[stable/nginx-ingress]: make pod dnsConfig configurable (#20175)

Signed-off-by: John Bryan Sazon <jb.sazon@24metrics.com>

stable/nginx-ingress/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: nginx-ingress
-version: 1.29.1
+version: 1.29.2
 appVersion: 0.27.0
 home: https://github.com/kubernetes/ingress-nginx
 description: An nginx Ingress controller that uses ConfigMap to store the nginx configuration.

stable/nginx-ingress/README.md

@@ -57,6 +57,7 @@ Parameter | Description | Default
 `controller.hostNetwork` | If the nginx deployment / daemonset should run on the host's network namespace. Do not set this when `controller.service.externalIPs` is set and `kube-proxy` is used as there will be a port-conflict for port `80` | false
 `controller.defaultBackendService` | default 404 backend service; needed only if `defaultBackend.enabled = false` | `""`
 `controller.dnsPolicy` | If using `hostNetwork=true`, change to `ClusterFirstWithHostNet`. See [pod's dns policy](https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-s-dns-policy) for details | `ClusterFirst`
+`controller.dnsConfig` | custom pod dnsConfig. See [pod's dns config](https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-s-dns-config) for details | `{}` 
 `controller.reportNodeInternalIp` | If using `hostNetwork=true`, setting `reportNodeInternalIp=true`, will pass the flag `report-node-internal-ip-address` to nginx-ingress. This sets the status of all Ingress objects to the internal IP address of all nodes running the NGINX Ingress controller.
 `controller.electionID` | election ID to use for the status update | `ingress-controller-leader`
 `controller.extraEnvs` | any additional environment variables to set in the pods | `{}`

stable/nginx-ingress/templates/controller-daemonset.yaml

@@ -38,6 +38,10 @@ spec:
 {{ toYaml .Values.controller.podLabels | indent 8}}
         {{- end }}
     spec:
+{{- if .Values.controller.dnsConfig }}
+      dnsConfig:
+{{ toYaml .Values.controller.dnsConfig | indent 8 }}
+{{- end }}
       dnsPolicy: {{ .Values.controller.dnsPolicy }}
       {{- if .Values.imagePullSecrets }}
       imagePullSecrets:

stable/nginx-ingress/templates/controller-deployment.yaml

@@ -39,6 +39,10 @@ spec:
 {{ toYaml .Values.controller.podLabels | indent 8 }}
         {{- end }}
     spec:
+{{- if .Values.controller.dnsConfig }}
+      dnsConfig:
+{{ toYaml .Values.controller.dnsConfig | indent 8 }}
+{{- end }}
       dnsPolicy: {{ .Values.controller.dnsPolicy }}
       {{- if .Values.imagePullSecrets }}
       imagePullSecrets:

stable/nginx-ingress/values.yaml

@@ -30,6 +30,9 @@ controller:
   # is merged
   hostNetwork: false
 
+  # Optionally customize the pod dnsConfig.
+  dnsConfig: {}
+
   # Optionally change this to ClusterFirstWithHostNet in case you have 'hostNetwork: true'.
   # By default, while using host network, name resolution uses the host's DNS. If you wish nginx-controller
   # to keep resolving names inside the k8s network, use ClusterFirstWithHostNet.