Experiment with netdata

servers/cirno/configuration.nix

@@ -5,6 +5,7 @@
 		(modulesPath + "/virtualisation/amazon-image.nix")
 		<acm-aws/servers/base.nix>
 		./services.nix
+		./telemetry.nix
 	];
 
 	networking.hostName = "cirno";

servers/cirno/services.nix

@@ -48,37 +48,6 @@ in
 			};
 		};
 
-	# Gather system metrics using Telegraf into cirno's VictoriaMetrics.
-	services.telegraf = {
-		enable = true;
-		extraConfig = {
-			inputs = {
-				net    = {};
-				mem    = {};
-				disk   = {};
-				swap   = {};
-				system = {};
-				diskio = {};
-				processes = {};
-				prometheus = {
-					urls = [
-						"http://localhost:2019/metrics" # Caddy
-					];
-				};
-				systemd_units = {};
-				internet_speed = {
-					interval = "2h";
-				};
-			};
-			outputs = {
-				influxdb = {
-					database = "telegraf";
-					urls = [ "http://cs306:8428" ];
-				};
-			};
-		};
-	};
-
 	services.christmasd-test = {
 		enable = true;
 		ledPointsFile = builtins.fetchurl

servers/cirno/telemetry.nix

@@ -0,0 +1,60 @@
+{ config, lib, pkgs, ... }:
+
+{
+	# Enable netdata, which is a lightweight alternative to Grafana.
+	# https://nixos.wiki/wiki/Netdata
+	# https://dataswamp.org/~solene/2022-09-16-netdata-cloud-nixos.html
+	services.netdata = {
+		enable = true;
+		config = {
+			global = {
+				# Disable storage of metrics on disk.
+				"memory mode" = "none";
+			};
+			web = {
+				# Disable the web UI.
+				"mode" = "none";
+				"accept a streaming request every seconds" = 0;
+			};
+		};
+		configDir = {
+			"stream.conf" = pkgs.writeText "stream.conf" ''
+				[stream]
+					enabled = yes
+					api key = ${builtins.readFile <acm-aws/secrets/netdata-key>}
+					destination = cs306:19999
+			'';
+		};
+	};
+
+	# Gather system metrics using Telegraf into cirno's VictoriaMetrics.
+	services.telegraf = {
+		enable = true;
+		extraConfig = {
+			inputs = {
+				net    = {};
+				mem    = {};
+				disk   = {};
+				swap   = {};
+				system = {};
+				diskio = {};
+				processes = {};
+				prometheus = {
+					urls = [
+						"http://localhost:2019/metrics" # Caddy
+					];
+				};
+				systemd_units = {};
+				internet_speed = {
+					interval = "2h";
+				};
+			};
+			outputs = {
+				influxdb = {
+					database = "telegraf";
+					urls = [ "http://cs306:8428" ];
+				};
+			};
+		};
+	};
+}

servers/cs306/telemetry.nix

@@ -65,4 +65,24 @@
 			};
 		};
 	};
+
+	# Enable netdata, which is a lightweight alternative to Grafana.
+	# https://nixos.wiki/wiki/Netdata
+	# https://dataswamp.org/~solene/2022-09-16-netdata-cloud-nixos.html
+	services.netdata = {
+		enable = true;
+		configDir = {
+			"stream.conf" = pkgs.writeText "stream.conf" ''
+				[stream]
+					enabled = yes
+					enable compression = yes
+
+				[${builtins.readFile <acm-aws/secrets/netdata-key>}]
+					enabled = yes
+					allow from = 100.*
+					default memory mode = dbengine
+					health enabled by default = yes
+			'';
+		};
+	};
 }