tlaternet-server/etc/nixos/services/minecraft.nix

{ pkgs, ... }:

let
  ops = pkgs.writeText "ops.json" (builtins.toJSON [
    {
      uuid = "140d177a-966f-41b8-a4c0-e305babd291b";
      name = "TLATER";
      level = 4;
      bypassesPlayerLimit = true;
    }
  ]);
  whitelist = pkgs.writeText "whitelist.json" (builtins.toJSON [
    {
      uuid = "59cd1648-14a4-4bcf-8f5a-2e1bde678f2c";
      name = "romino25";
    }
    {
      uuid = "0ab6e3d1-544a-47e7-8538-2e6c248e49a4";
      name = "lasi25";
    }
    {
      uuid = "140d177a-966f-41b8-a4c0-e305babd291b";
      name = "TLATER";
    }
  ]);
  properties = pkgs.writeText "server.properties" ''
    #Minecraft server properties
    #Sun Jul 19 16:04:54 GMT 2020
    max-tick-time=60000
    generator-settings=
    allow-nether=true
    force-gamemode=false
    gamemode=0
    enable-query=false
    player-idle-timeout=0
    difficulty=1
    spawn-monsters=true
    op-permission-level=4
    pvp=false
    snooper-enabled=true
    level-type=DEFAULT
    hardcore=false
    enable-command-block=false
    max-players=4
    network-compression-threshold=256
    resource-pack-sha1=
    max-world-size=29999984
    server-port=25565
    server-ip=
    spawn-npcs=true
    allow-flight=true
    level-name=world
    view-distance=15
    resource-pack=
    spawn-animals=true
    white-list=true
    generate-structures=true
    online-mode=true
    max-build-height=256
    level-seed=
    prevent-proxy-connections=false
    use-native-transport=true
    motd=Adventures met die broers
    enable-rcon=false
  '';

in
{
  docker-containers = {
    minecraft = {
      image = "tlaternet/minecraft";
      imageFile = pkgs.dockerTools.buildImage {
        name = "tlaternet/minecraft";
        tag = "latest";
        runAsRoot = ''
          mkdir -p /var/lib/
          ${pkgs.gzip}/bin/gzip -dc ${./configs/minecraft.tar.gz} | ${pkgs.gnutar}/bin/tar -xf - -C /var/lib
          echo 'eula=true' > /var/lib/minecraft/eula.txt
          cp -f ${properties} /var/lib/minecraft
        '';
        config = {
          Cmd = [ "${pkgs.jre_headless}/bin/java"
                  "-Xms2G"
                  "-Xmx2G"
                  # Using recommended flags from https://mcflags.emc.gs
                  "-XX:+UseG1GC"
                  "-XX:+ParallelRefProcEnabled"
                  "-XX:MaxGCPauseMillis=200"
                  "-XX:+UnlockExperimentalVMOptions"
                  "-XX:+DisableExplicitGC"
                  "-XX:+AlwaysPreTouch"
                  "-XX:G1NewSizePercent=30"
                  "-XX:G1MaxNewSizePercent=40"
                  "-XX:G1HeapRegionSize=8M"
                  "-XX:G1ReservePercent=20"
                  "-XX:G1HeapWastePercent=5"
                  "-XX:G1MixedGCCountTarget=4"
                  "-XX:InitiatingHeapOccupancyPercent=15"
                  "-XX:G1MixedGCLiveThresholdPercent=90"
                  "-XX:G1RSetUpdatingPauseTimePercent=5"
                  "-XX:SurvivorRatio=32"
                  "-XX:+PerfDisableSharedMem"
                  "-XX:MaxTenuringThreshold=1"
                  "-jar"
                  "/var/lib/minecraft/forge-1.12.2-14.23.5.2854.jar"
                  "nogui"
                ];
          Volumes = {
            "/var/lib/minecraft/world" = {};
          };
          WorkingDir = "/var/lib/minecraft";
          ExposedPorts = {
            "25565" = {};
          };
        };
      };
      ports = [
        "25565:25565"
      ];
      volumes = [
        "${ops}:/var/lib/minecraft/ops.json:ro"
        "${whitelist}:/var/lib/minecraft/whitelist.json:ro"
      ];
    };
  };
}