Posts
Guides, benchmarks, and updates from Celesto.
Petabyte-scale storage for AI agent sandboxes
CelestoFS gives AI agent sandboxes a durable petabyte-scale workspace filesystem for repositories, build artifacts, datasets, and workspace state.
How qcow2 Overlays Work in QEMU
Learn how qcow2 backing files work in QEMU, why they are different from Linux overlayfs, and how they make VM sandbox cloning fast and cheap.
Open Source Windows Sandbox in Python: Run Windows 11 on Linux with Celesto
Celesto now supports Windows 11 sandboxes. Boot disposable Windows VMs from Python, run PowerShell, upload files, pass environment variables, and tear the VM down after the task.
How to Safely Run AI-Generated Code with Celesto (Open-Source MicroVM Sandbox)
Celesto is an open-source microVM runtime that lets AI agents run untrusted code in a hardware-isolated sandbox. Learn why Docker isn't enough for LLM-generated code and how to spin up a Firecracker-powered sandbox in three lines of Python.