apiVersion: v1
kind: ConfigMap
metadata:
name: coredns-custom
namespace: kube-system
data:
example.server: | # All custom server files must have a ".server" file extension.
# Change example.com to the domain you wish to forward.
example.com {
# Change 1.1.1.1 to your customer DNS resolver.
forward . 1.1.1.1
}
Create the ConfigMap by entering:
kubectl apply -f <filename>.yaml
Verify the customizations have been applied by entering:
kubectl get configmaps --namespace=kube-system coredns-custom -o yaml
Force CoreDNS to reload the ConfigMap by entering:
kubectl delete pod --namespace kube-system -l k8s-app=kube-dns
References
| Reference | URL |
|---|---|
| Configuring DNS Servers for Kubernetes Clusters | https://docs.oracle.com/en-us/iaas/Content/ContEng/Tasks/contengconfiguringdnsserver.htm |
| Customizing DNS Service | https://kubernetes.io/docs/tasks/administer-cluster/dns-custom-nameservers/ |
| Debugging DNS Resolution | https://kubernetes.io/docs/tasks/administer-cluster/dns-debugging-resolution/ |