Coredns affinity tolerations (#7039)

* added 'affinity' and 'tolerations' configuration hooks to coredns

* bumped up version. No breaking changes hence the minor version increase.

* Update Chart.yaml

stable/coredns/Chart.yaml

@@ -1,5 +1,5 @@
 name: coredns
-version: 0.9.0
+version: 0.9.1
 appVersion: 1.0.6
 description: CoreDNS is a DNS server that chains plugins and provides Kubernetes DNS Services
 keywords:
@@ -13,5 +13,5 @@ sources:
 maintainers:
 - name: Acaleph
   email: hello@acale.ph
-- name: Shashidhara TD
+- name: shashidharatd
   email: shashidhara.huawei@gmail.com

stable/coredns/templates/deployment.yaml

@@ -43,6 +43,14 @@ spec:
       {{- end }}
       {{- if .Values.isClusterService }}
       dnsPolicy: Default
+      {{- end }}
+      {{- if .Values.affinity }}
+      affinity:
+{{ toYaml .Values.affinity | indent 8 }}
+      {{- end }}
+      {{- if .Values.tolerations }}
+      tolerations:
+{{ toYaml .Values.tolerations | indent 8 }}
       {{- end }}
       containers:
       - name: "coredns"

stable/coredns/values.yaml

@@ -36,6 +36,28 @@ serviceType: "ClusterIP"
 # Can be one of three options: "UDPNTCP" (default), "UDP" or "TCP"
 serviceProtocol: "UDPNTCP"
 
+# expects input structure as per specification https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.11/#affinity-v1-core
+# for example:
+#   affinity:
+#     nodeAffinity:
+#      requiredDuringSchedulingIgnoredDuringExecution:
+#        nodeSelectorTerms:
+#        - matchExpressions:
+#          - key: foo.bar.com/role
+#            operator: In
+#            values:
+#            - master
+affinity: {}
+
+# expects input structure as per specification https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.11/#toleration-v1-core
+# for example:
+#   tolerations:
+#   - key: foo.bar.com/role
+#     operator: Equal
+#     value: master
+#     effect: NoSchedule
+tolerations: []
+
 # plugn configuration of CoreDNS refer to https://github.com/coredns/coredns/tree/master/plugin
 # for all specific details. set enabled to true/false to enable/disable a plugin.
 plugins: