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Modifying GRUB2 Boot Configuration (CentOS)

The GRUB2 bootloader provides many improvements over its predecessor GRUB. This includes support for UUIDs, LVM, and RAID, and a more programmatic approach to configuration. In this hands-on lab, we have been tasked with updating the GRUB configuration and applying these changes.

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 30m
Last updated
Clock icon Aug 28, 2025

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Table of Contents

  1. Challenge

    Update /etc/default/grub

    Use a text editor to edit /etc/default/grub and ensure that the following options and values are present:

    GRUB_TIMEOUT=45
GRUB_DEFAULT=saved
GRUB_SAVEDEFAULT=true

  2. Challenge

    Create a Custom Menu Entry

    Copy the menuentry for a line that starts with menuentry 'CentOS Linux (3.10...) /boot/grub2/grub.cfg and add it to /etc/grub.d/40_custom.

    Once copied, remove the rhgb and quiet options from the kernel line and change the title to Verbose Output Enabled.

  3. Challenge

    Create a Backup of the Configuration File

    Use the cp command to create a backup of grub.cfg.

    cp /boot/grub2/grub.cfg /boot/grub2/grub.cfg.bkp

  4. Challenge

    Generate a New Configuration File with the Changes

    Use the grub2-mkconfig command to generate a new grub.cfg file.

    grub2-mkconfig -o /boot/grub2/grub.cfg
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