Environment file as defined in systemd.exec(5). Secrets may be passed to the service without adding them to the world-readable Nix store, by specifying placeholder variables as the option value in Nix and setting these variables accordingly in the environment file. # snippet of teeworlds-related config services.teeworlds.password = "$TEEWORLDS_PASSWORD"; # content of the environment file TEEWORLDS_PASSWORD=verysecretpassword Note that this file needs to be available on the host on which teeworlds is running.

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"/var/lib/teeworlds/teeworlds.env"