Merge pull request #37289 from disassembler/dnsdist

nixos/dnsdist: init module

1 files changed, 61 insertions, 0 deletions

diff --git a/nixos/modules/services/networking/dnsdist.nix b/nixos/modules/services/networking/dnsdist.nix
new file mode 100644
index 000000000000..12eee136e639
--- /dev/null
+++ b/nixos/modules/services/networking/dnsdist.nix
@@ -0,0 +1,61 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.dnsdist;
+  configFile = pkgs.writeText "dndist.conf" ''
+    setLocal('${cfg.listenAddress}:${toString cfg.listenPort}')
+    ${cfg.extraConfig}
+    '';
+in {
+  options = {
+    services.dnsdist = {
+      enable = mkEnableOption "dnsdist domain name server";
+
+      listenAddress = mkOption {
+        type = types.str;
+        description = "Listen IP Address";
+        default = "0.0.0.0";
+      };
+      listenPort = mkOption {
+        type = types.int;
+        description = "Listen port";
+        default = 53;
+      };
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = ''
+        '';
+        description = ''
+          Extra lines to be added verbatim to dnsdist.conf.
+        '';
+      };
+    };
+  };
+
+  config = mkIf config.services.dnsdist.enable {
+    systemd.services.dnsdist = {
+      description = "dnsdist load balancer";
+      wantedBy = [ "multi-user.target" ];
+      after = ["network.target"];
+
+      serviceConfig = {
+        Restart="on-failure";
+        RestartSec="1";
+        DynamicUser = true;
+        StartLimitInterval="0";
+        PrivateTmp=true;
+        PrivateDevices=true;
+        CapabilityBoundingSet="CAP_NET_BIND_SERVICE CAP_SETGID CAP_SETUID";
+        ExecStart = "${pkgs.dnsdist}/bin/dnsdist --supervised --disable-syslog --config ${configFile}";
+        ProtectSystem="full";
+        ProtectHome=true;
+        RestrictAddressFamilies="AF_UNIX AF_INET AF_INET6";
+        LimitNOFILE="16384";
+        TasksMax="8192";
+      };
+    };
+  };
+}