Boot Naked Linux
6 hours ago
- #Linux
- #Minimalism
- #Boot Process
- Recalling childhood computers that booted quickly, contrasting with modern systems that take minutes despite advanced hardware.
- Experimenting with stripping down Linux to its kernel and replacing the init process with a minimal custom program.
- Describing the boot process: initrd filesystem, initramfs, and how the kernel locates and runs the init program.
- Creating a custom initrd with a single compiled C program that prints a message and shuts down the system.
- Using QEMU/KVM for virtualization to test the minimal Linux setup without needing physical hardware.
- Modifying the init program to mount devtmpfs and read from a simulated disk device, demonstrating functionality.
- Instructions for booting on real hardware via USB: partitioning, formatting, and using ukify to create a unified EFI boot image.
- Building a tiny custom Linux kernel with minimal configuration to reduce size and boot time, improving security.
- Potential benefits include faster boot, reduced attack surface, and the ability to embed initrd directly into the kernel.