ianseyler

Potentially! It really depends on building it to run on BareMetal.

Can you try it again? I see some valid logins via Google.

None yet - this is a beta so bandwidth pricing will come later.

I’m glad you remember it! I’ve been plugging away at it for quite some time now.

The kernel is mainly the same - just modifications for running under Firecracker.

We built BareMetal OS - a minimal exokernel with sub-millisecond cold boot and hardware level microVM isolation. We think it's small (VMs can use as little as 4MiB of RAM) and fast enough to be genuinely interesting to build on. So we're running a 2-week challenge to find out what you can build. See link for contest details and rules. Complimentary cloud credits for every applicant to help you build on our servers. Grand prize winner announced Sep 24, 2026.

I’d be interested in attempting to run this in a network- enabled 32MiB RAM microVM.

BareMetal is an x86-64 exokernel written entirely in hand-coded Assembly. This repo adapts it to run natively inside Firecracker microVMs. No BIOS, no UEFI, no PCI bus - just virtio-net and virtio-block over MMIO.

~800µs cold start in Firecracker on an AMD Ryzen AI Max+ 395. ~600µs with only networking.

Each microVM can be provisioned with as little as 2MiB of RAM. The kernel binary itself is ~5.5KB - the rest of the kernel image is layout padding to place the monitor and application payloads at fixed memory addresses.

A simple web server with some static content to server.

Can we get smaller VM hosts? I’ve seen some minimums at 512MB for a host. I need 8MB at most sometimes.

Update: Fourplex (this host) uses a 1GB minimum.