Hey HN!

Rivet is an OSS game server management tool that enables game developers to easily deploy their dedicated servers without any infra experience.

We recently open-sourced Rivet after working on it for the past couple of years. I wanted to share some of my favorite things about our experience building this with the HN community.

My cofounder and I have been building multiplayer games together since middle school for fun (and not much profit [1]). In HS, I stumbled into building the entire infrastructure powering [Krunker.io](http://Krunker.io) (acq by FRVR) & other popular multiplayer web games. After wasting months rebuilding dedicated server infrastructure + DDoS/bot mitigation over and over, we started building Rivet as a side project.

Some interesting tidbits:

- ~99% Rust and a smidgeon of Lua.

- Bolt [2] – Cluster dev & management toolchain for super configurable self-hosted Rivet clusters. It’s way over-engineered.

- The entire repo is usable as a library. Our EE repo uses OSS as a submodule.

- Traefik used as an edge proxy for low-latency UDP, TCP+TLS, & WSS traffic.

- Apache Traffic Server is under-appreciated as a large file cache. Used as an edge Docker pull-through cache to improve cold starts & as a CDN cache to lower our S3 bill.

- ClickHouse used for analytics & game server logs. It’s so simple, I have nothing more to say.

- Serving Docker images with Apache TS is simpler & cheaper than running a Docker pull-through cache.

- Nebula has been rock solid & easy to operate as our overlay network.

- We use Redis Lua scripts for complex, atomic, in-memory operations.

- Obviously, we love Nix.

- We keep a rough SBOM [3].

- Licensed under Apache 2.0 (OSI-approved). We seriously want people to run & tinker with Rivet themselves. We get a lot of questions about this: [4] [5]

Some HN-flavored FAQ:

> Why not build on top of Agones or Kubernetes?

Nomad is simpler & more flexible than Agones/Kubernetes out of the box, which let us get up and running faster. For example, Nomad natively supports multiple task drivers, edge workloads, and runs as a standalone binary.

> [Fly.io](http://Fly.io) migrated off of Nomad, how will you scale?

Nomad can support 2M containers [6]. Some quick math: avg 8 players per lobby * 2M lobbies * 8 regional clusters = ~128M CCU. That’s well above PUBG’s 3.2m CCU peak.

Roblox’s game servers also run on top of Nomad [7]. We’re in good company.

> Are you affected by the recent Nomad BSL relicensing [8]?

Maybe, see [9].

> How do you compare to $X?

Our core goal is to get developers up and running as fast as possible. We provide extra services like our matchmaker [10], CDN [11], and KV [12] to make shipping a fully-fledged multiplayer game require only a couple of lines of code.

No other project provides a comparably accessible, OSS, and comprehensive game server manager.

> Do you handle networking logic?

No. We work with existing tools like FishNet, Mirror, NGO, Unreal & Godot replication, and anything else you can run in Docker.

> Is anyone actually using this?

Yes, we’ve been running in closed beta since Jan ‘22 and currently support millions of MAU across many titles.

[1]: https://github.com/rivet-gg/microgravity.io

[2]: https://github.com/rivet-gg/rivet/tree/main/docs/libraries/b...

[3]: https://github.com/rivet-gg/rivet/blob/main/docs/infrastruct...

[4]: https://github.com/rivet-gg/rivet/blob/main/docs/philosophy/...

[5]: https://github.com/rivet-gg/rivet/blob/main/docs/philosophy/...

[6]: https://www.hashicorp.com/c2m

[7]: https://www.hashicorp.com/case-studies/roblox

[8]: https://www.hashicorp.com/blog/hashicorp-adopts-business-sou...

[9]: https://news.ycombinator.com/item?id=37084825

[10]: https://rivet.gg/docs/matchmaker

[11]: https://rivet.gg/docs/cdn

[12]: https://rivet.gg/docs/kv

user:	singinwhale
created:	July 8, 2023
karma:	9