wildduck: Make sure Haraka, Wildduck and ZoneMTA are scheduled on same hosts for MetalLB

wildduck/zonemta.yaml

@@ -42,7 +42,7 @@ kind: Deployment
 metadata:
   name: zonemta
 spec:
-  replicas: 4
+  replicas: 2
   selector:
     matchLabels:
       app.kubernetes.io/name: wildduck
@@ -53,6 +53,33 @@ spec:
         app.kubernetes.io/name: wildduck
         app.kubernetes.io/component: zonemta
     spec:
+      affinity:
+        podAntiAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            - labelSelector:
+                matchExpressions:
+                  - key: app.kubernetes.io/name
+                    operator: In
+                    values:
+                      - wildduck
+                  - key: app.kubernetes.io/component
+                    operator: In
+                    values:
+                      - zonemta
+              topologyKey: topology.kubernetes.io/zone
+        podAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            - labelSelector:
+                matchExpressions:
+                  - key: app.kubernetes.io/name
+                    operator: In
+                    values:
+                      - wildduck
+                  - key: app.kubernetes.io/component
+                    operator: In
+                    values:
+                      - wildduck
+              topologyKey: kubernetes.io/hostname
       containers:
         - name: zonemta
           image: docker.io/codemowers/wildduck-zonemta-outbound:latest@sha256:0878c803164e636820398f11a3811f3d92b7771c6202cfe229f97449d0009119