DedicatedServerConfig.json: tuning your Foundry server
Par Benjamin Dayan · PDG
· Lecture 6 min
Contents
The entire behavior of a dedicated Foundry server lives in a single text file: DedicatedServerConfig.json, written automatically on first launch. Knowing it means avoiding needless restarts and worlds created by mistake. Let's go over the settings that genuinely weigh on a smooth co-op session.
The config file's skeleton
- World name: it serves as the display name and the save folder name. Changing it later doesn't rename your world, it starts a blank one, so set it from the outset.
- Password: the gate of a private server. Only leave it empty if you fully accept a factory open to anyone.
- Slots: the cap on simultaneous players. Foundry is usually played at 4-8; align this figure with your RAM and your CPU's clock speed.
- Auto-save: set a regular interval. A crash with no backup means an entire factory wiped off the map.
- UDP port: to carry over into the port forwarding rule if you're self-hosting.
RAM, the lifeblood of the factory simulation
Foundry doesn't just store a map: it simulates conveyors, machines and ore flows in real time. Every new building adds memory load. Too tight an allocation shows up as micro-stutters on the server side as soon as the base spreads out. To gauge the tiers by your factory's size, see our article on the price of a Foundry server.
Three moves that stabilize the server
- Keep the server up to date: Foundry patches regularly optimize the simulation engine.
- Space out backups sensibly so you don't freeze the game every cycle.
- Bet on per-core clock speed rather than core count, a detail expanded on in our comparison of Foundry hosts.
A reflex to burn in: any change to DedicatedServerConfig.json only takes effect after a full server restart.
The no-text-editor version
On a Foundry server hosted by Fly-Serv, FlyPanel edits DedicatedServerConfig.json from a readable interface: you change the password or the slots, back up in one click (Backup add-on) and restart the server with one button to apply everything, without ever opening SteamCMD. Compare the Foundry hosting plans starting at 3,99 €/month.
Read next
- Joining a Foundry co-op game: connection and bugsDirect connection by IP and port, entering the password, version mismatch: the how-to for getting into a Foundry factory without the hassle.
- Creating a Foundry server: the 2 methods that workSteamCMD on your own machine or a turnkey host: we walk through both paths to launch your Foundry co-op factory, with their real-world pitfalls.
- Configurer un serveur Arma Reforger depuis zéroA full walkthrough of the Arma Reforger config.json file: scenario ID, player slots, mission header, mods array and game properties explained line by line.