Adding pod anti-affinity to the deployment manifest. (#52)

kubernetes/coredns.yaml.sed

@@ -86,6 +86,18 @@ spec:
           effect: NoSchedule
         - key: "CriticalAddonsOnly"
           operator: "Exists"
+      affinity:
+        podAntiAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 100
+            podAffinityTerm:
+              labelSelector:
+                matchExpressions:
+                - key: k8s-app
+                  operator: In
+                  values:
+                  - coredns
+              topologyKey: kubernetes.io/hostname
       containers:
       - name: coredns
         image: coredns/coredns:1.0.3