Add new cmd and config option to set node exporter target

cmd/config.go

@@ -77,11 +77,16 @@ func LoadConfig(fileSystem afero.Fs) (*agent.Config, error) {
 		DiscoveriesPeriodsConfig: discoveryPeriodsConfig,
 	}
 
+	prometheusTargets := discovery.PrometheusTargets{
+		discovery.NodeExporterName: viper.GetString("node-exporter-target"),
+	}
+
 	return &agent.Config{
 		AgentID:           agentID,
 		InstanceName:      hostname,
 		DiscoveriesConfig: discoveriesConfig,
 		FactsServiceURL:   viper.GetString("facts-service-url"),
 		PluginsFolder:     viper.GetString("plugins-folder"),
+		PrometheusTargets: prometheusTargets,
 	}, nil
 }

cmd/start.go

@@ -123,6 +123,14 @@ func NewStartCmd() *cobra.Command {
 
 	startCmd.Flags().String("facts-service-url", "amqp://guest:guest@localhost:5672", "Facts service queue url")
 
+	startCmd.Flags().
+		String(
+			"node-exporter-target",
+			"",
+			"Node exporter target address in ip:port notation. If not given the lowest "+
+				"ipv4 address with the default 9100 port is used",
+		)
+
 	return startCmd
 }
 

packaging/config/agent.yaml

@@ -94,4 +94,12 @@
 
 ## Facts gathering service URL
 
-# facts-service-url: amqp://guest:guest@localhost:5672
+# facts-service-url: amqp://guest:guest@localhost:5672
+
+###############################################################################
+
+## Prometheus exporters targets
+## Configure the prometheus targets. If not given, the lowest discovered IP address
+## with a default port numbers is used
+
+# node-exporter-target: 192.168.1.10:9100