I Built a Serverless VPN on Lambda MicroVMs — 12 Builds, 5 Dead Ends, 1 Working Architecture
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Detailed serverless VPN using Lambda MicroVMs, actionable architecture.
Summary
AWS Lambda MicroVMs (Firecracker) lack TUN and WireGuard kernel modules, forcing a workaround using veth pairs and a SOCKS5 proxy (microsocks) over a wstunnel WebSocket tunnel. The final architecture launches in ~20 seconds, costs ~$0.13/hr for 2GB ARM64, and terminates on disconnect for zero ongoing cost. Twelve image builds and five dead ends—including NAT gateway replacement and Boringtun attempts—preceded this working solution.