feat: Adding CoreDNS Helm Chart

Author: kahirokunn

add-ons/coredns/Chart.yaml

@@ -0,0 +1,17 @@
+apiVersion: v2
+name: coredns
+description: A Helm chart for installing the CoreDNS
+type: application
+
+# The chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+version: 0.1.0
+
+# Version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application.
+appVersion: "1.0"
+
+dependencies:
+- name: coredns
+  version: 1.19.7
+  repository: https://coredns.github.io/helm

add-ons/coredns/values.yaml

@@ -0,0 +1,20 @@
+coredns:
+  k8sAppLabelOverride: kube-dns
+  priorityClassName: system-cluster-critical
+  serviceAccount:
+    create: false
+  replicaCount: 3
+  podDisruptionBudget:
+    maxUnavailable: 1
+  affinity:
+    podAntiAffinity:
+      preferredDuringSchedulingIgnoredDuringExecution:
+      - weight: 100
+        podAffinityTerm:
+          labelSelector:
+            matchExpressions:
+            - key: k8s-app
+              operator: In
+              values:
+              - coredns
+          topologyKey: "topology.kubernetes.io/zone"

chart/templates/coredns.yaml

@@ -0,0 +1,31 @@
+{{- if and (.Values.coredns) (.Values.coredns.enable) -}}
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: coredns
+  namespace: argocd
+  finalizers:
+  - resources-finalizer.argocd.argoproj.io
+spec:
+  project: default
+  source:
+    repoURL: {{ .Values.repoUrl }}
+    path: add-ons/coredns
+    targetRevision: {{ .Values.targetRevision }}
+    helm:
+      values: |
+        coredns:
+        {{- toYaml .Values.coredns | nindent 10 }}
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: kube-system
+  syncPolicy:
+    automated:
+      prune: true
+    retry:
+      limit: 1
+      backoff:
+        duration: 5s
+        factor: 2
+        maxDuration: 1m
+{{- end -}}

chart/values.yaml

@@ -59,7 +59,7 @@ certManagerCsiDriver:
 clusterAutoscaler:
   enable: false
   serviceAccountName:
-    
+
 # Datadog Operator
 datadogOperator:
   enable: false
@@ -214,10 +214,13 @@ policies:
 
 reporter:
   enable: false
-  
+
 # NVIDIA Device Plugin Values
 nvidiaDevicePlugin:
   enable: false
 
 velero:
-  enable: false
+  enable: false
+
+coredns:
+  enable: false