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Comment by alexellisuk

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Comment by alexellisuk

This is clever work, especially given that Proxmox is already a very viable VMware replacement and wasn’t originally designed around microVMs as the primary abstraction. I’m glad this is working well for you.

We’ve been on a similar journey, but came at it from the opposite direction. We started SlicerVM in 2022 after seeing how slow Multipass felt when launching more than one Linux VM, even though it is relatively lean. Tearing them down was slower.. we made it seconds either way for a 30 node cluster and kept it internal until August last year.

With Slicer, microVMs are the native primitive: API launch, guest-agent exec/shell/cp/forward workflows, isolated networking, and agent sandboxes are built into the control plane.

That was not our first use case. Back then we were standing up Kubernetes clusters quickly for OpenFaaS e2e testing and customer scale-out support across multiple machines. The agent/sandbox workflows came naturally after that.

We do see people come over from Proxmox when they want something more directly driven from code, especially with a deeper guest-agent model: exec, file copy, port forwarding, fs watches, etc. When you string it all together it becomes very powerful and what we've gradually dogfooded for our code review bot that started out by using SSH/SFTP to completely native SDK (Go/TS).

One thing I’d separate in the benchmarks is in-guest boot time vs. actual time-to-interactive/useful. For agent-style workloads, the number that tends to matter is: API request made -> VM created/cloned -> network policy applied -> guest agent reachable -> exec/shell/cp/forward works. Snapshot cloning, network device setup, and control-plane readiness all show up there.

TTI can also be moved around depending on tradeoffs: no real init system, snapshot resume, CrosVM-style lower-level primitives, or a VMM built for one narrow job. We use systemd in the guest, so we’re intentionally carrying some weight there.

I also liked that you retained module support for Docker. Supporting Docker, Kubernetes-ish workloads, and eBPF tends to add a lot of useful weight back in.

There’s room for several tools here. The space is moving quickly, and I’m looking forward to seeing which approaches consolidate.

If folks are looking to scratch that microVM, or programmable / bash / agent / SDK driven primitive, you're welcome to check us out and join the Discord.

Replies alexellisuk · 2026-06-21
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