On a GRUB 2 system whose configuration file is /boot/grub/grub.cfg, type the grub-mkconfig command — including the option and its argument — that regenerates that file.
LPIC-1 Exam 101-500, objective 102. Linux installation and package management medium
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How these questions are written — where each question comes from, what the verification ledger records, and what happens when one is found wrong.
Answer
Type the answer.
Accepted answers
grub-mkconfig -o /boot/grub/grub.cfggrub-mkconfig --output=/boot/grub/grub.cfggrub-mkconfig --output /boot/grub/grub.cfg/usr/sbin/grub-mkconfig -o /boot/grub/grub.cfg
Case sensitive — Linux is, and grading LS as ls would teach a falsehood.
Why
grub-mkconfig writes the generated configuration to standard output unless you redirect it, so the -o (or --output=) option naming /boot/grub/grub.cfg is what actually updates the menu. Debian and Ubuntu ship update-grub as a one-word wrapper for exactly this command; Red Hat family systems using GRUB 2 name the binary grub2-mkconfig and the file /boot/grub2/grub.cfg.
Where this comes from
- Cited
- LPI exam objective 102.2
- What it says
- Regenerating the GRUB 2 configuration file after kernel or option changes.
Practise this
Reading one question is not practice. The trainer will draw a short set from objective 102 and space the ones you get wrong.
More questions on this objective
- A mail server keeps filling its root filesystem because spooled mail and logs grow without bound, and when the disk fills the whole system becomes unusable. Which single change to the disk layout most directly contains that failure? machine-checked
- In LVM terminology, which object is created directly on a partition or whole disk so that its storage can be added to a pool? machine-checked
- You are laying out storage for a general-purpose Linux server. Which TWO of the following are genuine reasons to use LVM for the data filesystems rather than plain partitions? machine-checked
- Which file is the configuration file that GRUB 2 generates, and which administrators are told not to edit by hand on a typical Linux distribution? machine-checked
- You replaced the boot disk in a BIOS/MBR system and need to write the GRUB 2 boot loader into the master boot record of /dev/sda, installing the required GRUB modules under /boot. Which command does that? machine-checked
- A GRUB menu entry ends with the directives 'set root=(hd0,3)' followed by 'chainloader +1'. What is GRUB doing? machine-checked