feat(chart): support configuring dnsConfig

Signed-off-by: Stevo Slavic <[email protected]>

Author: sslavic

helm/aws-load-balancer-controller/README.md

@@ -249,6 +249,7 @@ The default values set by the application itself can be confirmed [here](https:/
 | `envFrom`                                       | Environment variables to set for aws-load-balancer-controller pod from configMap or Secret                                                                                                                            | None                                              |
 | `envSecretName`                                | AWS credentials as environment variables from Secret (Secret keys `key_id` and `access_key`).                                                                                                                         | None                                              |
 | `hostNetwork`                                  | If `true`, use hostNetwork                                                                                                                                                                                            | `false`                                           |
+| `dnsConfig`                                    | Set dnsConfig if required                                                                                                                                                                                             | `{}`                                              |
 | `dnsPolicy`                                    | Set dnsPolicy if required                                                                                                                                                                                             | `ClusterFirst`                                    |
 | `extraVolumeMounts`                            | Extra volume mounts for the pod                                                                                                                                                                                       | `[]`                                              |
 | `extraVolumes`                                 | Extra volumes for the pod                                                                                                                                                                                             | `[]`                                              |

helm/aws-load-balancer-controller/templates/deployment.yaml

@@ -58,6 +58,10 @@ spec:
       {{- if .Values.hostNetwork }}
       hostNetwork: true
       {{- end }}
+      {{- with .Values.dnsConfig }}
+      dnsConfig:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       {{- if .Values.dnsPolicy }}
       dnsPolicy: {{ .Values.dnsPolicy }}
       {{- end }}

helm/aws-load-balancer-controller/test.yaml

@@ -243,6 +243,23 @@ env:
 # recommended if using the Amazon VPC CNI plugin.
 hostNetwork: false
 
+# Specifies the dnsConfig that should be used for pods in the deployment
+#
+# Tuning dnsConfig specifically ndots may be used to reduce unnecessary DNS query expansion over search domains,
+# e.g. reduce ndots to avoid having requests for EC2 `ec2.eu-west-2.amazonaws.com` with default ndots of 5 get expanded to
+# `ec2.eu-west-2.amazonaws.com.eu-west-2.compute.internal`.
+# See https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-dns-config
+dnsConfig: {}
+  # nameservers:
+  #   - 1.2.3.4
+  # searches:
+  #   - ns1.svc.cluster-domain.example
+  #   - my.dns.search.suffix
+  # options:
+  #   - name: ndots
+  #     value: "2"
+  #   - name: edns0
+
 # Specifies the dnsPolicy that should be used for pods in the deployment
 #
 # This may need to be used to be changed given certain conditions. For instance, if one uses the cilium CNI

helm/aws-load-balancer-controller/values.yaml

@@ -308,6 +308,20 @@ env:
 # recommended if using the Amazon VPC CNI plugin.
 hostNetwork: false
 
+# Specifies the dnsConfig that should be used for pods in the deployment
+#
+# See https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-dns-config
+dnsConfig: {}
+  # nameservers:
+  #   - 1.2.3.4
+  # searches:
+  #   - ns1.svc.cluster-domain.example
+  #   - my.dns.search.suffix
+  # options:
+  #   - name: ndots
+  #     value: "2"
+  #   - name: edns0
+
 # Specifies the dnsPolicy that should be used for pods in the deployment
 #
 # This may need to be used to be changed given certain conditions. For instance, if one uses the cilium CNI