Building Multiplayer Game Servers with AWS Lambda MicroVMs

A multiplayer game server that spins up when a player joins, holds state the entire session, suspends when idle (billing stops), and resumes in under a second. One VM per room, zero servers to manage, built on Lambda MicroVMs. Lambda MicroVMs are a new compute primitive in the Lambda family. Same Firecracker isolation that already runs billions of Lambda invocations, but a different shape: stateful, long-running (up to 8 hours), session-oriented, with suspend/resume and per-second billing. I built Faceteroids (asteroids but you shoot my face) to show how the whole thing works. One microVM per game room, WebSocket connections, server-authoritative physics, and compute billing that stops the instant a room goes idle. Read the Blog: https://go.aws/4goEwZZ Github Repo: https://go.aws/4gga8Ro Lambda MicroVMs Docs: https://go.aws/4g4jrFf Follow AWS Developers! 🆇 X: https://go.aws/4glsbWv 💼 LinkedIn: https://go.aws/4zqVcIW 0:00 Building a Multiplayer Game Server on Lambda 1:59 Lambda Functions vs Lambda MicroVMs (Side-by-Side) 3:05 Faceteroids: The Architecture 4:08 Three Layers: Control Plane, Frontend, Game Server 6:08 MicroVM Lifecycle: Image to Termination 11:07 Ready Hook & Validate Hook 12:21 The Snapshot Trap (RNG Seed Bug) 14:10 3 Rules When Planning Snapshots 19:11 Browser WebSocket Auth (Sub-Protocol Trick) 21:02 Pricing: Per-Second Billing & Burst Scaling 24:51 Beyond Games: Other Use Cases #AWS #LambdaMicroVM #Serverless