Arch Linux Initramfs Guide

Complete beginner-friendly guide to initramfs on Arch Linux, including configuration, regeneration, and troubleshooting.

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Table of Contents

1. Understanding Initramfs
2. Configuring Initramfs
3. Regenerating Initramfs
4. Troubleshooting

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Understanding Initramfs

What is Initramfs?

Initramfs is initial RAM filesystem loaded before root filesystem.

Purpose:

• Load kernel modules
• Mount root filesystem
• Start init system

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Configuring Initramfs

mkinitcpio Configuration

Edit config:

# Edit config
sudo vim /etc/mkinitcpio.conf

Common hooks:

HOOKS=(base udev autodetect modconf kms keyboard keymap consolefont block filesystems fsck)

Add Hooks

For encryption:

HOOKS=(base udev ... encrypt ... filesystems)

For LVM:

HOOKS=(base udev ... lvm2 ... filesystems)

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Regenerating Initramfs

Regenerate

Regenerate all:

# Regenerate for all kernels
sudo mkinitcpio -P

# For specific kernel
sudo mkinitcpio -p linux

After Changes

Regenerate after:

• Kernel updates
• Hook changes
• Module changes

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Troubleshooting

Boot Issues

Check initramfs:

# List images
ls -lh /boot/initramfs-*

# Check config
cat /etc/mkinitcpio.conf

Rebuild

Force rebuild:

# Force rebuild
sudo mkinitcpio -P -v

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Summary

This guide covered initramfs configuration, regeneration, and troubleshooting.

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Next Steps

• Arch Linux Kernel Management - Kernel
• Arch Linux Bootloader Configuration - Bootloader
• ArchWiki mkinitcpio: https://wiki.archlinux.org/title/Mkinitcpio

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This guide is based on the ArchWiki. For the most up-to-date information, always refer to the official ArchWiki.