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No more boot loader: Please use the kernel instead DevConf.CZ
pretalx.comWe are working on a new scheme to replace the GRUB bootloader with a fast, secure, Linux-based, user-space solution: nmbl (for no more boot loader).
Most people are familiar with GRUB, a powerful, flexible, fully-featured bootloader that is used on multiple architectures (x86_64, aarch64, ppc64le OpenFirmware). Although GRUB is quite versatile and capable, its features create complexity that is difficult to maintain, and that both duplicate and lag behind the Linux kernel while also creating numerous security holes. On the other hand, the Linux kernel, which has a large developer base, benefits from fast feature development, quick responses to vulnerabilities and greater overall scrutiny.
We (Red Hat boot loader engineering) will present our solution to this problem, which is to use the Linux kernel as its own bootloader. Loaded by the EFI stub on UEFI, and packed into a unified kernel image (UKI), the kernel, initramfs, and kernel command line, contain everything they need to reach the final boot target. All necessary drivers, filesystem support, and networking are already built in and code duplication is avoided.
We will showcase the work done so far, and ask you for your feedback and use cases.
I’m not convinced that this is actually simpler. I’m also confused because Red Hat already was trying to simplify booting with systemd-boot. Are they no longer happy with their existing approach?
Speaking of systemd boot, I tried it on a recent install, and my system only booted properly about 20% of the time. I switched back to grub, and it’s been rock solid since.
I’d be curious what the issue was.
I’ve used grub for years but am curious about systemd-boot as it’s supposed to be far simpler/easier.