fix duplicate log for tunnel interface decision (#1823)

pkg/daemon/config.go

@@ -26,6 +26,8 @@ import (
 
 // Configuration is the daemon conf
 type Configuration struct {
+	// interface being used for tunnel
+	tunnelIface           string
 	Iface                 string
 	MTU                   int
 	MSS                   int
@@ -174,6 +176,9 @@ func (config *Configuration) initNicConfig(nicBridgeMappings map[string]string)
 			return fmt.Errorf("iface %s has no ip address", tunnelNic)
 		}
 		encapIP = strings.Split(addrs[0].String(), "/")[0]
+
+		klog.Infof("use %s as tunnel interface", iface.Name)
+		config.tunnelIface = iface.Name
 	}
 
 	if config.MTU == 0 {
@@ -207,7 +212,6 @@ func findInterface(ifaceStr string) (*net.Interface, error) {
 	}
 	for _, iface := range ifaces {
 		if ifaceRegex.MatchString(iface.Name) {
-			klog.Infof("use %s as tunnel interface", iface.Name)
 			return &iface, nil
 		}
 	}

pkg/daemon/controller.go

@@ -946,6 +946,10 @@ func (c *Controller) loopEncapIpCheck() {
 			klog.Errorf("iface %s has no ip address", nodeTunnelName)
 			return
 		}
+		if iface.Name != c.config.tunnelIface {
+			klog.Infof("use %s as tunnel interface", iface.Name)
+			c.config.tunnelIface = iface.Name
+		}
 
 		// if assigned iface in node annotation is down or with no ip, the error msg should be printed periodically
 		if c.config.Iface == nodeTunnelName {