allow for dnsConfig directive (#571)

* allow for dnsConfig directive

* 📝 readme

Author: danquack

config/helm/aws-node-termination-handler/README.md

@@ -133,6 +133,7 @@ The configuration in this table applies to AWS Node Termination Handler in IMDS
 | `podMonitor.sampleLimit`         | Number of scraped samples accepted.                                                                                                                                                                                                                           | `5000`                 |
 | `useHostNetwork`                 | If `true`, enables `hostNetwork` for the Linux DaemonSet. NOTE: setting this to `false` may cause issues accessing IMDSv2 if your account is not configured with an IP hop count of 2 see [Metrics Endpoint Considerations](#metrics-endpoint-considerations) | `true`                 |
 | `dnsPolicy`                      | If specified, this overrides `linuxDnsPolicy` and `windowsDnsPolicy` with a single policy.                                                                                                                                                                    | `""`                   |
+| `dnsConfig`                      | If specified, this sets the dnsConfig: https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-dns-config                                                                                                                                                                    | `{}`                   |
 | `linuxDnsPolicy`                 | DNS policy for the Linux DaemonSet.                                                                                                                                                                                                                           | `""`                   |
 | `windowsDnsPolicy`               | DNS policy for the Windows DaemonSet.                                                                                                                                                                                                                         | `""`                   |
 | `daemonsetNodeSelector`          | Expressions to select a node by it's labels for DaemonSet pod assignment. For backwards compatibility the `nodeSelector` value has priority over this but shouldn't be used.                                                                                  | `{}`                   |

config/helm/aws-node-termination-handler/templates/daemonset.linux.yaml

@@ -45,6 +45,10 @@ spec:
       {{- end }}
       hostNetwork: {{ .Values.useHostNetwork }}
       dnsPolicy: {{ default .Values.linuxDnsPolicy .Values.dnsPolicy }}
+      {{- if .Values.dnsConfig }}
+      dnsConfig:
+        {{- toYaml . | nindent 10 }}
+      {{- end }}
       containers:
         - name: aws-node-termination-handler
           {{- with .Values.securityContext }}

config/helm/aws-node-termination-handler/templates/daemonset.windows.yaml

@@ -45,6 +45,10 @@ spec:
       {{- end }}
       hostNetwork: false
       dnsPolicy: {{ default .Values.windowsDnsPolicy .Values.dnsPolicy }}
+      {{- if .Values.dnsConfig }}
+      dnsConfig:
+        {{- toYaml . | nindent 10 }}
+      {{- end }}
       containers:
         - name: aws-node-termination-handler
           {{- with .Values.securityContext }}

config/helm/aws-node-termination-handler/templates/deployment.yaml

@@ -42,6 +42,10 @@ spec:
       {{- with .Values.terminationGracePeriodSeconds }}
       terminationGracePeriodSeconds: {{ . }}
       {{- end }}
+      {{- if .Values.dnsConfig }}
+      dnsConfig:
+        {{- toYaml . | nindent 10 }}
+      {{- end }}
       containers:
         - name: aws-node-termination-handler
           {{- with .Values.securityContext }}

config/helm/aws-node-termination-handler/values.yaml

@@ -219,6 +219,7 @@ useHostNetwork: true
 
 # Daemonset DNS policy
 dnsPolicy: ""
+dnsConfig: {}
 linuxDnsPolicy: ClusterFirstWithHostNet
 windowsDnsPolicy: ClusterFirst