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autostart and stop minecraft server
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e2af159c26
commit
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@ -1,4 +1,13 @@
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{ ... }: {
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{ pkgs, ... }:
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let
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localPort = 25564;
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publicPort = 25565;
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rconPort = 25575;
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rconPassword = "thiscanbeanything";
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in {
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unfreePackages = [ "minecraft-server" ];
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@ -7,9 +16,9 @@
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eula = true;
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declarative = true;
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whitelist = { };
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openFirewall = true;
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openFirewall = false;
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serverProperties = {
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server-port = 25565;
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server-port = localPort;
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difficulty = "normal";
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gamemode = "survival";
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white-list = false;
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@ -26,7 +35,112 @@
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spawn-monsters = true;
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allow-nether = true;
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allow-flight = false;
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enable-rcon = true;
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"rcon.port" = rconPort;
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"rcon.password" = rconPassword;
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};
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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:
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# https://dataswamp.org/~solene/2022-08-20-on-demand-minecraft-with-systemd.html
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# Prevent Minecraft from starting by default
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systemd.services.minecraft-server = { wantedBy = pkgs.lib.mkForce [ ]; };
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# Listen for connections on the public port, to trigger the actual
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# listen-minecraft service.
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systemd.sockets.listen-minecraft = {
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wantedBy = [ "sockets.target" ];
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requires = [ "network.target" ];
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listenStreams = [ "${toString publicPort}" ];
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};
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# Proxy traffic to local port, and trigger hook-minecraft
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systemd.services.listen-minecraft = {
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path = [ pkgs.systemd ];
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requires = [ "hook-minecraft.service" "listen-minecraft.socket" ];
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after = [ "hook-minecraft.service" "listen-minecraft.socket" ];
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serviceConfig.ExecStart =
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"${pkgs.systemd.out}/lib/systemd/systemd-socket-proxyd 127.0.0.1:${
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toString localPort
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}";
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};
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# Start Minecraft if required and wait for it to be available
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# Then unlock the listen-minecraft.service
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systemd.services.hook-minecraft = {
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path = with pkgs; [ systemd libressl busybox ];
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# Start Minecraft and the auto-shutdown timer
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script = ''
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systemctl start minecraft-server.service
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systemctl start stop-minecraft.timer
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'';
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# Keep checking until the service is available
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postStart = ''
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for i in $(seq 60); do
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if ${pkgs.libressl.nc}/bin/nc -z 127.0.0.1 ${
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toString localPort
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} > /dev/null ; then
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exit 0
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fi
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${pkgs.busybox.out}/bin/sleep 1
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done
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exit 1
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'';
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};
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# Run a player check on a schedule for auto-shutdown
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systemd.timers.stop-minecraft = {
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timerConfig = {
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OnCalendar = "*-*-* *:*:0/20"; # Every 20 seconds
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Unit = "stop-minecraft.service";
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};
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wantedBy = [ "timers.target" ];
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};
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# If no players are connected, then stop services and prepare to resume again
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systemd.services.stop-minecraft = {
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serviceConfig.Type = "oneshot";
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script = ''
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# Check when service was launched
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servicestartsec=$(
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date -d \
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"$(systemctl show \
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--property=ActiveEnterTimestamp \
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minecraft-server.service \
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| cut -d= -f2)" \
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+%s)
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# Calculate elapsed time
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serviceelapsedsec=$(( $(date +%s) - servicestartsec))
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# Ignore if service just started
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if [ $serviceelapsedsec -lt 180 ]
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then
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echo "Server was just started"
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exit 0
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fi
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PLAYERS=$(
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printf "list\n" \
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| ${pkgs.rcon.out}/bin/rcon -m \
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-H 127.0.0.1 -p ${builtins.toString rconPort} -P ${rconPassword} \
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)
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if echo "$PLAYERS" | grep "are 0 of a"
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then
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echo "Stopping server"
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systemctl stop minecraft-server.service
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systemctl stop hook-minecraft.service
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systemctl stop stop-minecraft.timer
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fi
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'';
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};
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}
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