diff --git a/commands/configtest.go b/commands/configtest.go
index ce5c14ec..8839f746 100644
--- a/commands/configtest.go
+++ b/commands/configtest.go
@@ -79,7 +79,6 @@ func (p *ConfigtestCmd) SetFlags(f *flag.FlagSet) {
 
 // Execute execute
 func (p *ConfigtestCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
-	// Setup Logger
 	util.Log = util.NewCustomLogger(c.ServerInfo{})
 
 	if err := mkdirDotVuls(); err != nil {
diff --git a/commands/report.go b/commands/report.go
index 43b3a82d..c6dd9987 100644
--- a/commands/report.go
+++ b/commands/report.go
@@ -17,7 +17,6 @@ import (
 	"github.com/future-architect/vuls/util"
 	"github.com/google/subcommands"
 	"github.com/k0kubun/pp"
-	cvelog "github.com/kotakanbe/go-cve-dictionary/log"
 )
 
 // ReportCmd is subcommand for reporting
@@ -212,8 +211,6 @@ func (p *ReportCmd) SetFlags(f *flag.FlagSet) {
 // Execute execute
 func (p *ReportCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
 	util.Log = util.NewCustomLogger(c.ServerInfo{})
-	cvelog.SetLogger(c.Conf.LogDir, false, c.Conf.Debug, false)
-
 	if err := c.Load(p.configPath, ""); err != nil {
 		util.Log.Errorf("Error loading %s, %+v", p.configPath, err)
 		return subcommands.ExitUsageError
diff --git a/commands/scan.go b/commands/scan.go
index d200b70e..510a5d33 100644
--- a/commands/scan.go
+++ b/commands/scan.go
@@ -49,6 +49,7 @@ func (*ScanCmd) Usage() string {
 		[-timeout=300]
 		[-timeout-scan=7200]
 		[-debug]
+		[-quiet]
 		[-pipe]
 		[-vvv]
 		[-ips]
@@ -61,6 +62,7 @@ func (*ScanCmd) Usage() string {
 // SetFlags set flag
 func (p *ScanCmd) SetFlags(f *flag.FlagSet) {
 	f.BoolVar(&c.Conf.Debug, "debug", false, "debug mode")
+	f.BoolVar(&c.Conf.Quiet, "quiet", false, "Quiet mode. No output on stdout")
 
 	wd, _ := os.Getwd()
 	defaultConfPath := filepath.Join(wd, "config.toml")
diff --git a/commands/server.go b/commands/server.go
index 9bb9dc76..9ed06149 100644
--- a/commands/server.go
+++ b/commands/server.go
@@ -19,7 +19,6 @@ import (
 	"github.com/future-architect/vuls/server"
 	"github.com/future-architect/vuls/util"
 	"github.com/google/subcommands"
-	cvelog "github.com/kotakanbe/go-cve-dictionary/log"
 )
 
 // ServerCmd is subcommand for server
@@ -142,8 +141,6 @@ func (p *ServerCmd) SetFlags(f *flag.FlagSet) {
 // Execute execute
 func (p *ServerCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
 	util.Log = util.NewCustomLogger(c.ServerInfo{})
-	cvelog.SetLogger(c.Conf.LogDir, false, c.Conf.Debug, false)
-
 	if p.configPath != "" {
 		if err := c.Load(p.configPath, ""); err != nil {
 			util.Log.Errorf("Error loading %s. err: %+v", p.configPath, err)
diff --git a/commands/tui.go b/commands/tui.go
index 1ffe8ee5..f69e63cf 100644
--- a/commands/tui.go
+++ b/commands/tui.go
@@ -16,7 +16,6 @@ import (
 	"github.com/future-architect/vuls/report"
 	"github.com/future-architect/vuls/util"
 	"github.com/google/subcommands"
-	cvelog "github.com/kotakanbe/go-cve-dictionary/log"
 )
 
 // TuiCmd is Subcommand of host discovery mode
@@ -144,17 +143,13 @@ func (p *TuiCmd) SetFlags(f *flag.FlagSet) {
 
 // Execute execute
 func (p *TuiCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
-	c.Conf.Lang = "en"
-
-	// Setup Logger
 	util.Log = util.NewCustomLogger(c.ServerInfo{})
-	cvelog.SetLogger(c.Conf.LogDir, false, c.Conf.Debug, false)
-
 	if err := c.Load(p.configPath, ""); err != nil {
 		util.Log.Errorf("Error loading %s, err: %+v", p.configPath, err)
 		return subcommands.ExitUsageError
 	}
 
+	c.Conf.Lang = "en"
 	c.Conf.CveDict.Overwrite(p.cveDict)
 	c.Conf.OvalDict.Overwrite(p.ovalDict)
 	c.Conf.Gost.Overwrite(p.gostConf)
diff --git a/scan/executil.go b/scan/executil.go
index 9f695383..df215a92 100644
--- a/scan/executil.go
+++ b/scan/executil.go
@@ -333,7 +333,7 @@ func sshExecExternal(c conf.ServerInfo, cmd string, sudo bool) (result execResul
 
 func getSSHLogger(log ...*logrus.Entry) *logrus.Entry {
 	if len(log) == 0 {
-		return util.NewCustomLogger(conf.ServerInfo{})
+		return util.Log
 	}
 	return log[0]
 }
diff --git a/util/logutil.go b/util/logutil.go
index ef7abb82..f56591c9 100644
--- a/util/logutil.go
+++ b/util/logutil.go
@@ -34,6 +34,10 @@ func NewCustomLogger(c config.ServerInfo) *logrus.Entry {
 		log.Level = logrus.DebugLevel
 	}
 
+	if flag.Lookup("test.v") != nil {
+		return logrus.NewEntry(log)
+	}
+
 	// File output
 	logDir := GetDefaultLogDir()
 	if 0 < len(config.Conf.LogDir) {
@@ -52,6 +56,7 @@ func NewCustomLogger(c config.ServerInfo) *logrus.Entry {
 		if file, err := os.OpenFile(logFile, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644); err == nil {
 			log.Out = file
 		} else {
+			log.Out = os.Stderr
 			log.Errorf("Failed to create log file. path: %s, err: %s", logFile, err)
 		}
 	} else {
@@ -65,14 +70,18 @@ func NewCustomLogger(c config.ServerInfo) *logrus.Entry {
 
 	if _, err := os.Stat(logDir); err == nil {
 		path := filepath.Join(logDir, fmt.Sprintf("%s.log", whereami))
-		log.Hooks.Add(lfshook.NewHook(lfshook.PathMap{
-			logrus.DebugLevel: path,
-			logrus.InfoLevel:  path,
-			logrus.WarnLevel:  path,
-			logrus.ErrorLevel: path,
-			logrus.FatalLevel: path,
-			logrus.PanicLevel: path,
-		}, nil))
+		if _, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644); err == nil {
+			log.Hooks.Add(lfshook.NewHook(lfshook.PathMap{
+				logrus.DebugLevel: path,
+				logrus.InfoLevel:  path,
+				logrus.WarnLevel:  path,
+				logrus.ErrorLevel: path,
+				logrus.FatalLevel: path,
+				logrus.PanicLevel: path,
+			}, nil))
+		} else {
+			log.Errorf("Failed to create log file. path: %s, err: %s", path, err)
+		}
 	}
 
 	fields := logrus.Fields{"prefix": whereami}