srcds-nix

Warning

WORK IN PROGRESS - The module does not have a stable interface. If you use this then you should recognize that options could change in totally breaking ways up until I decide that it's stable.

Manage and run Source Dedicated Server games on NixOS.

Unlike other projects like nix-garrys-mod, this module does not attempt to download and store the dedicated server software as a Nix derivation. Instead, it generates systemd units that download the software with steamcmd at launch, then applies configurations to files like server.cfg. The upsides mean this the module can easily support more games, and automatically use the latest updates, but the downside is the server is a little less reproducible.

Games

Warning

Source 2 games don't work yet. Don't try to run Counter-Strike 2 with this module until it's finished.

Game	AppID	Game Folder
Left 4 Dead	222840	left4dead
Left 4 Dead 2	222860	left4dead2
Team Fortress 2	232250	tf
Day of Defeat: Source	232290	dod
Counter-Strike: Source	232330	cstrike
Half-Life 2: Deathmatch	232370	hl2mp
Source SDK Base 2013	244310	(undefined)
Half-Life Deathmatch: Source	255470	hl1mp
Black Mesa	346680	bms
Garry's Mod	4020	garrysmod
Counter-Strike 2	730	game/csgo
Counter-Strike: Global Offensive	740	csgo

Install

Flake

Add this repo to your flake inputs:

srcds-nix.url = "github:ihaveamac/srcds.nix";

Add srcds-nix to the outputs arguments.

Add to modules of the NixOS system:

modules = [
  srcds-nix.nixosModules.default
];

Example

This will set up a server for Counter-Strike: Source, enable RCON, and configure it. Server files will be stored at /var/lib/srcds/my-css-server.

services.srcds = {
  enable = true;
  openFirewall = true;
  games = {
    my-css-server = {
      appId = 232330;
      gamePort = 27015;
      rcon = {
        enable = true;
        password = "secretpass";
      };
      config = {
        hostname = "My CSS server on NixOS!";
        sv_password = "entrypass";
        sv_contact = "you@example.com";
      };
    };
  };
};

Module options

Please see the module options list.

Probably FAQ

What is the point of curl-symbol-downgrade.patch?

The Team Fortress 2 replay library (specifically replay_srv.so) wants to use libcurl with GnuTLS, but it wants some symbol version 3, while curlWithGnuTls has version 4. If it isn't, it gets upset and I think the server will not start.

failed to dlopen /tf2server/bin/replay_srv.so error=/lib32/libcurl-gnutls.so.4: version `CURL_GNUTLS_3' not found (required by /tf2server/bin/replay_srv.so)
failed to dlopen /tf2server/bin/replay_srv.so error=/lib32/libcurl-gnutls.so.4: version `CURL_GNUTLS_3' not found (required by /tf2server/bin/replay_srv.so)
failed to dlopen replay_srv.so error=/lib32/libcurl-gnutls.so.4: version `CURL_GNUTLS_3' not found (required by bin/replay_srv.so)

So, inspired by this patch in the Arch User Repository, I have curl patched to downgrade this version. (Also, the software must be run through the Steam Runtime for it to actually work.)

To be honest I don't understand how any of this works. But it does work, and TF2 is happy.

This is not actually required for any other srcds games as far as I know.