Distribution kernels are designed to run everywhere, from a Linux distribution on an old laptop to a current production machine. That universal approach includes drivers, filesystems and subsystems you may never use, making the kernel larger, more complex and broadening its attack surface. Compiling a minimal kernel tailored to your hardware can reduce that complexity and improve stability, security and performance on a high-performance server.
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What is a minimal kernel?
A minimal Linux kernel is recompiled with only the parts needed by the target machine. It includes only drivers for the hardware actually present—network card, storage controller, processor and so on—and the filesystems in use, such as ext4, xfs or btrfs. Unused modules, drivers and irrelevant subsystems are disabled.
Consumer and server distributions ship a universal kernel that can boot on almost any hardware, with thousands of drivers and options. A custom kernel targets one defined environment, so it is lighter, more compact and more predictable. It can be useful on a dedicated server, a high-throughput routing or filtering appliance, or a specialised virtual machine whose devices are known in advance.
Compile a custom Linux kernel on Arch Linux
First install the tools required for compilation:
sudo pacman -S --needed base-devel git bc cpio ncurses libelf pahole llvm clang
Download the official source from Linus Torvalds’ Git repository:
git clone https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Reuse the configuration of the kernel already running on the system as a stable, hardware-suitable starting point:
cd linux zcat /proc/config.gz > .config 2>/dev/null || cp /usr/lib/modules/$(uname -r)/build/.config .config
Update configuration options for the source version you downloaded:
make olddefconfig
Keep only drivers currently used by this machine. The resulting kernel is lighter but will not work on a different machine:
make localmodconfig
Compile using all available CPU cores:
make -j"$(nproc)"
Install modules:
sudo make modules_install
Install the kernel:
sudo make install
To avoid confusion with the distribution kernel, rename the compiled binary:
sudo cp /boot/vmlinuz /boot/vmlinuz-archeasy
Create an mkinitcpio preset to generate initramfs images for the custom kernel:
sudo tee /etc/mkinitcpio.d/archeasy.preset >/dev/null <<'EOF'
ALL_config="/etc/mkinitcpio.conf"
ALL_kver="/boot/vmlinuz-archeasy"
PRESETS=('default' 'fallback')
default_image="/boot/initramfs-archeasy.img"
default_options="-S autodetect"
fallback_image="/boot/initramfs-archeasy-fallback.img"
fallback_options=""
EOF
Generate the matching initramfs images:
sudo mkinitcpio -p archeasy
Regenerate the GRUB configuration so that the new kernel is recognised at startup:
sudo grub-mkconfig -o /boot/grub/grub.cfg
After restarting, open Advanced options in GRUB. Your compiled kernel appears as Arch Linux, with Linux archeasy. You can test it while keeping the generic kernel as a fallback.
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Why compile a minimal kernel?
Compiling a minimal Arch Linux kernel is not just a technical exercise: it gives you more control over the system. Removing unnecessary components can make startup faster, behaviour more predictable and the system safer because less code means fewer potential vulnerabilities.
This optimisation suits demanding environments such as high-performance servers, network appliances and sensitive deployments, where lightness and reliability matter more than versatility. The principle is simple: less code means fewer bugs and therefore fewer vulnerabilities.
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