Implement podAntiAffinity for postfix

charts/postfix/v0.1.0/templates/deployment.yaml

@@ -63,10 +63,20 @@ spec:
       nodeSelector:
         {{- toYaml . | nindent 8 }}
       {{- end }}
-      {{- with .Values.affinity }}
       affinity:
-        {{- toYaml . | nindent 8 }}
-      {{- end }}
+        podAntiAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+            - labelSelector:
+                matchExpressions:
+                  - key: app.kubernetes.io/name
+                    operator: In
+                    values:
+                      - {{ include "postfix.name" . }}
+                  - key: app.kubernetes.io/instance
+                    operator: In
+                    values:
+                      - {{ .Release.Name }}
+              topologyKey: "kubernetes.io/hostname"
       {{- with .Values.tolerations }}
       tolerations:
         {{- toYaml . | nindent 8 }}