diff --git a/cmd/config/config.go b/cmd/config/config.go
index 3ded835..918fd53 100644
--- a/cmd/config/config.go
+++ b/cmd/config/config.go
@@ -2,16 +2,12 @@ package config
 
 import "github.com/urfave/cli/v2"
 
-var Command *cli.Command
-
-func init() {
-	Command = &cli.Command{
-		Name:  "config",
-		Usage: "config some settings",
-		Subcommands: []*cli.Command{
-			UserCommand,
-			DatabaseCommand,
-			DNSCommand,
-		},
-	}
+var Command = &cli.Command{
+	Name:  "config",
+	Usage: "config some settings",
+	Subcommands: []*cli.Command{
+		UserCommand,
+		DatabaseCommand,
+		DNSCommand,
+	},
 }
diff --git a/cmd/config/database.go b/cmd/config/database.go
index 5115a6e..5f354b3 100644
--- a/cmd/config/database.go
+++ b/cmd/config/database.go
@@ -7,23 +7,19 @@ import (
 	"github.com/urfave/cli/v2"
 )
 
-var DatabaseCommand *cli.Command
+var migrationCommand = &cli.Command{
+	Name:   "migrate",
+	Usage:  "migrate database",
+	Action: migrateDatabase,
+}
 
-func init() {
-	migrationCommand := &cli.Command{
-		Name:   "migrate",
-		Usage:  "migrate database",
-		Action: migrateDatabase,
-	}
-
-	DatabaseCommand = &cli.Command{
-		Name:    "database",
-		Usage:   "database administration",
-		Aliases: []string{"db"},
-		Subcommands: []*cli.Command{
-			migrationCommand,
-		},
-	}
+var DatabaseCommand = &cli.Command{
+	Name:    "database",
+	Usage:   "database administration",
+	Aliases: []string{"db"},
+	Subcommands: []*cli.Command{
+		migrationCommand,
+	},
 }
 
 func migrateDatabase(c *cli.Context) error {
diff --git a/cmd/config/dns.go b/cmd/config/dns.go
index cf2c3c5..727a6ba 100644
--- a/cmd/config/dns.go
+++ b/cmd/config/dns.go
@@ -5,24 +5,21 @@ import (
 	"reCoreD-UI/database"
 
 	"github.com/urfave/cli/v2"
+	"github.com/urfave/cli/v2/altsrc"
 )
 
-var DNSCommand *cli.Command
-
-func init() {
-	DNSCommand = &cli.Command{
-		Name:  "dns",
-		Usage: "Config DNS Settings",
-		Flags: []cli.Flag{
-			&cli.StringSliceFlag{
-				Name:     "servers",
-				Usage:    "dns servers",
-				Aliases:  []string{"s"},
-				Required: true,
-			},
-		},
-		Action: setDNS,
-	}
+var DNSCommand = &cli.Command{
+	Name:  "dns",
+	Usage: "Config DNS Settings",
+	Flags: []cli.Flag{
+		altsrc.NewStringSliceFlag(&cli.StringSliceFlag{
+			Name:     "servers",
+			Usage:    "dns servers",
+			Aliases:  []string{"s"},
+			Required: true,
+		}),
+	},
+	Action: setDNS,
 }
 
 func setDNS(c *cli.Context) error {
diff --git a/cmd/config/user.go b/cmd/config/user.go
index dafc096..0b49c96 100644
--- a/cmd/config/user.go
+++ b/cmd/config/user.go
@@ -5,32 +5,29 @@ import (
 	"reCoreD-UI/database"
 
 	"github.com/urfave/cli/v2"
+	"github.com/urfave/cli/v2/altsrc"
 )
 
-var UserCommand *cli.Command
-
-func init() {
-	UserCommand = &cli.Command{
-		Name:  "user",
-		Usage: "set admin username and password",
-		Flags: []cli.Flag{
-			&cli.StringFlag{
-				Name:    "username",
-				Aliases: []string{"u"},
-				Value:   "amdin",
-				Usage:   "admin username",
-				EnvVars: []string{"RECORED_ADMIN_USERNAME"},
-			},
-			&cli.StringFlag{
-				Name:     "passowrd",
-				Aliases:  []string{"p"},
-				Required: true,
-				Usage:    "admin password",
-				EnvVars:  []string{"RECORED_ADMIN_PASSWORD"},
-			},
-		},
-		Action: setUser,
-	}
+var UserCommand = &cli.Command{
+	Name:  "user",
+	Usage: "set admin username and password",
+	Flags: []cli.Flag{
+		altsrc.NewStringFlag(&cli.StringFlag{
+			Name:    "username",
+			Aliases: []string{"u"},
+			Value:   "amdin",
+			Usage:   "admin username",
+			EnvVars: []string{"RECORED_ADMIN_USERNAME"},
+		}),
+		altsrc.NewStringFlag(&cli.StringFlag{
+			Name:     "passowrd",
+			Aliases:  []string{"p"},
+			Required: true,
+			Usage:    "admin password",
+			EnvVars:  []string{"RECORED_ADMIN_PASSWORD"},
+		}),
+	},
+	Action: setUser,
 }
 
 func setUser(c *cli.Context) error {
diff --git a/cmd/server/server.go b/cmd/server/server.go
index eb9776b..ba64826 100644
--- a/cmd/server/server.go
+++ b/cmd/server/server.go
@@ -4,33 +4,30 @@ import (
 	webserver "reCoreD-UI/server"
 
 	"github.com/urfave/cli/v2"
+	"github.com/urfave/cli/v2/altsrc"
 )
 
-var Command *cli.Command
-
-func init() {
-	Command = &cli.Command{
-		Name:  "server",
-		Usage: "run server",
-		Flags: []cli.Flag{
-			&cli.StringFlag{
-				Name:  "prefix",
-				Value: "/",
-				Usage: "web prefix",
-			},
-			&cli.StringFlag{
-				Name:  "listen",
-				Value: "[::]",
-				Usage: "IP for listen at",
-			},
-			&cli.IntFlag{
-				Name:  "port",
-				Value: 8080,
-				Usage: "Port for listen at",
-			},
-		},
-		Action: runServer,
-	}
+var Command = &cli.Command{
+	Name:  "server",
+	Usage: "run server",
+	Flags: []cli.Flag{
+		altsrc.NewStringFlag(&cli.StringFlag{
+			Name:  "prefix",
+			Value: "/",
+			Usage: "web prefix",
+		}),
+		altsrc.NewStringFlag(&cli.StringFlag{
+			Name:  "listen",
+			Value: "[::]",
+			Usage: "IP for listen at",
+		}),
+		altsrc.NewIntFlag(&cli.IntFlag{
+			Name:  "port",
+			Value: 8080,
+			Usage: "Port for listen at",
+		}),
+	},
+	Action: runServer,
 }
 
 func runServer(c *cli.Context) error {
diff --git a/main.go b/main.go
index f1d4463..8d726c1 100644
--- a/main.go
+++ b/main.go
@@ -2,6 +2,8 @@ package main
 
 import (
 	"os"
+	"reCoreD-UI/cmd/config"
+	"reCoreD-UI/cmd/server"
 
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli/v2"
@@ -18,17 +20,14 @@ func main() {
 			Name:    "config",
 			Usage:   "config yaml file",
 			Aliases: []string{"c"},
-			Value:   "config.yaml",
 			EnvVars: []string{"RECORED_CONFIG_FILE"},
 		},
-		altsrc.NewStringSliceFlag(&cli.StringSliceFlag{}),
-		&cli.StringFlag{
+		altsrc.NewStringFlag(&cli.StringFlag{
 			Name:     "mysql-dsn",
 			Usage:    "mysql dsn",
-			Required: true,
 			EnvVars:  []string{"RECORED_MYSQL_DSN"},
-		},
-		&cli.BoolFlag{
+		}),
+		altsrc.NewBoolFlag(&cli.BoolFlag{
 			Name:  "debug",
 			Usage: "enable debug mode",
 			Value: false,
@@ -38,16 +37,21 @@ func main() {
 				}
 				return nil
 			},
-		},
+		}),
 	}
 
 	app := &cli.App{
 		Name:  "reCoreD-UI",
 		Usage: "Web UI for CoreDNS",
+		UseShortOptionHandling: true,
 		Before: altsrc.InitInputSourceWithContext(
 			flags, altsrc.NewYamlSourceFromFlagFunc("config"),
 		),
 		Flags: flags,
+		Commands: []*cli.Command{
+			server.Command,
+			config.Command,
+		},
 	}
 
 	if err := app.Run(os.Args); err != nil {