LFCS Certification LFCS Boot Process and System Initialization 1

Question 1

What file contains the GRUB 2 configuration used at boot time on most Linux systems?

Accepted Answer

/boot/grub2/grub.cfg

Answer

GRUB 2 reads /boot/grub2/grub.cfg at boot; this file is auto-generated and should not be edited directly.

Question 2

Which command regenerates the GRUB 2 configuration file on RHEL/CentOS-based systems?

Accepted Answer

grub2-mkconfig

Answer

grub2-mkconfig reads /etc/default/grub and scripts in /etc/grub.d/ to produce a new grub.cfg.

Question 3

Which file stores default GRUB 2 settings such as timeout and GRUB_CMDLINE_LINUX?

Accepted Answer

/etc/default/grub

Answer

/etc/default/grub is the human-editable file where you set timeout, default entry, and kernel parameters.

Question 4

Which kernel parameter passed at the GRUB boot line boots the system into rescue mode?

Accepted Answer

systemd.unit=rescue.target

Answer

Appending systemd.unit=rescue.target tells systemd to bring up only the rescue target instead of the default.

Question 5

What command installs the GRUB 2 bootloader to the MBR of the disk /dev/sda?

Accepted Answer

grub2-install /dev/sda

Answer

grub2-install writes the GRUB stage 1 code to the MBR of the specified disk device, not a partition.

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