satr14
8745a66a2a
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101 lines
No EOL
3.9 KiB
Nix
101 lines
No EOL
3.9 KiB
Nix
{ inputs, lib, pkgs, ... }: let
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ram-allocation-mb = 12288;
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rcon-pass = "howdy";
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modpack = let
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commit = "8523f89493ace13087eb68cd9fe3b5eb4f669440";
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in pkgs.fetchPackwizModpack {
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packHash = "sha256-xB9Oc/aneogSQ9r7L42vyVM6xwq+QkoTaXYNuUzeo6M=";
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url = "https://git.satr14.my.id/satr14/server-modpack/raw/commit/${commit}/pack.toml";
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};
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in {
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imports = [ inputs.mc.nixosModules.minecraft-servers ];
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nixpkgs.overlays = [ inputs.mc.overlay ];
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powerManagement.cpuFreqGovernor = "powersave"; # performance governor causes overheating and thermal throttling, works fine with powesave
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boot.kernel.sysctl = {
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"vm.nr_hugepages" = (ram-allocation-mb / 2) + 512; # (heap_mb / 2MB per page) + 512 pages (1GB) for ZGC off-heap overhead
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"vm.swappiness" = 10;
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};
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services.minecraft-servers = {
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enable = true;
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eula = true;
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managementSystem.systemd-socket.enable = true;
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# ^^^ https://github.com/Infinidoge/nix-minecraft/issues/119
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# TODO: figure out how to set gamerules on start
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# gamerules to disable: locator_bar, mob_explosion_drop_decay, (and possibly) reduced_debug_info, global_sound_events
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# gamerules to enable (temporarily): noend:disable_end
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servers.da-s3 = {
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enable = true;
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autoStart = true;
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restart = "always";
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enableReload = false;
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operators."satr14" = {
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uuid = "54441a30-fe73-46e7-adca-c476bd4fc6d2";
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bypassesPlayerLimit = true;
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level = 4;
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};
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# ^^ DISABLE ON PROD
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serverProperties = {
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# server-ip = "localhost";
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server-port = 25565;
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server-name = "Minecraft Server";
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motd = "§lSeason 3§r - §dExplorers Creativity 🔥";
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log-ips = false; # TODO: figure out how to get ips from cloudflared tunnel
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difficulty = "normal";
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gamemode = "survival";
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max-world-size = 25000;
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spawn-protection = 0;
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pvp = true;
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online-mode = true;
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enable-query = true;
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enforce-secure-profile = false;
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pevent-proxy-connections = false;
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allow-flight = false;
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player-idle-timeout = 0;
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view-distance = 12;
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simulation-distance = 4;
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enable-rcon = true;
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sync-chunk-writes = false;
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"rcon.password" = rcon-pass;
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"rcon.port" = 25575;
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};
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symlinks = lib.mapAttrs'
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(name: _: lib.nameValuePair "mods/${name}" "${modpack}/mods/${name}")
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(builtins.readDir "${modpack}/mods");
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package = pkgs.fabricServers.fabric-1_21_11.override {
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jre_headless = pkgs.javaPackages.compiler.temurin-bin.jdk-25;
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loaderVersion = "0.19.2";
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};
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jvmOpts = let flags = [
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"-Xms${toString ram-allocation-mb}M"
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"-Xmx${toString ram-allocation-mb}M"
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"-XX:+UseZGC" # Use ZGC (requires Java v25+, 8+ CPU cores, 10GB+ RAM)
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"-XX:+UseCompactObjectHeaders" # Use compact object headers (requires Java v16+, saves a couple of bits per object)
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"--add-modules=jdk.incubator.vector" # Exposes SIMD instructions (requires full JDK, useful with performance mods)
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"-XX:+UseLargePages" # Large pages support (requires hugepages configured on the system)
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"-XX:+AlwaysPreTouch" # Pre-allocates memory on startup, OS claims it immediately for JVM instead of negotiating it
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"-XX:+DisableExplicitGC" # Disables mods from manually invoking the GC
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"-XX:+PerfDisableSharedMem" # Disables constant /tmp writes for JVM metrics
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"-XX:ZAllocationSpikeTolerance=5" # Helps when server is active with many players
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"-XX:SoftMaxHeapSize=${toString (ram-allocation-mb - 2048)}M" # Leave 2GB headroom
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"-XX:ZCollectionInterval=1" # Force a GC cycle at minimum every second
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"-XX:ConcGCThreads=8" # Threads ZGC uses for concurrent work
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]; in lib.concatStringsSep " " flags;
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};
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};
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} |