diff --git a/cmd/api.go b/cmd/api.go
index 1cd3f14..e9779d0 100644
--- a/cmd/api.go
+++ b/cmd/api.go
@@ -5,7 +5,9 @@ package cmd
 
 import (
 	"fmt"
+	"log"
 
+	"git.agecem.com/agecem/bottin-ag/config"
 	"github.com/spf13/cobra"
 )
 
@@ -14,7 +16,13 @@ var apiCmd = &cobra.Command{
 	Use:   "api",
 	Short: "Start the API server",
 	Run: func(cmd *cobra.Command, args []string) {
-		fmt.Println("api called")
+		cfg, err := config.GetConfig()
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		fmt.Println("api called with api-port", cfg.API.Port)
+		fmt.Println("api called with web-port", cfg.Web.Port)
 	},
 }
 
diff --git a/cmd/root.go b/cmd/root.go
index 3332c5c..d73c696 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -5,8 +5,10 @@ package cmd
 
 import (
 	"fmt"
+	"log"
 	"os"
 
+	"git.agecem.com/agecem/bottin-ag/config"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 )
@@ -30,6 +32,10 @@ func init() {
 	cobra.OnInitialize(initConfig)
 
 	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.bottin-ag.yaml)")
+
+	if err := config.RegisterFlags(rootCmd); err != nil {
+		log.Fatal(err)
+	}
 }
 
 // initConfig reads in config file and ENV variables if set.
diff --git a/config/config.go b/config/config.go
index e69de29..e7698ea 100644
--- a/config/config.go
+++ b/config/config.go
@@ -0,0 +1,40 @@
+package config
+
+import (
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+type Config struct {
+	API APIConfig
+	Web WebConfig
+}
+
+type APIConfig struct {
+	Port int
+}
+
+type WebConfig struct {
+	Port int
+}
+
+func GetConfig() (cfg Config, err error) {
+	return cfg, viper.Unmarshal(&cfg)
+}
+
+// RegisterFlags adds persistent flags necessary to the application to the specified *cobra.Command
+func RegisterFlags(cmd *cobra.Command) error {
+	// api.port ; --api-port
+	cmd.PersistentFlags().Int("api-port", 3182, "API server port")
+	if err := viper.BindPFlag("api.port", cmd.PersistentFlags().Lookup("api-port")); err != nil {
+		return err
+	}
+
+	// web.port ; --web-port
+	cmd.PersistentFlags().Int("web-port", 3183, "Webserver port")
+	if err := viper.BindPFlag("web.port", cmd.PersistentFlags().Lookup("web-port")); err != nil {
+		return err
+	}
+
+	return nil
+}