Linux Boot Process | Stage 2: GRUB & GRUB2 | Demo Ubuntu & CentOS | CompTIA Linux+ Prep

Hi guys! Mimz here and welcome back! Today's tech tutorial is on the Linux boot process, specifically a preparation for the CompTIA Linux+ exam.

This video is part 2 of 3 for the Linux boot process. If you missed part 1, please see the link below.
Video 1: Stage 1: BIOS and UEFI | CompTIA Linux+ Prep -    • Linux Boot Process | Stage 1: BIOS an...  

Today I will cover Stage 2: GRUB and GRUB2. I will cover what they are, the differences, and demonstrate where boot files are on Ubuntu and CentOS.

GRUB: Grand Unified Bootloader
GRUB: the way a computer transitions from BIOS or UEFI boot up conditions to the OS

GRUB:
Older and limited
Hard to modify the configuration files - /etc/default
Display boot menu at startup
Boot files: menu.lst or grub.conf

GRUB2:
Newer and most used
More customizable config files - /etc/default
Hidden boot menu at startup
More boot methods: ISO, USB, UUID, etc
Boot files: grub.cfg

Ubuntu Commands:
Boot folder: cd /boot/grub
GRUB Config file: cat /etc/default/grub
Make changes: sudo update-grub

CentOS
boot folder: cd /boot
GRUB Config File: cd /etc/default
Exit Vi: :q!

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