diff --git a/attribute/attribute.go b/attribute/attribute.go
index 6700e6d..a6608d7 100644
--- a/attribute/attribute.go
+++ b/attribute/attribute.go
@@ -4,8 +4,8 @@ import (
 	"time"
 
 	"github.com/rs/zerolog"
-	"github.com/rs/zerolog/log"
 	"kumoly.io/kumoly/app/store"
+	"kumoly.io/kumoly/app/util"
 )
 
 type Attribute struct {
@@ -23,7 +23,7 @@ type Attribute struct {
 var l zerolog.Logger
 
 func Init() {
-	l = log.With().Str("mod", "attribute").Logger()
+	l = util.Klog.With().Str("mod", "attribute").Logger()
 
 	l.Debug().Str("service", "attribute.Service").
 		Msg("Migrating database for attribute.Service ...")
diff --git a/auth/api_auth.go b/auth/api_auth.go
index 7df564f..b29b530 100644
--- a/auth/api_auth.go
+++ b/auth/api_auth.go
@@ -6,7 +6,6 @@ import (
 	"time"
 
 	"github.com/gin-gonic/gin"
-	"github.com/rs/zerolog/log"
 	"kumoly.io/kumoly/app/errors"
 	"kumoly.io/kumoly/app/history"
 	"kumoly.io/kumoly/app/server"
@@ -27,7 +26,7 @@ func ApiLogin(c *gin.Context) {
 	if err != nil {
 		panic(err)
 	}
-	// log.Trace().Str("mod", "auth").
+	// l.Trace().Str("mod", "auth").
 	// 	Str("username", data.Name).Str("password", string(pwd)).
 	// 	Msg("user login")
 	usr := &User{}
@@ -53,7 +52,7 @@ func ApiLogin(c *gin.Context) {
 	}
 	err = usr.ValidatePassword(string(pwd))
 	if err != nil {
-		log.Error().Str("mod", "auth").Err(err).Msg("wrong password")
+		l.Error().Str("mod", "auth").Err(err).Msg("wrong password")
 		usr.LoginFailed += 1
 		DB.Model(&usr).Update("login_failed", usr.LoginFailed)
 		panic(ErrorLoginFailed)
@@ -62,7 +61,7 @@ func ApiLogin(c *gin.Context) {
 		panic(ErrorUserIsSSO)
 	}
 	if !usr.Activated {
-		log.Error().Str("mod", "auth").
+		l.Error().Str("mod", "auth").
 			Err(ErrorUserNotActivated).
 			Str("user", usr.Username).Str("uid", usr.ID).
 			Msg("not activated")
diff --git a/auth/helper.go b/auth/helper.go
index c0b620f..0a654e9 100644
--- a/auth/helper.go
+++ b/auth/helper.go
@@ -23,7 +23,7 @@ func (c *Claims) HasGroup(grps ...string) bool {
 }
 
 func (srv Service) SetDefaultGroups() error {
-	srv.Logger.Debug().Msg("Setup default groups")
+	l.Debug().Msg("Setup default groups")
 	for _, g := range []string{SYSTEM, ADMIN, USER} {
 		grp := &Group{}
 		if err := DB.Where("name = ?", g).First(grp).Error; err != nil {
@@ -31,7 +31,7 @@ func (srv Service) SetDefaultGroups() error {
 				Name: g,
 			}).Error
 			if err != nil {
-				srv.Logger.Error().Err(err).Msg("create group error")
+				l.Error().Err(err).Msg("create group error")
 				return err
 			}
 		}
@@ -43,7 +43,7 @@ func (srv Service) SetDefaultAdmin(username, password string) error {
 	admin := &Group{}
 	err := DB.Where("name = ?", ADMIN).First(admin).Error
 	if err != nil {
-		srv.Logger.Error().Err(err).Msg("SetDefaultAdmin")
+		l.Error().Err(err).Msg("SetDefaultAdmin")
 		return err
 	}
 	usrgrp := struct {
@@ -54,12 +54,12 @@ func (srv Service) SetDefaultAdmin(username, password string) error {
 		Raw("select * from user_groups where group_id = ?", admin.ID).
 		Scan(&usrgrp)
 	if result.Error != nil {
-		srv.Logger.Error().Err(result.Error).Msg("SetDefaultAdmin")
+		l.Error().Err(result.Error).Msg("SetDefaultAdmin")
 		return result.Error
 	}
 	usr := &User{}
 	if result.RowsAffected == 0 {
-		srv.Logger.Debug().Msg("Setting up admin account")
+		l.Debug().Msg("Setting up admin account")
 		pwd, _ := bcrypt.GenerateFromPassword([]byte(password), 14)
 		usr.Username = username
 		usr.Password = string(pwd)
diff --git a/auth/jwt.go b/auth/jwt.go
index b9ccaa4..4e6f79c 100644
--- a/auth/jwt.go
+++ b/auth/jwt.go
@@ -8,10 +8,11 @@ import (
 	"github.com/gin-gonic/gin"
 	"github.com/golang-jwt/jwt"
 	"github.com/rs/xid"
-	"github.com/rs/zerolog/log"
+	"github.com/rs/zerolog"
 	"github.com/spf13/viper"
 	"kumoly.io/kumoly/app/errors"
 	"kumoly.io/kumoly/app/system"
+	"kumoly.io/kumoly/app/util"
 )
 
 const GinClaimKey = "claim"
@@ -37,7 +38,10 @@ type Auth struct {
 	Secret         string
 }
 
+var l zerolog.Logger
+
 func NewAuth() *Auth {
+	l = util.Klog.With().Str("mod", "auth").Logger()
 	return &Auth{
 		CookieMode:     true,
 		CookieSecure:   strings.HasPrefix(viper.GetString("server.url"), "https"),
@@ -148,7 +152,7 @@ func (srv Auth) NewToken(claims Claims) (tok string, err error) {
 	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
 	tok, err = token.SignedString([]byte(srv.Secret))
 	if err != nil {
-		log.Error().Str("mod", "auth").Err(err).Msg("NewToken")
+		l.Error().Err(err).Msg("NewToken")
 	}
 	return
 }
@@ -162,13 +166,13 @@ func (srv Auth) Middleware(c *gin.Context) {
 			claims.ExpiresAt = time.Now().Unix() + srv.TokenExpire
 			tok, err := srv.NewToken(*claims)
 			if err != nil {
-				log.Debug().Str("mod", "auth").Err(err).Msg("Middleware")
+				l.Debug().Err(err).Msg("Middleware")
 			} else {
 				srv.SetToken(c, tok)
 			}
 		}
 	} else {
-		log.Trace().Err(err).Msg("")
+		l.Trace().Err(err).Msg("")
 	}
 }
 
diff --git a/auth/service.go b/auth/service.go
index bde9f4c..6446340 100644
--- a/auth/service.go
+++ b/auth/service.go
@@ -1,13 +1,12 @@
 package auth
 
 import (
-	"github.com/rs/zerolog"
-	"github.com/rs/zerolog/log"
 	"github.com/spf13/viper"
 	"gorm.io/gorm"
 	"kumoly.io/kumoly/app/server"
 	"kumoly.io/kumoly/app/store"
 	"kumoly.io/kumoly/app/system"
+	"kumoly.io/kumoly/app/util"
 )
 
 var DB *gorm.DB
@@ -18,13 +17,10 @@ func SetDB(db *gorm.DB) {
 
 type Service struct {
 	system.BaseService
-	Logger zerolog.Logger
-
-	server *server.Service
 }
 
-func New(s *server.Service) *Service {
-	return &Service{server: s}
+func New() *Service {
+	return &Service{}
 }
 
 func (srv Service) GetName() string           { return "auth.Service" }
@@ -32,15 +28,14 @@ func (srv Service) GetDependencies() []string { return []string{"server.Service"
 func (srv Service) IsService() bool           { return true }
 
 func (srv Service) Init() error {
-	srv.Logger = log.With().Str("mod", "auth").Str("service", "auth.Service").Logger()
-
-	srv.Logger.Debug().Msg("Migrating database for auth.Service ...")
+	l = util.Klog.With().Str("mod", "auth").Logger()
+	l.Debug().Msg("Migrating database for auth.Service ...")
 	if err := store.Migrate(&User{}, &Profile{}, &Group{}); err != nil {
-		srv.Logger.Error().Err(err).Msg("Migrating database")
+		l.Error().Err(err).Msg("Migrating database")
 		return err
 	}
 
-	srv.Logger.Debug().Msg("Checking db state")
+	l.Debug().Msg("Checking db state")
 
 	// add default group
 	if err := srv.SetDefaultGroups(); err != nil {
@@ -59,10 +54,10 @@ func (srv Service) Init() error {
 }
 
 func (srv Service) Load() error {
-	srv.server.API.POST("/login", ApiLogin)
-	srv.server.API.POST("/logout", ApiLogout)
-	srv.server.API.GET("/whoami", ApiMe)
-	usrAPI := srv.server.API.Group("usr")
+	server.API.POST("/login", ApiLogin)
+	server.API.POST("/logout", ApiLogout)
+	server.API.GET("/whoami", ApiMe)
+	usrAPI := server.API.Group("usr")
 	usrAPI.POST("/", ACAdmin(), ApiUserNew)
 	usrAPI.GET("/", ACAdmin(), ApiUsers)
 	usrAPI.DELETE("/:id", ACAdmin(), ApiUserDelete)
@@ -70,7 +65,7 @@ func (srv Service) Load() error {
 	usrAPI.PUT("/activate/:id", ACAdmin(), ApiUserActivate)
 	usrAPI.PUT("/deactivate/:id", ACAdmin(), ApiUserDeactivate)
 
-	grpAPI := srv.server.API.Group("grp")
+	grpAPI := server.API.Group("grp")
 	grpAPI.GET("/", ACAdmin(), ApiGrps)
 	grpAPI.POST("/", ACAdmin(), ApiGrpNew)
 	grpAPI.PUT("/", ApiGrpUpdate)
diff --git a/auth/user.go b/auth/user.go
index 37fed35..5a9cfda 100644
--- a/auth/user.go
+++ b/auth/user.go
@@ -4,7 +4,6 @@ import (
 	"time"
 
 	"github.com/rs/xid"
-	"github.com/rs/zerolog/log"
 	"golang.org/x/crypto/bcrypt"
 	"gorm.io/gorm"
 )
@@ -63,7 +62,7 @@ func (usr *User) ChangePassword(db *gorm.DB, to string) (err error) {
 		return tx.Model(usr).Update("password", string(bytes)).Error
 	})
 	if err != nil {
-		log.Error().Str("mod", "auth").Err(err).Msg("ChangePassword")
+		l.Error().Err(err).Msg("ChangePassword")
 	}
 	return err
 }
diff --git a/helper.go b/helper.go
index 4534ba7..4b1bace 100644
--- a/helper.go
+++ b/helper.go
@@ -14,6 +14,7 @@ import (
 )
 
 func Default() *system.System {
+	system.Setup()
 	store.Setup()
 	sys := system.New()
 	server := server.New(viper.GetString("name"))
@@ -24,7 +25,7 @@ func Default() *system.System {
 	auth.SetDB(store.DB)
 
 	sys.Inject(auth.Injector(server.API))
-	sys.Append(server, auth.New(server),
+	sys.Append(server, auth.New(),
 		&task.Service{},
 		&history.Service{},
 		&email.Service{},
diff --git a/history/history.go b/history/history.go
index d583992..e5faaf2 100644
--- a/history/history.go
+++ b/history/history.go
@@ -6,7 +6,6 @@ import (
 	"sync"
 	"time"
 
-	"github.com/rs/zerolog/log"
 	"gorm.io/gorm"
 	"kumoly.io/kumoly/app/errors"
 	"kumoly.io/kumoly/app/store"
@@ -40,7 +39,7 @@ type History struct {
 func (h *History) BeforeCreate(tx *gorm.DB) (err error) {
 	if h.Body != nil {
 		if body, err := json.Marshal(h.Body); err != nil {
-			log.Error().Str("mod", "history").Err(err).Msg("history create error")
+			l.Error().Str("mod", "history").Err(err).Msg("history create error")
 		} else {
 			h.BodyJson = string(body)
 		}
@@ -87,14 +86,14 @@ func Stop() {
 		return
 	}
 	quit <- struct{}{}
-	log.Debug().Str("mod", "history").Msg("stop received")
+	l.Debug().Str("mod", "history").Msg("stop received")
 	wg.Wait()
-	log.Debug().Str("mod", "history").Msg("stopped")
+	l.Debug().Str("mod", "history").Msg("stopped")
 }
 
 func Send(h *History) {
 	if len(started) == 0 {
-		log.Warn().Str("mod", "history").
+		l.Warn().Str("mod", "history").
 			Interface("history", h).
 			Msg("history reporter has not started, report will be discarded")
 	}
@@ -111,7 +110,7 @@ var Interceptor func(*History) = nil
 var DBReceiver Receiver = func(h *History) {
 	err := store.DB.Create(h).Error
 	if err != nil {
-		log.Error().Str("mod", "history").
+		l.Error().Str("mod", "history").
 			Interface("history", h).
 			Err(err).Msg("DBReceiver error")
 	}
diff --git a/history/service.go b/history/service.go
index 33afdf6..97997d6 100644
--- a/history/service.go
+++ b/history/service.go
@@ -1,21 +1,22 @@
 package history
 
 import (
-	"github.com/rs/zerolog/log"
+	"github.com/rs/zerolog"
 	"kumoly.io/kumoly/app/store"
+	"kumoly.io/kumoly/app/util"
 )
 
 type Service struct {
 }
 
+var l zerolog.Logger
+
 func (srv Service) GetName() string           { return "history.Service" }
 func (srv Service) IsService() bool           { return true }
 func (srv Service) GetDependencies() []string { return []string{"server.Service"} }
 
 func (srv Service) Init() error {
-	l := log.With().Str("mod", "history").
-		Str("service", "history.Service").
-		Logger()
+	l = util.Klog.With().Str("mod", "history").Logger()
 	l.Debug().Msg("Migrating database for history.Service ...")
 	if err := store.Migrate(&History{}); err != nil {
 		l.Error().Err(err).Msg("Migrating database")
diff --git a/server/middleware.go b/server/middleware.go
index a8258bf..db89fe5 100644
--- a/server/middleware.go
+++ b/server/middleware.go
@@ -34,7 +34,7 @@ func (srv *Service) Default(c *gin.Context) {
 			}
 			if !util.PROD {
 				cl.Caller(2)
-				cl.Str("trace", util.Stack())
+				// cl.Str("trace", util.Stack())
 			}
 		} else if c.Writer.Status() >= 400 {
 			cl = srv.l.Error().Strs("error", c.Errors.Errors())
diff --git a/server/service.go b/server/service.go
index d573fa6..5af21ae 100644
--- a/server/service.go
+++ b/server/service.go
@@ -6,9 +6,9 @@ import (
 
 	"github.com/gin-gonic/gin"
 	"github.com/rs/zerolog"
-	"github.com/rs/zerolog/log"
 	"github.com/spf13/viper"
 	"kumoly.io/kumoly/app/history"
+	"kumoly.io/kumoly/app/util"
 )
 
 type SkipLogFunc func(c *gin.Context) bool
@@ -44,14 +44,14 @@ func New(name string) *Service {
 	if ipnetstr := viper.GetString("server.allow"); ipnetstr != "" {
 		_, ipnet, err := net.ParseCIDR(ipnetstr)
 		if err != nil {
-			log.Panic().Str("service", "server.Service").Str("name", name).Err(err).Msg("ParseCIDR error")
+			util.Klog.Panic().Str("service", "server.Service").Str("name", name).Err(err).Msg("ParseCIDR error")
 		}
 		srv.Allow = ipnet
 	}
 	return srv
 }
 func (srv *Service) Init() error {
-	srv.l = log.With().Str("service", "server.Service").Str("name", srv.Name).Logger()
+	srv.l = util.Klog.With().Str("service", "server.Service").Str("name", srv.Name).Logger()
 	return nil
 }
 func (srv *Service) Load() error {
diff --git a/store/db.go b/store/db.go
index 31cb054..65b4b5c 100644
--- a/store/db.go
+++ b/store/db.go
@@ -5,7 +5,7 @@ import (
 	"path/filepath"
 	"time"
 
-	"github.com/rs/zerolog/log"
+	"github.com/rs/zerolog"
 	"github.com/spf13/viper"
 	"gorm.io/driver/mysql"
 	"gorm.io/driver/postgres"
@@ -57,13 +57,16 @@ func init() {
 	viper.SetDefault("db.automigrate", true)
 }
 
+var l zerolog.Logger
+
 // Init initialize default db using New() followed by Connect()
 func Setup() {
+	l = util.Klog.With().Str("mod", "store").Logger()
 	var err error
 	std = New(DBTYPE(viper.GetString("db.type")))
 	DB, err = std.Connect()
 	if err != nil {
-		log.Error().Str("mod", "store").Err(err).Msg("std connection error")
+		l.Error().Err(err).Msg("std connection error")
 		panic(err)
 	}
 }
@@ -88,7 +91,7 @@ func New(t DBTYPE) *Store {
 		s.Path = viper.GetString("data")
 	} else {
 		err := fmt.Errorf("unknown db type %s", t)
-		log.Error().Str("mod", "store").Err(err).Msg("unknown db type")
+		l.Error().Err(err).Msg("unknown db type")
 		panic(err)
 	}
 	return s
@@ -116,7 +119,7 @@ func (s *Store) Connect() (db *gorm.DB, err error) {
 }
 
 func (s *Store) postgresConnector() error {
-	log.Info().Str("mod", "store").Msg("Connecting to postgres...")
+	l.Info().Msg("Connecting to postgres...")
 	dsn := fmt.Sprintf(
 		"host=%v user=%v password=%v dbname=%v port=%v sslmode=disable TimeZone=Asia/Taipei",
 		s.Host, s.User, s.Password, s.Name, s.Port,
@@ -134,22 +137,22 @@ func (s *Store) postgresConnector() error {
 		if inter <= 0 {
 			inter = 5
 		}
-		log.Warn().Str("mod", "store").Err(err).Msg("Unable to connect to database")
-		log.Warn().Str("mod", "store").Msgf("Retrying in %v second.", inter)
+		l.Warn().Err(err).Msg("Unable to connect to database")
+		l.Warn().Msgf("Retrying in %v second.", inter)
 		time.Sleep(time.Second * inter)
 	}
-	log.Info().Str("mod", "store").Msg("Connection to postgres, ok.")
+	l.Info().Msg("Connection to postgres, ok.")
 	return nil
 }
 
 //mysqlConnector connection
 func (s *Store) mysqlConnector() error {
-	log.Info().Str("mod", "store").Msg("Connecting to mysql...")
+	l.Info().Msg("Connecting to mysql...")
 	dsn := fmt.Sprintf(
 		"%v:%v@tcp(%v:%v)/%v?charset=utf8mb4&parseTime=True&loc=Local",
 		s.User, s.Password, s.Host, s.Port, s.Name,
 	)
-	// log.Debug(dsn)
+	// l.Debug(dsn)
 	for {
 		db, err := gorm.Open(mysql.New(mysql.Config{
 			DSN:               dsn, // data source name
@@ -163,11 +166,11 @@ func (s *Store) mysqlConnector() error {
 		if inter <= 0 {
 			inter = 5
 		}
-		log.Warn().Str("mod", "store").Err(err).Msg("Unable to connect to database")
-		log.Warn().Str("mod", "store").Msgf("Retrying in %v second.", inter)
+		l.Warn().Err(err).Msg("Unable to connect to database")
+		l.Warn().Msgf("Retrying in %v second.", inter)
 		time.Sleep(time.Second * inter)
 	}
-	log.Info().Str("mod", "store").Msg("Connection to mysql, ok.")
+	l.Info().Msg("Connection to mysql, ok.")
 	return nil
 }
 
@@ -175,10 +178,10 @@ func (s *Store) mysqlConnector() error {
 func (s *Store) sqliteConnector() error {
 	util.Mkdir(s.Path)
 	dbPath := filepath.Join(s.Path, s.Name+".db")
-	log.Info().Str("mod", "store").Str("path", dbPath).Msg("Connecting to sqlite...")
+	l.Info().Str("path", dbPath).Msg("Connecting to sqlite...")
 	db, err := gorm.Open(sqlite.Open(dbPath), s.config)
 	if err != nil {
-		log.Error().Str("mod", "store").Err(err).Msg("failed to connect database")
+		l.Error().Err(err).Msg("failed to connect database")
 		return err
 	}
 	s.DB = db
@@ -187,7 +190,7 @@ func (s *Store) sqliteConnector() error {
 
 func (s *Store) Migrate(dst ...interface{}) error {
 	if !s.AutoMigrate {
-		log.Debug().Str("mod", "store").Msg("AutoMigration is set to off, migration skipped")
+		l.Debug().Msg("AutoMigration is set to off, migration skipped")
 		return nil
 	}
 	return s.DB.AutoMigrate(dst...)
diff --git a/system/setup.go b/system/setup.go
index d46de41..1111bde 100644
--- a/system/setup.go
+++ b/system/setup.go
@@ -10,7 +10,6 @@ import (
 
 	"github.com/fatih/color"
 	"github.com/rs/zerolog"
-	"github.com/rs/zerolog/log"
 	"github.com/spf13/viper"
 	"kumoly.io/kumoly/app/util"
 )
@@ -44,19 +43,16 @@ func init() {
 	viper.SetEnvKeyReplacer(replacer)
 	viper.AutomaticEnv()
 	viper.SetConfigType("json")
-	Setup()
 }
 
-func Setup() {
-	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
-	zerolog.DurationFieldInteger = true
-	zerolog.SetGlobalLevel(zerolog.Level(viper.GetInt("log.level")))
-	util.PROD = viper.GetBool("prod")
+var setupped bool = false
+
+func SetupLogger(l zerolog.Logger, skip ...int) zerolog.Logger {
 	if !util.PROD {
-		log.Logger = log.With().Caller().Logger()
+		l = l.With().Caller().Logger()
 	}
 	if viper.GetBool("log.pretty") {
-		log.Logger = log.Output(zerolog.ConsoleWriter{
+		l = l.Output(zerolog.ConsoleWriter{
 			Out:        os.Stdout,
 			TimeFormat: "2006/01/02 15:04:05",
 			FormatCaller: func(i interface{}) string {
@@ -90,7 +86,23 @@ func Setup() {
 			},
 		})
 	}
-	l = log.With().Str("mod", "system").Logger()
+	return l
+}
+
+func Setup() {
+	if setupped {
+		return
+	} else {
+		setupped = true
+	}
+	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
+	zerolog.DurationFieldInteger = true
+	zerolog.SetGlobalLevel(zerolog.Level(viper.GetInt("log.level")))
+	util.PROD = viper.GetBool("prod")
+
+	util.Klog = SetupLogger(util.Klog)
+
+	l = util.Klog.With().Str("mod", "system").Logger()
 
 	tz, err := time.LoadLocation(viper.GetString("timezone"))
 	if err == nil {
diff --git a/task/task.go b/task/task.go
index 9f4388c..ca4a286 100644
--- a/task/task.go
+++ b/task/task.go
@@ -6,7 +6,6 @@ import (
 
 	cron "github.com/robfig/cron/v3"
 	"github.com/rs/zerolog"
-	"github.com/rs/zerolog/log"
 	"kumoly.io/kumoly/app/util"
 )
 
@@ -19,7 +18,7 @@ func init() {
 }
 
 func Init() {
-	l = log.With().Str("mod", "task").Logger()
+	l = util.Klog.With().Str("mod", "task").Logger()
 	c = cron.New(
 		cron.WithLogger(&clog),
 		cron.WithChain(func(j cron.Job) cron.Job {
diff --git a/util/logging.go b/util/logging.go
index 6d170f9..6bad037 100644
--- a/util/logging.go
+++ b/util/logging.go
@@ -5,8 +5,13 @@ import (
 	"fmt"
 	"io/ioutil"
 	"runtime"
+
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
 )
 
+var Klog zerolog.Logger = log.Logger
+
 func Stack() string {
 	buf := make([]byte, 1024)
 	for {