How to fix CentOS 7 unable to boot after installation?

1 year ago
Jackson Davis
2 minutes

If you are unable to access the system after installing CentOS 7, you can try the following methods to resolve the issue:

  1. Check hardware connections: make sure all hardware connections such as hard drives and memory are functioning properly.
  2. Access recovery mode: Select the CentOS 7 recovery mode at startup, which will take you to a command-line interface for repairing the system. You can attempt to fix the boot configuration or any other settings that may be causing issues.
  3. Check the boot configuration: Use the edit command to edit the boot configuration file to verify if there are any errors or missing configurations. The file is located at /boot/grub2/grub.cfg.
  4. Repair the bootloader: Use the startup repair tool to fix the bootloader. In recovery mode, run the following command to repair the GRUB bootloader:
chroot /mnt/sysimage
grub2-install /dev/sda
grub2-mkconfig -o /boot/grub2/grub.cfg
  1. Reinstall the boot loader: If repairing the boot loader doesn’t work, you can try reinstalling it. In recovery mode, run the following command to reinstall the GRUB boot loader:
chroot /mnt/sysimage
yum reinstall grub2-tools
grub2-install /dev/sda
grub2-mkconfig -o /boot/grub2/grub.cfg
  1. Check the file system: Use file system check tools (such as fsck) to check and repair errors in the file system. In recovery mode, run the following command to check and repair the file system:
fsck -f /dev/sdaX

/dev/sdaX is the root partition where CentOS 7 is installed.

If the above methods still cannot solve the problem, it is recommended that you try reinstalling CentOS 7 and ensure that no errors occur during the installation process.

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