HOST Variable

Dockerfile

@@ -23,6 +23,7 @@ COPY --from=build /app/static /app/static
 RUN mkdir -p /app/data && chown -R app:app /app
 
 EXPOSE 8002
+ENV HOST=0.0.0.0
 ENV PORT=8002
 
 USER app

README.md

@@ -40,6 +40,7 @@ Enterprise-style Scrum Poker application using Go, Gin, and SSE for real-time ro
 
 ## Environment Variables
 
+- `HOST`: server host/interface to bind (default all interfaces, equivalent to `0.0.0.0`)
 - `PORT`: server port (default `8002`)
 - `DATA_PATH`: directory for room JSON files (default `./data`)
 
@@ -52,6 +53,13 @@ go run ./src
 
 Open `http://localhost:8002`.
 
+To bind explicitly:
+
+```bash
+HOST=localhost PORT=8002 go run ./src
+HOST=0.0.0.0 PORT=8002 go run ./src
+```
+
 ## Docker
 
 Build:

src/config/config.go

@@ -3,11 +3,17 @@ package config
 import "os"
 
 type Config struct {
+	Host     string
 	Port     string
 	DataPath string
 }
 
 func Load() Config {
+	host := os.Getenv("HOST")
+	if host == "" {
+		host = "0.0.0.0"
+	}
+
 	port := os.Getenv("PORT")
 	if port == "" {
 		port = "8002"
@@ -19,6 +25,7 @@ func Load() Config {
 	}
 
 	return Config{
+		Host:     host,
 		Port:     port,
 		DataPath: dataPath,
 	}

src/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"log"
+	"net"
 
 	"scrum-solitare/src/config"
 	"scrum-solitare/src/handlers"
@@ -21,7 +22,7 @@ func main() {
 	rooms := handlers.NewRoomAPIHandler(manager)
 	router := server.NewRouter(pages, rooms)
 
-	if err := router.Run(":" + cfg.Port); err != nil {
+	if err := router.Run(net.JoinHostPort(cfg.Host, cfg.Port)); err != nil {
 		log.Fatalf("server failed to start: %v", err)
 	}
 }