102.2 Install a Boot Manager

Question 1

What is GRUB

Answer 1

Grand Unified Boot Loader

Bios –> boot.img (Stage 1) –> core.img (Stage 1.5) –> boot/grub (Stage 2) –> Booted

Question 2

How do you invoke the grub shell?

Answer 2

You use the grub command.

Question 3

What is the difference Between MBR and GPT

Answer 3

MBR: Only supports 2TB and 26 total partitions

GPT (GUID Partition Table)

• Supports 128 partitions
• Partition size up in the zettabyte range
• Needs UEFI (Unified Extensible Firmare Interface) to boot
  
  • Replacement for traditional BIOS, can act in legacy BIOS mode

Question 4

What is the boot process for GPT

Answer 4

Stage 1&raquo_space; MBR –> GPT header –> Partition Entry Array
Stage 1.5&raquo_space; Typically Empty Sectors –> ESP
Stage 2&raquo_space; Boot/grub2

Question 5

How do you view the default boot entry for the grub configuration file?

Answer 5

grub2-editenv list

Question 6

How do you create or update the grub.cfg file based on entries from the /etc/default/grub file.

Answer 6

grub2-mkconfig

Question 7

Where is the default grub2 config file stored?

Answer 7

/etc/default/grub

Question 8

How do you open up grub command line at boot.

Answer 8

Press the a key and then c key to bring up the grub cli.

Question 9

How do you view which hard drives are being seen by grub from the grub cli.

Answer 9

ls