migrate NATS to StatefulSet for clustering support

k8s/nats.yaml

@@ -1,10 +1,39 @@
-apiVersion: apps/v1
+apiVersion: v1
-kind: Deployment
+kind: Service
+metadata:
+  name: nats-headless
+  labels:
+    app: nats
+spec:
+  ports:
+    - port: 6222
+      name: cluster
+  clusterIP: None  #
+  selector:
+    app: nats
+---
+apiVersion: v1
+kind: Service
 metadata:
   name: nats
   labels:
     app: nats
 spec:
+  ports:
+    - port: 4222
+      name: client
+  selector:
+    app: nats
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: nats
+  labels:
+    app: nats
+spec:
+  serviceName: "nats-headless"
+  replicas: 3
   selector:
     matchLabels:
       app: nats
@@ -16,8 +45,18 @@ spec:
       containers:
         - name: nats
           image: nats:alpine
+          # Start-Befehl für Clustering
+          command:
+            - "nats-server"
+            - "--cluster"
+            - "nats://0.0.0.0:6222"
+            - "--routes"
+            - "nats://nats-headless:6222" # Route zeigt auf den Headless Service
           ports:
             - containerPort: 4222
+              name: client
+            - containerPort: 6222
+              name: cluster
           resources:
             requests:
               memory: "64Mi"
@@ -25,13 +64,3 @@ spec:
             limits:
               memory: "256Mi"
               cpu: "500m"
----
-apiVersion: v1
-kind: Service
-metadata:
-  name: nats
-spec:
-  ports:
-    - port: 4222
-  selector:
-    app: nats