dotfiles/modules/nixos/gaming/minecraft-server.nix

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{ config, pkgs, lib, ... }:
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let
localPort = 25564;
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publicPort = 49732;
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rconPort = 25575;
rconPassword = "thiscanbeanything";
in {
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config = lib.mkIf config.services.minecraft-server.enable {
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unfreePackages = [ "minecraft-server" ];
services.minecraft-server = {
enable = true;
eula = true;
declarative = true;
whitelist = { };
openFirewall = false;
serverProperties = {
server-port = localPort;
difficulty = "normal";
gamemode = "survival";
white-list = false;
enforce-whitelist = false;
level-name = "world";
motd = "Welcome!";
pvp = true;
player-idle-timeout = 30;
generate-structures = true;
max-players = 20;
snooper-enabled = false;
spawn-npcs = true;
spawn-animals = true;
spawn-monsters = true;
allow-nether = true;
allow-flight = false;
enable-rcon = true;
"rcon.port" = rconPort;
"rcon.password" = rconPassword;
};
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};
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networking.firewall.allowedTCPPorts = [ publicPort ];
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## Automatically start and stop Minecraft server based on player connections
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# Adapted shamelessly from:
# https://dataswamp.org/~solene/2022-08-20-on-demand-minecraft-with-systemd.html
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# Prevent Minecraft from starting by default
systemd.services.minecraft-server = { wantedBy = pkgs.lib.mkForce [ ]; };
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# Listen for connections on the public port, to trigger the actual
# listen-minecraft service.
systemd.sockets.listen-minecraft = {
wantedBy = [ "sockets.target" ];
requires = [ "network.target" ];
listenStreams = [ "${toString publicPort}" ];
};
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# Proxy traffic to local port, and trigger hook-minecraft
systemd.services.listen-minecraft = {
path = [ pkgs.systemd ];
requires = [ "hook-minecraft.service" "listen-minecraft.socket" ];
after = [ "hook-minecraft.service" "listen-minecraft.socket" ];
serviceConfig.ExecStart =
"${pkgs.systemd.out}/lib/systemd/systemd-socket-proxyd 127.0.0.1:${
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toString localPort
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}";
};
# Start Minecraft if required and wait for it to be available
# Then unlock the listen-minecraft.service
systemd.services.hook-minecraft = {
path = with pkgs; [ systemd libressl busybox ];
# Start Minecraft and the auto-shutdown timer
script = ''
systemctl start minecraft-server.service
systemctl start stop-minecraft.timer
'';
# Keep checking until the service is available
postStart = ''
for i in $(seq 60); do
if ${pkgs.libressl.nc}/bin/nc -z 127.0.0.1 ${
toString localPort
} > /dev/null ; then
exit 0
fi
${pkgs.busybox.out}/bin/sleep 1
done
exit 1
'';
};
# Run a player check on a schedule for auto-shutdown
systemd.timers.stop-minecraft = {
timerConfig = {
OnCalendar = "*-*-* *:*:0/20"; # Every 20 seconds
Unit = "stop-minecraft.service";
};
};
# If no players are connected, then stop services and prepare to resume again
systemd.services.stop-minecraft = {
serviceConfig.Type = "oneshot";
script = ''
# Check when service was launched
servicestartsec=$(
date -d \
"$(systemctl show \
--property=ActiveEnterTimestamp \
minecraft-server.service \
| cut -d= -f2)" \
+%s)
# Calculate elapsed time
serviceelapsedsec=$(( $(date +%s) - servicestartsec))
# Ignore if service just started
if [ $serviceelapsedsec -lt 180 ]
then
echo "Server was just started"
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exit 0
fi
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PLAYERS=$(
printf "list\n" \
| ${pkgs.rcon.out}/bin/rcon -m \
-H 127.0.0.1 -p ${builtins.toString rconPort} -P ${rconPassword} \
)
if echo "$PLAYERS" | grep "are 0 of a"
then
echo "Stopping server"
systemctl stop minecraft-server.service
systemctl stop hook-minecraft.service
systemctl stop stop-minecraft.timer
fi
'';
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};
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};
}