202.2 - System Recovery

Weight: 4

Description: Candidates should be able to properly manipulate a Linux system during both the boot process and during recovery mode. This objective includes using both the init utility and init-related kernel options. Candidates should be able to determine the cause of errors in loading and usage of bootloaders. GRUB version 2 and GRUB Legacy are the bootloaders of interest. Both BIOS and UEFI systems are covered.

Key Knowledge Areas:

BIOS and UEFI

NVMe booting

GRUB version 2 and Legacy

grub shell

boot loader start and hand off to kernel

kernel loading

hardware initialisation and setup

daemon/service initialisation and setup

Know the different boot loader install locations on a hard disk or removable device.

Overwrite standard boot loader options and using boot loader shells.

Use systemd rescue and emergency modes.

Terms and Utilities:

mount

fsck

inittab, telinit and init with SysV init

The contents of /boot/, /boot/grub/ and /boot/efi/

EFI System Partition (ESP)

GRUB

grub-install

efibootmgr

UEFI shell

initrd, initramfs

Master boot record

systemctl