Technology Apr 20, 2026 · 1 min read

Show HN: Holos – QEMU/KVM with a compose-style YAML, GPUs and health checks

I got tired of libvirt XML and Vagrant's Ruby/reload dance for single-host VM stacks, so I built a compose-style runtime directly on QEMU/KVM.What's there: GPU passthrough as a first-class primitive (VFIO, OVMF, per-instance EFI vars), healthchecks that gate depends_on over SSH, socket-multicast L2...

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by zeroecco
Show HN: Holos – QEMU/KVM with a compose-style YAML, GPUs and health checks

I got tired of libvirt XML and Vagrant's Ruby/reload dance for single-host VM stacks, so I built a compose-style runtime directly on QEMU/KVM.

What's there: GPU passthrough as a first-class primitive (VFIO, OVMF, per-instance EFI vars), healthchecks that gate depends_on over SSH, socket-multicast L2 between VMs with no root and no bridge config, cloud-init wired through the YAML, Dockerfile support for provisioning.

What it's not: Kubernetes. No clustering, no live migration, no control plane. Single host. Prototype, but I'm running it on real hardware. Curious what breaks for people.

Comments URL: https://news.ycombinator.com/item?id=47840851

Points: 7

# Comments: 6

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This article was originally published by Hacker News and written by zeroecco.

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