This LPIC-2 practice question tests your understanding of linux kernel and system startup. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A system administrator needs to include a custom kernel module in the initramfs to support a root filesystem on a USB device. Which command should be used to rebuild the initramfs with the updated kernel?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
dracut
dracut is the standard tool for creating initramfs images on many distributions.
update-initramfs
Why wrong: update-initramfs is Debian-specific and not general purpose.
mkinitrd
Why wrong: mkinitrd is an older tool and not the standard on modern systems; dracut is preferred.
grub-mkconfig
Why wrong: grub-mkconfig updates the GRUB configuration, not the initramfs.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
dracut
Dracut is the correct tool for rebuilding the initramfs on modern Red Hat-based distributions (e.g., RHEL, CentOS, Fedora). It automatically detects and includes kernel modules required for the root filesystem, including those for USB storage devices, and regenerates the initramfs image with the updated kernel module.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
dracut
Why this is correct
dracut is the standard tool for creating initramfs images on many distributions.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
update-initramfs
Why it's wrong here
update-initramfs is Debian-specific and not general purpose.
mkinitrd
Why it's wrong here
mkinitrd is an older tool and not the standard on modern systems; dracut is preferred.
grub-mkconfig
Why it's wrong here
grub-mkconfig updates the GRUB configuration, not the initramfs.
Common exam traps
The trap here is that candidates often confuse distribution-specific tools, assuming update-initramfs (Debian) or mkinitrd (legacy) are universally applicable, while the question implicitly targets a Red Hat-based environment where dracut is the standard.
Detailed technical explanation
Dracut uses a modular design with hooks and install scripts to assemble the initramfs. When a custom kernel module is added, dracut's '--add-drivers' option or a configuration file in /etc/dracut.conf.d/ can explicitly include it, ensuring the module is available during early boot before the root filesystem is mounted. This is critical for USB root devices, as the USB storage driver (e.g., usb-storage or uas) must be present in the initramfs to access the root partition.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the LPIC-2 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Linux Kernel and System Startup — This question tests Linux Kernel and System Startup — Read the scenario before looking for a memorised answer..
The correct answer is: dracut — Dracut is the correct tool for rebuilding the initramfs on modern Red Hat-based distributions (e.g., RHEL, CentOS, Fedora). It automatically detects and includes kernel modules required for the root filesystem, including those for USB storage devices, and regenerates the initramfs image with the updated kernel module.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This LPIC-2 practice question is part of Courseiva's free LPI certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LPIC-2 exam.
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