Linux Boot Failure And Recovery Labs: Centos 10 / Rhel 10
 

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.
Requirements
Basic understanding of Linux commands (ls, cd, vi, etc.)
Familiarity with Linux file system structure is helpful
A system with Oracle VirtualBox installed
Ability to download and run CentOS 10 / RHEL 10 ISO
Description
Linux Boot Failure & Recovery Labs: CentOS 10 / RHEL 10Struggling 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 GuideAn Overview of This SectionDownload and Install VirtualBoxDownload CentOS 10 ISOCreate a New Virtual MachineConfigure the Virtual MachineConfigure Virtual HardwareHard Disk File Type and FormatUncheck - Proceed with Unattended InstallationBegin the InstallationConfigure Installation SummaryLog in to the CentOS Desktop EnvironmentAccess Linux VM from Windows using MobaXtermLogin Issue TroubleshootingSection 2: Understanding the Linux Filesystem HierarchyWhat You Will Learn in This SectionLinux Filesystem ExplainedUnderstanding Disk-Based FilesystemsMemory-Based (tmpfs) FilesystemUnderstanding the Root ( / ) Filesystem in LinuxUnderstanding devtmpfs Filesystem in LinuxUnderstanding tmpfs Shared Memory Filesystem in LinuxUnderstanding tmpfs Mounted on /runtmpfs Filesystem for systemd-journald ServiceUnderstanding the /boot Filesystem in LinuxUnderstanding /run/user tmpfs FilesystemSection 3: Linux Boot Process (CentOS 10 / RHEL 10)Section 4: Rescue and Emergency Mode in LinuxLinux Emergency Mode: Overview and Use CasesSteps to Boot into Emergency Mode in LinuxLab: Boot into Emergency Mode and Fix IssuesLinux Rescue Mode: Overview and Use CasesSteps to Boot into Rescue Mode in LinuxLab: Boot into Emergency Mode via GRUB (Edit Method)Lab: Boot into Emergency Mode Using CentOS ISO ImageScenario 1: Initramfs File Missing - Diagnosis & FixScenario OverviewSimulating the Failure: Missing InitramfsRecreate Initramfs from Rescue ModeScenario 2: GRUB Configuration File Missing - Diagnosis & FixScenario OverviewSimulating the Failure: Missing GRUB Configuration FileManual Boot from GRUB PromptRecreating GRUB Configuration Using grub2-mkconfigScenario 3: BIOS Boot Partition Corrupted - Diagnosis & FixUnderstanding the BIOS Boot PartitionIdentify BIOS Boot PartitionCorrupt BIOS Boot Partition Using dd (Simulate Failure)Fix Boot Failure: Reinstall GRUB from Rescue ModeScenario 4: Missing Critical Binary (/bin/mount) - Diagnosis & FixScenario OverviewSimulating the Failure: Missing /bin/mount BinaryRecover /bin/mount via Package Reinstall (Rescue Mode)Scenario 5: Kernel Missing/Corrupted - Diagnosis & FixSimulating the Failure: Missing Kernel FileFix Boot Failure: Reinstall Kernel from Rescue ModeScenario 6: Root Filesystem Not Found - Diagnosis & FixSimulating the Failure: Modify Root Entry in Boot Configuration FileReboot and Observe the FailureFix: Modify Root Entry from GRUB PromptScenario 7: /etc/fstab Misconfiguration - Diagnosis & FixScenario OverviewSimulating the Failure: Incorrect /etc/fstab EntryFix Boot Failure from Emergency ModeLast lecture
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