diff --git a/CHANGELOG.md b/CHANGELOG.md
index 681c15f..9273014 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## [Unreleased]
 
+## v1.3.0
+### Added
+- add argument to define the configuration file
+
 ## v1.2.0
 ### Added
 - allow to use a configuration file
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..4db19a3
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,9 @@
+FROM debian:stable-slim
+
+RUN apt-get update && apt-get install ca-certificates -y
+
+COPY ./capture /usr/bin/capture
+
+WORKDIR /app
+
+ENTRYPOINT ["/usr/bin/capture"]
diff --git a/README.md b/README.md
index 68bdfc7..3314d2c 100644
--- a/README.md
+++ b/README.md
@@ -13,13 +13,13 @@ Forked from [ofabricio/capture](https://github.com/ofabricio/capture).
 
 #### Settings
 
-| param        | description |
-|--------------|-------------|
-| `-url`       | **Required.** Set the url you want to proxy |
-| `-port`      | Set the proxy port. Default: *9000* |
-| `-dashboard` | Set the dashboard port. Default: *9001* |
-| `-captures`  | Set how many captures to show in the dashboard. Default: *16* |
-
+| param          | description                                                   |
+| -------------- | -------------                                                 |
+| `-url`         | **Required.** Set the url you want to proxy                   |
+| `-port`        | Set the proxy port. Default: *9000*                           |
+| `-dashboard`   | Set the dashboard port. Default: *9001*                       |
+| `-captures`    | Set how many captures to show in the dashboard. Default: *16* |
+| `-config`      | Set the configuration file. Default: *.capture.ini*           |
 
 You can create a file named `.capture.ini` and set the configuration inside:
 
@@ -37,10 +37,9 @@ address. Hence, calling `http://localhost:9000/users/1` is like calling `http://
 
 *Capture* saves all requests and responses so that you can see them in the dashboard.
 
-
 ## Dashboard
 
-To access the dashboard go to `http://localhost:9001/`
+To access the dashboard go to `http://127.0.0.1:9001/`
 
 ##### Preview
 
diff --git a/config.go b/config.go
index c571ebe..4344540 100644
--- a/config.go
+++ b/config.go
@@ -21,32 +21,34 @@ func ReadConfig() Config {
 	defaultProxyPort := "9000"
 	defaultDashboardPort := "9001"
 	defaultMaxCaptures := 16
-
-	configFile := ".capture.ini"
-
-	if _, err := os.Stat(configFile); err == nil {
-		cfg, err := ini.Load(configFile)
-
-		if err != nil {
-			fmt.Printf("Fail to read file %s: %v", configFile, err)
-			os.Exit(1)
-		}
-
-		section := cfg.Section("")
-
-		defaultTargetURL = section.Key("url").MustString(defaultTargetURL)
-		defaultProxyPort = section.Key("port").MustString(defaultProxyPort)
-		defaultDashboardPort = section.Key("dashboard").MustString(defaultDashboardPort)
-		defaultMaxCaptures = section.Key("captures").MustInt(defaultMaxCaptures)
-	}
+	defaultConfigFile := ".capture.ini"
 
 	targetURL := flag.String("url", defaultTargetURL, "Required. Set the url you want to proxy")
+	configFile := flag.String("config", defaultConfigFile, "Set the configuration file")
 	proxyPort := flag.String("port", defaultProxyPort, "Set the proxy port")
 	dashboardPort := flag.String("dashboard", defaultDashboardPort, "Set the dashboard port")
 	maxCaptures := flag.Int("captures", defaultMaxCaptures, "Set how many captures to show in the dashboard")
 
 	flag.Parse()
 
+	if _, err := os.Stat(*configFile); err == nil {
+		cfg, err := ini.Load(*configFile)
+
+		if err != nil {
+			fmt.Printf("Fail to read file %s: %v", *configFile, err)
+			os.Exit(1)
+		}
+
+		section := cfg.Section("")
+
+		return Config{
+			TargetURL:     section.Key("url").MustString(*targetURL),
+			ProxyPort:     section.Key("port").MustString(*proxyPort),
+			MaxCaptures:   section.Key("captures").MustInt(*maxCaptures),
+			DashboardPort: section.Key("dashboard").MustString(*dashboardPort),
+		}
+	}
+
 	return Config{
 		TargetURL:     *targetURL,
 		ProxyPort:     *proxyPort,
diff --git a/main.go b/main.go
index 7dac2f0..520bce7 100644
--- a/main.go
+++ b/main.go
@@ -30,9 +30,9 @@ var dashboardHTML []byte
 func main() {
 	cfg := ReadConfig()
 
-	fmt.Printf("Target is %s", cfg.TargetURL)
-	fmt.Printf("\nListening on http://localhost:%s", cfg.ProxyPort)
-	fmt.Printf("\nDashboard on http://localhost:%s", cfg.DashboardPort)
+	fmt.Printf("Target is %s\n", cfg.TargetURL)
+	fmt.Printf("Listening on http://127.0.0.1:%s\n", cfg.ProxyPort)
+	fmt.Printf("Dashboard on http://127.0.0.1:%s\n", cfg.DashboardPort)
 	fmt.Println()
 
 	srv := NewCaptureService(cfg.MaxCaptures)