add back anti-affinity

Author: rajansandeep

cluster/addons/dns/coredns/coredns.yaml.base

@@ -111,6 +111,17 @@ spec:
     spec:
       priorityClassName: system-cluster-critical
       serviceAccountName: coredns
+      affinity:
+        podAntiAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 100
+            podAffinityTerm:
+              labelSelector:
+                matchExpressions:
+                  - key: k8s-app
+                    operator: In
+                    values: ["kube-dns"]
+              topologyKey: kubernetes.io/hostname
       tolerations:
         - key: "CriticalAddonsOnly"
           operator: "Exists"

cluster/addons/dns/coredns/coredns.yaml.in

@@ -111,6 +111,17 @@ spec:
     spec:
       priorityClassName: system-cluster-critical
       serviceAccountName: coredns
+      affinity:
+        podAntiAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 100
+            podAffinityTerm:
+              labelSelector:
+                matchExpressions:
+                  - key: k8s-app
+                    operator: In
+                    values: ["kube-dns"]
+              topologyKey: kubernetes.io/hostname
       tolerations:
         - key: "CriticalAddonsOnly"
           operator: "Exists"

cluster/addons/dns/coredns/coredns.yaml.sed

@@ -111,6 +111,17 @@ spec:
     spec:
       priorityClassName: system-cluster-critical
       serviceAccountName: coredns
+      affinity:
+        podAntiAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 100
+            podAffinityTerm:
+              labelSelector:
+                matchExpressions:
+                  - key: k8s-app
+                    operator: In
+                    values: ["kube-dns"]
+              topologyKey: kubernetes.io/hostname
       tolerations:
         - key: "CriticalAddonsOnly"
           operator: "Exists"