Customize leader-election config map error checks

cmd/nginx-ingress/main.go

@@ -27,6 +27,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	api_v1 "k8s.io/api/core/v1"
 	meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/validation"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/kubernetes/scheme"
 	"k8s.io/client-go/rest"
@@ -137,6 +138,11 @@ func main() {
 		os.Exit(0)
 	}
 
+	statusLockNameValidationError := validateResourceName(*leaderElectionLockName)
+	if statusLockNameValidationError != nil {
+		glog.Fatalf("Invalid value for leader-election-lock-name: %v", statusLockNameValidationError)
+	}
+
 	statusPortValidationError := validatePort(*nginxStatusPort)
 	if statusPortValidationError != nil {
 		glog.Fatalf("Invalid value for nginx-status-port: %v", statusPortValidationError)
@@ -445,6 +451,15 @@ func getSocketClient(sockPath string) *http.Client {
 	}
 }
 
+// validateResourceName validates the name of a resource
+func validateResourceName(lock string) error {
+	allErrs := validation.IsDNS1123Subdomain(lock)
+	if len(allErrs) > 0 {
+		return fmt.Errorf("invalid resource name %v: %v", lock, allErrs)
+	}
+	return nil
+}
+
 // validatePort makes sure a given port is inside the valid port range for its usage
 func validatePort(port int) error {
 	if port < 1023 || port > 65535 {