Managing the System Bootloader in RHEL 8

15 minutes
  • 2 Learning Objectives

About this Hands-on Lab

The bootloader is the first software program that executes when the system starts, and it’s in control until it passes it to the kernel, which brings up the rest of the operating system. The GRUB bootloader in RHEL is highly configurable. In this hands-on lab, we will work with the system bootloader on RHEL 8.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Modify the System Bootloader
  1. Query the GRUB configuration files.
  2. Alter GRUB configuration options.
  3. Regenerate and install GRUB with the updates.
  4. Reboot and query the GRUB configuration.
Set and Test Default Kernel Options
  1. Query the installed kernels.
  2. Query and change the default kernel (index).
  3. Reboot and test configuration.
  4. Restore the original default kernel.

Additional Resources

In this lab, you're a junior sysadmin who is trying to find out how to make it, so that the menu for GRUB appears for long enough to be interruptable when needed. Your senior sysadmin has also told you to look and see if a serial troubleshooting tool can be attached to the system.

You'll be configuring those changes, regenerating and installing the updated version of GRUB's configuration, and testing it with a reboot.

While reviewing the GRUB configuration files, you notice there are several versions of the Kernel installed, and so you decide to investigate what is installed, what's available in GRUB, and what it takes to switch back to an older Kernel if an error occurs during boot.

Red Hat Exam Requirements Covered:

  • Modify the system bootloader

What are Hands-on Labs

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

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