LPIC-2 Linux Kernel and System Startup Practice Question
After upgrading the kernel on a Red Hat Enterprise Linux system, the system fails to boot because the initramfs is missing. Which command can be used to regenerate the initramfs?
⚠ Common exam trap
Watch out — candidates often confuse the initramfs regeneration command with the bootloader configuration update command (`grub2-mkconfig`), or they mistakenly apply a Debian/Ubuntu command (`mkinitramfs`) to a RHEL system, not realizing that `dracut` is the correct tool for Red Hat-based distributions.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
dracut -f
On Red Hat Enterprise Linux (RHEL) systems, the `dracut` utility is the standard tool for creating and regenerating initial RAM filesystem images (initramfs). The `-f` (force) option overwrites an existing initramfs file, which is necessary after a kernel upgrade to ensure the new kernel has the correct drivers and modules to mount the root filesystem during boot. Without a valid initramfs, the kernel cannot access the root filesystem, causing a boot failure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
dracut -f
Why this is correct
dracut -f regenerates the initramfs image.
- ✗
mkinitrd -f
Why it's wrong here
mkinitrd is an older tool that may not be available; dracut is the modern standard.
- ✗
grub2-mkconfig -o /boot/grub2/grub.cfg
Why it's wrong here
This updates the GRUB configuration, not the initramfs.
- ✗
mkinitramfs -o /boot/initrd.img
Why it's wrong here
mkinitramfs is used on Debian/Ubuntu, not typically on RHEL.
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