[worker] retry registration

worker/worker.go

@@ -402,8 +402,17 @@ func (w *Worker) registorWorker() {
 	for _, root := range w.cfg.Manager.APIBaseList() {
 		url := fmt.Sprintf("%s/workers", root)
 		logger.Debugf("register on manager url: %s", url)
-		if _, err := PostJSON(url, msg, w.httpClient); err != nil {
-			logger.Errorf("Failed to register worker")
+		for retry := 10; retry > 0; {
+			if _, err := PostJSON(url, msg, w.httpClient); err != nil {
+				logger.Errorf("Failed to register worker")
+				retry--
+				if retry > 0 {
+					time.Sleep(1 * time.Second)
+					logger.Noticef("Retrying... (%d)", retry)
+				}
+			} else {
+				break
+			}
 		}
 	}
 }