Allow to specify ES_USERNAME/ES_PASSWORD environment variables to connect to the ES node

README.md

@@ -67,6 +67,9 @@ by replacing `.` and `-` with `_` and upper-casing the parameter name.
 
 #### Elasticsearch 7.x security privileges
 
+Username and password can be passed either directly in the URI or through the `ES_USERNAME` and `ES_PASSWORD` environment variables.
+Specifying those two environment variables will override authentication passed in the URI (if any).
+
 ES 7.x supports RBACs. The following security privileges are required for the elasticsearch_exporter.
 
 Setting | Privilege Required | Description

main.go

@@ -111,6 +111,13 @@ func main() {
 		os.Exit(1)
 	}
 
+	esUsername := os.Getenv("ES_USERNAME")
+	esPassword := os.Getenv("ES_PASSWORD")
+
+	if esUsername != "" && esPassword != "" {
+		esURL.User = url.UserPassword(esUsername, esPassword)
+	}
+
 	// returns nil if not provided and falls back to simple TCP.
 	tlsConfig := createTLSConfig(*esCA, *esClientCert, *esClientPrivateKey, *esInsecureSkipVerify)