Merge pull request #145 from DrBu7cher/improve-topologyspreadconstraints-templating

feat(coredns,helmchart): template topologySpreadConstraints

Author: hagaibarel

charts/coredns/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v2
 name: coredns
-version: 1.27.1
+version: 1.28.0
 appVersion: 1.11.1
 home: https://coredns.io
 icon: https://coredns.io/images/CoreDNS_Colour_Horizontal.png
@@ -20,5 +20,5 @@ engine: gotpl
 type: application
 annotations:
   artifacthub.io/changes: |
-    - kind: fixed
-      description: Fixed indentation for sidecar containers
+    - kind: added
+      description: topologySpreadConstraints can be templated values

charts/coredns/templates/deployment.yaml

@@ -73,7 +73,7 @@ spec:
       {{- end }}
       {{- if .Values.topologySpreadConstraints }}
       topologySpreadConstraints:
-{{ toYaml .Values.topologySpreadConstraints | indent 8 }}
+{{ tpl (toYaml .Values.topologySpreadConstraints) $ | indent 8 }}
       {{- end }}
       {{- if .Values.tolerations }}
       tolerations:

charts/coredns/values.yaml

@@ -181,14 +181,23 @@ readinessProbe:
 affinity: {}
 
 # expects input structure as per specification https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.21/#topologyspreadconstraint-v1-core
-# for example:
+# and supports Helm templating.
+# For example:
 #   topologySpreadConstraints:
-#   - maxSkew: 1
-#     topologyKey: zone
-#     whenUnsatisfiable: DoNotSchedule
-#     labelSelector:
-#       matchLabels:
-#         foo: bar
+#     - labelSelector:
+#         matchLabels:
+#           app.kubernetes.io/name: '{{ template "coredns.name" . }}'
+#           app.kubernetes.io/instance: '{{ .Release.Name }}'
+#       topologyKey: topology.kubernetes.io/zone
+#       maxSkew: 1
+#       whenUnsatisfiable: ScheduleAnyway
+#     - labelSelector:
+#         matchLabels:
+#           app.kubernetes.io/name: '{{ template "coredns.name" . }}'
+#           app.kubernetes.io/instance: '{{ .Release.Name }}'
+#       topologyKey: kubernetes.io/hostname
+#       maxSkew: 1
+#       whenUnsatisfiable: ScheduleAnyway
 topologySpreadConstraints: []
 
 # Node labels for pod assignment