feat: add support for coredns_affinity (#11994)

Signed-off-by: Ho Kim <ho.kim@ulagbulag.io>
Co-authored-by: ChengHao Yang <17496418+tico88612@users.noreply.github.com>

roles/kubernetes-apps/ansible/defaults/main.yml

@@ -13,6 +13,17 @@ dns_prevent_single_point_failure: "{{ 'true' if dns_min_replicas | int > 1 else
 enable_coredns_reverse_dns_lookups: true
 coredns_ordinal_suffix: ""
 # dns_extra_tolerations: [{effect: NoSchedule, operator: "Exists"}]
+coredns_affinity:
+  podAntiAffinity:
+    preferredDuringSchedulingIgnoredDuringExecution:
+    - weight: 100
+      podAffinityTerm:
+        labelSelector:
+          matchExpressions:
+          - key: k8s-app
+            operator: In
+            values: ["kube-dns"]
+        topologyKey: kubernetes.io/hostname
 coredns_deployment_nodeselector: "kubernetes.io/os: linux"
 coredns_default_zone_cache_block: |
   cache 30

roles/kubernetes-apps/ansible/templates/coredns-deployment.yml.j2

@@ -38,21 +38,7 @@ spec:
         {{ dns_extra_tolerations | list | to_nice_yaml(indent=2) | indent(8) }}
 {% endif %}
       affinity:
-        podAntiAffinity:
-          requiredDuringSchedulingIgnoredDuringExecution:
-          - topologyKey: "kubernetes.io/hostname"
-            labelSelector:
-              matchLabels:
-                k8s-app: kube-dns{{ coredns_ordinal_suffix }}
-        nodeAffinity:
-          preferredDuringSchedulingIgnoredDuringExecution:
-          - weight: 100
-            preference:
-              matchExpressions:
-              - key: node-role.kubernetes.io/control-plane
-                operator: In
-                values:
-                - ""
+        {{ coredns_affinity | to_nice_yaml(indent=2) | indent(8) }}
       containers:
       - name: coredns
         image: "{{ coredns_image_repo }}:{{ coredns_image_tag }}"