How do I force Kubernetes CoreDNS to reload its Config Map after a change?
One way to apply Configmap changes would be to redeploy CoreDNS pods:
kubectl rollout restart -n kube-system deployment/coredns
You can edit it in command line:
kubectl edit cm coredns -n kube-system
Save it and exit, which should reload it.
If it will not reload, as Emruz Hossain advised delete coredns:
kubectl get pods -n kube-system -oname |grep coredns |xargs kubectl delete -n kube-system