diff --git a/pkg/transformer/kubernetes/k8sutils.go b/pkg/transformer/kubernetes/k8sutils.go
index 3edd9de7..0ff96cd2 100644
--- a/pkg/transformer/kubernetes/k8sutils.go
+++ b/pkg/transformer/kubernetes/k8sutils.go
@@ -183,7 +183,9 @@ func PrintList(objects []runtime.Object, opt kobject.ConvertOptions) error {
 		if err != nil {
 			return errors.Wrap(err, "transformer.CreateOutFile failed")
 		}
-		log.Printf("Kubernetes file %q created", opt.OutFile)
+		if len(opt.OutFile) != 0 {
+			log.Printf("Kubernetes file %q created", opt.OutFile)
+		}
 		defer f.Close()
 	}
 
@@ -832,3 +834,8 @@ func FormatContainerName(name string) string {
 	name = strings.Replace(name, "_", "-", -1)
 	return name
 }
+
+// FormatResourceName generate a valid k8s resource name
+func FormatResourceName(name string) string {
+	return strings.ToLower(strings.Replace(name, "_", "-", -1))
+}
diff --git a/pkg/transformer/kubernetes/kubernetes.go b/pkg/transformer/kubernetes/kubernetes.go
index 3bf1d3f9..faf7224b 100644
--- a/pkg/transformer/kubernetes/kubernetes.go
+++ b/pkg/transformer/kubernetes/kubernetes.go
@@ -482,7 +482,7 @@ func (k *Kubernetes) CreateSecrets(komposeObject kobject.KomposeObject) ([]*api.
 					APIVersion: "v1",
 				},
 				ObjectMeta: metav1.ObjectMeta{
-					Name:   name,
+					Name:   FormatResourceName(name),
 					Labels: transformer.ConfigLabels(name),
 				},
 				Type: api.SecretTypeOpaque,