Merge pull request #4060 from LiilyZhang/zhangl/Issue4058

Issue #4058 - Bug: k8s mms doesn't work after auto upgrad…

resource/certificate.go

@@ -25,6 +25,7 @@ const (
 	daysValidFor = 500
 )
 
+// Create ESS Cert file and key file if not exist
 func CreateCertificate(org string, keyPath string, certPath string) error {
 
 	// get message printer, this function is called by CLI
@@ -33,6 +34,11 @@ func CreateCertificate(org string, keyPath string, certPath string) error {
 	common.Configuration.ServerCertificate = path.Join(certPath, config.HZN_FSS_CERT_FILE)
 	common.Configuration.ServerKey = path.Join(keyPath, config.HZN_FSS_CERT_KEY_FILE)
 
+	if fileExists(common.Configuration.ServerCertificate) && fileExists(common.Configuration.ServerKey) {
+		glog.V(3).Infof(reslog(fmt.Sprintf("ESS self signed cert and key already exist in %v, %v, skip creating...", common.Configuration.ServerCertificate, common.Configuration.ServerKey)))
+		return nil
+	}
+
 	glog.V(5).Infof(reslog(fmt.Sprintf("creating self signed cert in %v", common.Configuration.ServerCertificate)))
 
 	if err := os.MkdirAll(certPath, 0755); err != nil {
@@ -111,3 +117,16 @@ func CreateCertificate(org string, keyPath string, certPath string) error {
 
 	return nil
 }
+
+// This function checks if file exits or not
+func fileExists(filename string) bool {
+	fileinfo, err := os.Stat(filename)
+	if os.IsNotExist(err) {
+		return false
+	}
+	if fileinfo.IsDir() {
+		return false
+	}
+
+	return true
+}