port and ip as ENV for docker

Dockerfile

@@ -30,6 +30,6 @@ WORKDIR /app
 VOLUME /app
 EXPOSE $PORT
 
-HEALTHCHECK --interval=5s --timeout=5s --retries=5 CMD curl -s "http://localhost:8080/health" | jq -r -e ".online==true"
+HEALTHCHECK --interval=5s --timeout=5s --retries=5 CMD curl -s "http://localhost:$PORT/health" | jq -r -e ".online==true"
 
-CMD ["statping", "--port", "$PORT"]
+CMD statping -port $PORT

cmd/cli.go

@@ -217,7 +217,9 @@ func HelpEcho() {
 	fmt.Println("     -ip 127.0.0.1             - Run HTTP server on specific IP address (default: localhost)")
 	fmt.Println("     -port 8080                - Run HTTP server on Port (default: 8080)")
 	fmt.Printf("Environment Variables:\n")
-	fmt.Println("     STATPING_DIR                - Set a absolute path for the root path of Statping server (logs, assets, SQL db)")
+	fmt.Println("     PORT                      - Set the outgoing port for the HTTP server (or use -port)")
+	fmt.Println("     IP                        - Bind a specific IP address to the HTTP server (or use -ip)")
+	fmt.Println("     STATPING_DIR              - Set a absolute path for the root path of Statping server (logs, assets, SQL db)")
 	fmt.Println("     DB_CONN                   - Automatic Database connection (sqlite, postgres, mysql)")
 	fmt.Println("     DB_HOST                   - Database hostname or IP address")
 	fmt.Println("     DB_USER                   - Database username")

cmd/main.go

@@ -51,6 +51,12 @@ func parseFlags() {
 	flag.Parse()
 	ipAddress = *ip
 	port = *p
+	if os.Getenv("PORT") != "" {
+		port = int(utils.ToInt(os.Getenv("PORT")))
+	}
+	if os.Getenv("IP") != "" {
+		ipAddress = os.Getenv("IP")
+	}
 }
 
 // main will run the Statping application

heroku.yml

@@ -1,3 +1,5 @@
 build:
   docker:
-    web: Dockerfile
+    web: Dockerfile
+run:
+  web: statping -port $PORT