chore: add dns config and dns policy settings support to deployment

templates/deployment.yml

@@ -210,7 +210,12 @@ spec:
         {{- if .Values.sidecars }}
         {{- include "common.tplvalues.render" (dict "value" .Values.sidecars "context" $) | nindent 8 }}
         {{- end }}
-      dnsPolicy: ClusterFirst
+      {{- if .Values.dnsConfig }}
+      dnsConfig: {{- include "common.tplvalues.render" (dict "value" .Values.dnsConfig "context" $) | nindent 12 }}
+      {{- end }}
+      {{- if .Values.dnsPolicy }}
+      dnsPolicy: {{ .Values.dnsPolicy | quote }}
+      {{- end }}
       {{- include "common.images.renderPullSecrets" (dict "images" (list .Values.image) "context" $) | nindent 6 }}
       volumes:
         - name: {{ .Release.Name }}-etc

tests/deployment_test.yaml

@@ -45,3 +45,46 @@ tests:
       - equal:
           path: spec.maxReplicas
           value: 5
+
+  - it: should omit dnsConfig by default
+    template: deployment.yml
+    asserts:
+      - notExists:
+          path: spec.template.spec.dnsConfig
+
+  - it: should render dnsConfig options when specified via values
+    template: deployment.yml
+    set:
+      dnsConfig:
+        options:
+          - name: ndots
+            value: "1"
+        searches:
+          - cluster.home.arpa
+          - home.arpa
+    asserts:
+      - equal:
+          path: spec.template.spec.dnsConfig
+          value:
+            options:
+              - name: ndots
+                value: "1"
+            searches:
+              - cluster.home.arpa
+              - home.arpa
+
+  - it: should render dnsPolicy by default
+    template: deployment.yml
+    asserts:
+      - equal:
+          path: spec.template.spec.dnsPolicy
+          value: ClusterFirst
+
+  - it: should render dnsPolicy when specified via values
+    template: deployment.yml
+    set:
+      dnsPolicy: ClusterFirstWithHostNet
+    asserts:
+      - equal:
+          path: spec.template.spec.dnsPolicy
+          value: ClusterFirstWithHostNet

values.yaml

@@ -281,6 +281,24 @@ disruptionBudget:
 ## @param environment [array] Extra env vars passed to the Stream pods
 environment: []
 
+## Pod's DNS Configuration
+## https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-dns-config
+## This value is useful if you need to resolve your custom domain for ACME challenges
+## Example:
+##  nameservers:
+##    - 1.2.3.4
+##  searches:
+##    - ns1.svc.cluster-domain.example
+##    - my.dns.search.suffix
+##  options:
+##    - name: ndots
+##      value: "2"
+dnsConfig: {}
+
+# Pod's DNS Policy
+# https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-s-dns-policy
+dnsPolicy: ClusterFirst
+
 ## @section Stream Service configuration
 ##
 service: