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Set up Garry's Mod server on Debian 12 with SteamCMD

Elias Bieber9 March 2026

Estimated reading time: 1 min

Install a GMod server via SteamCMD: set force_install_dir, app_update 4020, write start script with srcds_run and optionally run in background with screen.

Garry's ModGModSteamCMDLinuxDebian

GMod server with SteamCMD

Requirement: SteamCMD installed. In SteamCMD:

force_install_dir /root/gmod/

login anonymous

app_update 4020 validate

Create start script run.sh (nano), e.g.:

./srcds_run -game garrysmod -maxplayers 16 +gamemode sandbox +map gm_flatgrass

chmod u+x run.sh && bash run.sh

Optional: screen -S gmod for background. In GMod: connect IP:27015

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