Linux common boot issues and basic system recovery

By the end of the course you will:

Be able to familiar with common Linux boot problems and gets hands on experience on basic system recovery with various lab sessions.

Be able to confidently use the Linux operating system to increase your productivity and Career.

Be able to perform everyday computing tasks from the Linux command line.

Troubleshooting Linux Boot Problems (Basic System Recovery)

Introduction

Overview of the Course Module

Links to download RHEL, CentOS, VMWare Workstation or Oracle Virtual Box

Create Linux OS 8 Template using VMWare Workstation

Installation of Linux OS 8 using VMWare Workstation

Installation of Linux OS 8 using Oracle Virtual Box

Connect from putty

About RedHat Linux 8

Overview of Linux OS 8

Features of Linux OS 8

Controlling Services and Daemons

Introduction to Systemd, Systemd units

Lab on systemctl command and journal

Controlling the Boot Process

Booting Process of a RHEL 8 System

Selecting a systemd target, rebooting & shutting

Lab Exercise - Determine the default target and change the target into running system.

Lab - Selecting a rescue mode at boot time

Resetting a root password

Repairing Systemd Boot Issues

Booting RHEL 8 into Rescue Mode

Booting RHEL 8 into Emergency Mode

Enabling the Early Debug Shell

Repair a File System Issues at boot

Lab - Repair a File System

Troubleshooting Boot Problems based on RHEL7

initramfs file is missing

grub conf is missing

mbr is corrupted

fstab file missing or bad entry

Last Lecture

GRand Unified BootLoader (Grub2)

Overview of Grub

Grub Configuration file

Features of Grub2 and its comparison with Legacy Grub

Practical Lab Session - Different commands to run at Grub2 prompt

Practical Lab Session - Boot from Grub (Selecting Kernel & Initramfs)

Practical Lab Session - How to make your grub password protected