1 files changed, 67 insertions, 0 deletions
diff --git a/nixpkgs/nixos/modules/services/network-filesystems/drbd.nix b/nixpkgs/nixos/modules/services/network-filesystems/drbd.nix
new file mode 100644
index 000000000000..57b1fbb597c7
--- /dev/null
+++ b/nixpkgs/nixos/modules/services/network-filesystems/drbd.nix
@@ -0,0 +1,67 @@
+# Support for DRBD, the Distributed Replicated Block Device.
+
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let cfg = config.services.drbd; in
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.drbd.enable = mkOption {
+      default = false;
+      type = types.bool;
+      description = ''
+        Whether to enable support for DRBD, the Distributed Replicated
+        Block Device.
+      '';
+    };
+
+    services.drbd.config = mkOption {
+      default = "";
+      type = types.string;
+      description = ''
+        Contents of the <filename>drbd.conf</filename> configuration file.
+      '';
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+
+    environment.systemPackages = [ pkgs.drbd ];
+
+    services.udev.packages = [ pkgs.drbd ];
+
+    boot.kernelModules = [ "drbd" ];
+
+    boot.extraModprobeConfig =
+      ''
+        options drbd usermode_helper=/run/current-system/sw/bin/drbdadm
+      '';
+
+    environment.etc = singleton
+      { source = pkgs.writeText "drbd.conf" cfg.config;
+        target = "drbd.conf";
+      };
+
+    systemd.services.drbd = {
+      after = [ "systemd-udev.settle.service" "network.target" ];
+      wants = [ "systemd-udev.settle.service" ];
+      wantedBy = [ "multi-user.target" ];
+      script = ''
+        ${pkgs.drbd}/sbin/drbdadm up all
+      '';
+      serviceConfig.ExecStop = ''
+        ${pkgs.drbd}/sbin/drbdadm down all
+      '';
+    };
+  };
+}