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Dev tools · April 19, 2026

CA

Clone, a small Rust VMM, forks VMs in under 20ms via CoW

We needed a secure, multi-tenant way to offer shell accounts to users, but most VMMs were using too much memory and containers are unsafe. With clone, VMs are now more memory efficient than containers in most cases. Since many other projects on HN looked like they were doing this too, open sourcing this was the right thing to do. Feel free to use in whole or in part as you see fit!

In plain words

Clone is a lightweight virtual machine monitor written in Rust that creates new VMs in under 20 milliseconds using copy-on-write technology. It addresses the need for secure, multi-tenant shell account hosting by offering memory efficiency that typically exceeds container solutions while maintaining VM-level security isolation. The tool is designed for developers and service providers who require fast VM instantiation without the memory overhead of traditional hypervisors.

written from the facts on this page · September 2026

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