7 - Rescue Mode — RHEL seven – Rescue Fashion

half-dozen. Press one to go on to find the OS prototype and get the vanquish prompt.

Continue - Rescue Mode - RHEL — Continue – Rescue Mode – RHEL

seven.chroot to the OS image.

chroot to OS Image - RHEL — chroot to Os Image – RHEL

viii. Starting RHEL 7/CentOS vii, GRUB ii is the default bootloader. The GRUB ii configuration file is/boot/grub2/chow.cfg.Install chow kick loader on root disk. (Default : /dev/sda).

grub2-install - RHEL 7 CentOS7 — grub2-install – RHEL seven CentOS7

9. Navigate to /boot/grub2 directory and ostend the existence of "grub.cfg" . Hither "chow.cfg" file is non exists.

grub.cfg is missing - RHEL 7 — grub.cfg is missing – RHEL 7

10. Permit's generate "grub.cfg" file.

grub2-mkconfig - Recreate grub.cfg — grub2-mkconfig – Recreate grub.cfg

If you are missing grub2-mkconfig command, install "grub2-tools.x86_64" bundle in rescue manner . Since you lot have booted from DVD, the package should exist available in that.

Chow.cfg recreated using grub2-mkconfig

11. Exit from the chroot and reboot the system.

This will piece of work only on BIOS-based X86 servers and virtual machines but will not work with UEFI firmware servers and VMs.

Hither is the link to identify that what firmware type was used to boot the organization.