Initrd Management

Question 1

What is initrd

Answer 1

Initial RAM disk - temporary filesystem used during boot to load drivers before mounting root

Question 2

What is initramfs

Answer 2

Initial RAM filesystem - modern replacement for initrd serving the same purpose

Question 3

Two main initrd management commands

Answer 3

mkinitrd and dracut

Question 4

Which initrd tool is considered legacy

Answer 4

mkinitrd

Question 5

Which initrd tool is the modern standard

Answer 5

dracut

Question 6

mkinitrd syntax

Answer 6

mkinitrd [options] <initrd-image> <kernel-version></kernel-version></initrd-image>

Question 7

dracut syntax

Answer 7

dracut [options] <initramfs-image> <kernel-version></kernel-version></initramfs-image>

Question 8

mkinitrd option to load module early

Answer 8

–preload=<module></module>

Question 9

mkinitrd option to add specific module

Answer 9

–with=<module></module>

Question 10

mkinitrd option to force image creation

Answer 10

-f

Question 11

mkinitrd option to disable compression

Answer 11

–nocompress

Question 12

dracut option to overwrite existing image

Answer 12

–force

Question 13

dracut option to add specific drivers

Answer 13

–add-drivers

Question 14

dracut option to exclude drivers

Answer 14

–omit-drivers

Question 15

dracut option to disable compression

Answer 15

–no-compress

Question 16

Key advantage of dracut

Answer 16

Dynamically includes only needed drivers and components

Question 17

Example mkinitrd command

Answer 17

mkinitrd –preload=ext4 –with=usb-storage -f –nocompress /boot/initrd-5.15.0.img 5.15.0

Question 18

Example dracut command

Answer 18

dracut –force –add-drivers “xfs nvme” –no-compress /boot/initramfs-5.15.0.img 5.15.0

Question 19

When initrd/initramfs is used

Answer 19

During boot process before mounting real root filesystem

Question 20

Purpose of initrd/initramfs

Answer 20

Load essential drivers and modules needed to access the root filesystem