diff --git a/pkg/core/udpovertcp.go b/pkg/core/udpovertcp.go
index f68eb181..4f6b6bcf 100644
--- a/pkg/core/udpovertcp.go
+++ b/pkg/core/udpovertcp.go
@@ -36,7 +36,8 @@ func readDatagramPacket(r io.Reader, b []byte) (*datagramPacket, error) {
 		return nil, err
 	}
 	dataLength := binary.BigEndian.Uint16(b[:2])
-	if _, err = io.ReadFull(r, b[:dataLength]); err != nil && (err != io.ErrUnexpectedEOF || err != io.EOF) {
+	_, err = io.ReadFull(r, b[:dataLength])
+	if err != nil && (err != io.ErrUnexpectedEOF || err != io.EOF) {
 		return nil, err
 	}
 	return &datagramPacket{DataLength: dataLength, Data: b[:dataLength]}, nil
diff --git a/pkg/handler/cleaner.go b/pkg/handler/cleaner.go
index e19cb8eb..f8464710 100644
--- a/pkg/handler/cleaner.go
+++ b/pkg/handler/cleaner.go
@@ -30,7 +30,8 @@ func (c *ConnectOptions) addCleanUpResourceHandler(clientset *kubernetes.Clients
 		<-stopChan
 		log.Info("prepare to exit, cleaning up")
 		dns.CancelDNS()
-		if err := c.dhcp.ReleaseIpToDHCP(c.usedIPs...); err != nil {
+		err := c.dhcp.ReleaseIpToDHCP(c.usedIPs...)
+		if err != nil {
 			log.Errorf("failed to release ip to dhcp, err: %v", err)
 		}
 		cancel()
@@ -54,28 +55,30 @@ func Cleanup(s os.Signal) {
 
 // vendor/k8s.io/kubectl/pkg/polymorphichelpers/rollback.go:99
 func updateServiceRefCount(serviceInterface v12.ServiceInterface, name string, increment int) {
-	if err := retry.OnError(retry.DefaultRetry, func(err error) bool {
-		return !k8serrors.IsNotFound(err)
-	}, func() error {
-		service, err := serviceInterface.Get(context.TODO(), name, v1.GetOptions{})
-		if err != nil {
-			log.Errorf("update ref-count failed, increment: %d, error: %v", increment, err)
+	err := retry.OnError(
+		retry.DefaultRetry,
+		func(err error) bool { return !k8serrors.IsNotFound(err) },
+		func() error {
+			service, err := serviceInterface.Get(context.TODO(), name, v1.GetOptions{})
+			if err != nil {
+				log.Errorf("update ref-count failed, increment: %d, error: %v", increment, err)
+				return err
+			}
+			curCount := 0
+			if ref := service.GetAnnotations()["ref-count"]; len(ref) > 0 {
+				curCount, err = strconv.Atoi(ref)
+			}
+			p, _ := json.Marshal([]interface{}{
+				map[string]interface{}{
+					"op":    "replace",
+					"path":  "/metadata/annotations/ref-count",
+					"value": strconv.Itoa(curCount + increment),
+				},
+			})
+			_, err = serviceInterface.Patch(context.TODO(), config.ConfigMapPodTrafficManager, types.JSONPatchType, p, v1.PatchOptions{})
 			return err
-		}
-		curCount := 0
-		if ref := service.GetAnnotations()["ref-count"]; len(ref) > 0 {
-			curCount, err = strconv.Atoi(ref)
-		}
-		p, _ := json.Marshal([]interface{}{
-			map[string]interface{}{
-				"op":    "replace",
-				"path":  "/metadata/annotations/ref-count",
-				"value": strconv.Itoa(curCount + increment),
-			},
 		})
-		_, err = serviceInterface.Patch(context.TODO(), config.ConfigMapPodTrafficManager, types.JSONPatchType, p, v1.PatchOptions{})
-		return err
-	}); err != nil {
+	if err != nil {
 		log.Errorf("update ref count error, error: %v", err)
 	} else {
 		log.Info("update ref count successfully")
diff --git a/pkg/handler/dhcp.go b/pkg/handler/dhcp.go
index 69e4fc5f..9f3a1b13 100644
--- a/pkg/handler/dhcp.go
+++ b/pkg/handler/dhcp.go
@@ -33,13 +33,13 @@ func NewDHCPManager(client corev1.ConfigMapInterface, namespace string, cidr *ne
 //	todo optimize dhcp, using mac address, ip and deadline as unit
 func (d *DHCPManager) InitDHCP() error {
 	configMap, err := d.client.Get(context.Background(), config.ConfigMapPodTrafficManager, metav1.GetOptions{})
-	if err == nil && configMap != nil {
+	if err == nil {
 		if _, found := configMap.Data[config.KeyEnvoy]; !found {
 			_, err = d.client.Patch(
 				context.Background(),
 				configMap.Name,
 				types.MergePatchType,
-				[]byte(fmt.Sprintf("{\"data\":{\"%s\":\"%s\"}}", config.KeyEnvoy, "")),
+				[]byte(fmt.Sprintf(`{"data":{"%s":"%s"}}`, config.KeyEnvoy, "")),
 				metav1.PatchOptions{},
 			)
 			return err
@@ -121,7 +121,8 @@ func (d *DHCPManager) updateDHCPConfigMap(f func(*ipallocator.Range) error) erro
 	if err != nil {
 		return err
 	}
-	if err = dhcp.Restore(d.cidr, []byte(cm.Data[config.KeyDHCP])); err != nil {
+	err = dhcp.Restore(d.cidr, []byte(cm.Data[config.KeyDHCP]))
+	if err != nil {
 		return err
 	}
 	if err = f(dhcp); err != nil {
diff --git a/pkg/handler/envoy.go b/pkg/handler/envoy.go
index 32440b66..72ac9a3e 100644
--- a/pkg/handler/envoy.go
+++ b/pkg/handler/envoy.go
@@ -77,22 +77,26 @@ func InjectVPNAndEnvoySidecar(factory cmdutil.Factory, clientset v12.ConfigMapIn
 	b, _ := json.Marshal(restorePatch)
 	mesh.AddMeshContainer(templateSpec, nodeID, c)
 	helper := pkgresource.NewHelper(object.Client, object.Mapping)
-	ps := []P{{
-		Op:    "replace",
-		Path:  "/" + strings.Join(append(path, "spec"), "/"),
-		Value: templateSpec.Spec,
-	}, {
-		Op:    "replace",
-		Path:  "/metadata/annotations/probe",
-		Value: b,
-	}}
+	ps := []P{
+		{
+			Op:    "replace",
+			Path:  "/" + strings.Join(append(path, "spec"), "/"),
+			Value: templateSpec.Spec,
+		},
+		{
+			Op:    "replace",
+			Path:  "/metadata/annotations/probe",
+			Value: b,
+		},
+	}
 	bytes, err := json.Marshal(append(ps, removePatch...))
 	if err != nil {
 		return err
 	}
 	_, err = helper.Patch(object.Namespace, object.Name, types.JSONPatchType, bytes, &metav1.PatchOptions{})
 	if err != nil {
-		log.Warnf("error while remove probe of resource: %s %s, ignore, err: %v", object.Mapping.GroupVersionKind.GroupKind().String(), object.Name, err)
+		log.Warnf("error while path resource: %s %s, err: %v", object.Mapping.GroupVersionKind.GroupKind().String(), object.Name, err)
+		return err
 	}
 
 	RollbackFuncList = append(RollbackFuncList, func() {
diff --git a/pkg/util/util.go b/pkg/util/util.go
index c5947dd7..255cec63 100644
--- a/pkg/util/util.go
+++ b/pkg/util/util.go
@@ -311,7 +311,8 @@ func Ping(targetIP string) (bool, error) {
 	if err != nil {
 		return false, nil
 	}
-	if _, err = conn.WriteTo(data, &net.IPAddr{IP: net.ParseIP(targetIP)}); err != nil {
+	_, err = conn.WriteTo(data, &net.IPAddr{IP: net.ParseIP(targetIP)})
+	if err != nil {
 		return false, err
 	}
 
@@ -486,7 +487,7 @@ func IsPortListening(port int) bool {
 	if err != nil {
 		return true
 	} else {
-		listener.Close()
+		_ = listener.Close()
 		return false
 	}
 }