Linux Boot Failure and Recovery Labs: CentOS 10 / RHEL 10

Linux Boot Failure and Recovery Labs: CentOS 10 / RHEL 10 | Udemy [Update 05/2026]
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Master Linux boot process, GRUB, kernel, initramfs & fix real failures using rescue & emergency modes with hands-on labs

What you’ll learn:
Understand the complete Linux boot process from BIOS/UEFI to systemd in CentOS 10 / RHEL 10
Boot into and use Emergency Mode to diagnose and fix critical system issues
Use Rescue Mode effectively to recover unbootable Linux systems
Troubleshoot and fix missing or corrupted initramfs issues step by step
Recover and rebuild GRUB configuration when bootloader files are missing or broken
Manually boot a system from the GRUB prompt during boot failure scenarios
Diagnose and fix kernel-related boot failures in Linux systems
Identify and repair issues caused by incorrect /etc/fstab configurations
Recover missing critical binaries like /bin/mount using rescue environments
Simulate real-world Linux failures and confidently restore system functionality
Understand Linux filesystem architecture and mount points.
Differentiate between disk-based and memory-based (tmpfs) filesystems.
Understand the purpose of important Linux filesystems such as /, /boot, /dev, /run, and /dev/shm.
Learn how tmpfs and devtmpfs work in Linux systems.
Understand user runtime and shared memory filesystems in Linux.

Linux Boot Failure & Recovery Labs: CentOS 10 / RHEL 10

Struggling with Linux systems that fail to boot? Want to confidently fix real production issues instead of just reading theory?

This course is designed to give you hands-on expertise in Linux boot troubleshooting and system recovery using CentOS 10 and RHEL 10. Instead of boring theory, you’ll work through real-world failure scenarios that system administrators actually face.

Section 1: CentOS 10 Installation on Oracle VirtualBox – Complete Guide

An Overview of This Section

Download and Install VirtualBox

Download CentOS 10 ISO

Create a New Virtual Machine

Configure the Virtual Machine

Configure Virtual Hardware

Hard Disk File Type and Format

Uncheck – Proceed with Unattended Installation

Begin the Installation

Configure Installation Summary

Access Linux VM from Windows using MobaXterm

Section 2: Understanding the Linux Filesystem Hierarchy

What You Will Learn in This Section

Linux Filesystem Explained

Understanding Disk-Based Filesystems

Memory-Based (tmpfs) Filesystem

Understanding the Root ( / ) Filesystem in Linux

Understanding devtmpfs Filesystem in Linux

Understanding tmpfs Shared Memory Filesystem in Linux

Understanding tmpfs Mounted on /run

tmpfs Filesystem for systemd-journald Service

Understanding the /boot Filesystem in Linux

Understanding /run/user tmpfs Filesystem

Section 3: Linux Boot Process (CentOS 10 / RHEL 10)

Section 4: Rescue and Emergency Mode in Linux

Linux Emergency Mode: Overview and Use Cases

Steps to Boot into Emergency Mode in Linux

Lab: Boot into Emergency Mode and Fix Issues

Linux Rescue Mode: Overview and Use Cases

Steps to Boot into Rescue Mode in Linux

Lab: Boot into Emergency Mode via GRUB (Edit Method)

Lab: Boot into Emergency Mode Using CentOS ISO Image

Scenario 1: Initramfs File Missing – Diagnosis & Fix

Scenario Overview

Simulating the Failure: Missing Initramfs

Recreate Initramfs from Rescue Mode

Scenario 2: GRUB Configuration File Missing – Diagnosis & Fix

Scenario Overview

Simulating the Failure: Missing GRUB Configuration File

Manual Boot from GRUB Prompt

Recreating GRUB Configuration Using grub2-mkconfig

Scenario 3: BIOS Boot Partition Corrupted – Diagnosis & Fix

Understanding the BIOS Boot Partition

Identify BIOS Boot Partition

Corrupt BIOS Boot Partition Using dd (Simulate Failure)

Fix Boot Failure: Reinstall GRUB from Rescue Mode

Scenario 4: Missing Critical Binary (/bin/mount) – Diagnosis & Fix

Scenario Overview

Simulating the Failure: Missing /bin/mount Binary

Recover /bin/mount via Package Reinstall (Rescue Mode)

Scenario 5: Kernel Missing/Corrupted – Diagnosis & Fix

Simulating the Failure: Missing Kernel File

Fix Boot Failure: Reinstall Kernel from Rescue Mode

Scenario 6: Root Filesystem Not Found – Diagnosis & Fix

Simulating the Failure: Modify Root Entry in Boot Configuration File

Reboot and Observe the Failure

Fix: Modify Root Entry from GRUB Prompt

Scenario 7: /etc/fstab Misconfiguration – Diagnosis & Fix

Scenario Overview

Simulating the Failure: Incorrect /etc/fstab Entry

Fix Boot Failure from Emergency Mode

Last lecture

Who this course is for:
Linux Administrators who want to improve troubleshooting skills
DevOps Engineers handling Linux-based production systems
Cloud Engineers working with Linux servers (AWS, Azure, GCP)
Students preparing for real-world Linux job roles
Anyone who wants to confidently fix Linux boot and recovery issues