diff --git a/log.go b/log.go
index 9a43d53..2a4867f 100644
--- a/log.go
+++ b/log.go
@@ -29,7 +29,6 @@ const (
 var (
 	golog        *log.Logger        = nil
 	mylog        *Logger            = nil
-	logWriter    *cacheWriter       = nil
 	logidCreator LogidCreator       = nil
 	modulelogs   map[string]*Logger = map[string]*Logger{}
 )
@@ -176,6 +175,15 @@ func (log *Logger) logwrite(typ logLevel, calldepth int, format string, v ...int
 	}
 }
 
+func needWriteLogToFile() bool {
+	if cls, ok := os.LookupEnv("QOOLOG_CLOSE_FILELOG"); ok && cls != "N" && cls != "n" {
+		return false
+	} else if ink8s, ok := os.LookupEnv("KUBERNETES_PORT"); ok && ink8s != "" {
+		return false
+	}
+	return true
+}
+
 // //////////////////////////////////////////////////////////////////////////////////
 // ///////////////////////Initialize/////////////////////////////////////////////////
 // //////////////////////////////////////////////////////////////////////////////////
@@ -199,17 +207,18 @@ func initlog() {
 	)
 
 	// Step 2. init golog(golang std logger) & mylog(myself defined logger)
-	logWriter = NewCacheWriter(baseWriter)
-	golog = log.New(logWriter, "", gologFlags)
+	golog = log.New(NewCacheWriter(baseWriter), "", gologFlags)
 	mylog = New("system")
-	baseWriter.OpenLogFile(logDir, logName, logDirsOptional)
 
-	// Step 3. backgroud split log (log rotate)
-	go func() {
-		for {
-			tag := time.Now().Local().Format(logSplitTag)
-			baseWriter.TryBackupLogFile(tag)
-			time.Sleep(2 * time.Minute)
-		}
-	}()
+	// Step 3. backgroud split log (log rotate) if need
+	if needWriteLogToFile() {
+		go func() {
+			baseWriter.OpenLogFile(logDir, logName, logDirsOptional)
+			for {
+				tag := time.Now().Local().Format(logSplitTag)
+				baseWriter.TryBackupLogFile(tag)
+				time.Sleep(2 * time.Minute)
+			}
+		}()
+	}
 }