the-infra/common/base-server.nix

{ lib, pkgs, ... }: {
  nixpkgs.overlays = import ../overlays;

  nix.package = lib.mkDefault pkgs.lix;
  services.openssh.enable = lib.mkForce true;

  networking.firewall.enable = true;
  networking.firewall.logRefusedConnections = false;
  networking.firewall.logReversePathDrops = true;

  services.nginx = {
    recommendedOptimisation = lib.mkDefault true;
    recommendedTlsSettings = lib.mkDefault true;
    recommendedProxySettings = lib.mkDefault true;
    recommendedGzipSettings = lib.mkDefault true;
    eventsConfig = ''
      worker_connections 8192;
    '';
    appendConfig = ''
      worker_rlimit_nofile 16384;
    '';
  };

  nix.gc = {
    automatic = true;
    persistent = true;
    dates = "daily";
    options = "--delete-older-than 30d";
  };

  services.journald.extraConfig = "SystemMaxUse=512M";

  boot.kernelParams = [
    "panic=30" "boot.panic_on_fail"
  ];

  boot.kernel.sysctl = {
    # Set default TCP congestion control algorithm
    "net.ipv4.tcp_congestion_control" = "bbr";

    # Enable ECN
    "net.ipv4.tcp_ecn" = 1;

    # Enable TCP fast open
    "net.ipv4.tcp_fastopen" = 3;
  };

  # reduce closure size, feel free to add your locale here
  i18n.supportedLocales = [
    "en_US.UTF-8/UTF-8"
    "fr_FR.UTF-8/UTF-8"
  ];
}