Restore support for single port services, document multi-port support

README.md

@@ -37,6 +37,28 @@ exposed as an mDNS service.
 If a service is deleted or updated to not be exposed, the daemon will remove
 the mDNS service.
 
+## Kubernetes services with multiple ports
+
+If a service has multiple ports, the port to be exposed as an mDNS service
+has to be annotated with the same name as the mDNS service name, e.g.:
+
+```yaml
+metadata:
+  annotations:
+    kubelish/service-name: Example
+    kubelish/service-type: _example._tcp
+    kubelish/txt: Optional TXT record to be exposed along with the service on mDNS
+    ...
+spec:
+  ...
+  ports:
+  - name: Example
+    nodePort: 10000
+    port: 9090
+    protocol: TCP
+    targetPort: 9090
+```
+
 ## Running the daemon
 
 The daemon must be run natively on a node of the cluster, outside of Kubernetes.

pkg/k8s-watcher/watcher.go

@@ -57,13 +57,21 @@ func (w *Watcher) meshDetails(svc *corev1.Service) *ServiceMDNS {
 		}
 	}
 
-	for _, port := range svc.Spec.Ports {
-		if port.Name == service.Annotations.ServiceName {
-			service.Port = int(port.Port)
-			break
+	if len(svc.Spec.Ports) == 1 {
+		service.Port = int(svc.Spec.Ports[0].Port)
+	} else {
+		for _, port := range svc.Spec.Ports {
+			if port.Name == service.Annotations.ServiceName {
+				service.Port = int(port.Port)
+				break
+			}
 		}
 	}
 
+	if service.Port == 0 {
+		return nil
+	}
+
 	return service
 }