We are going to be adding a host alias for example.com in this example by adding the following to the coredns configmap:
hosts custom.hosts example.com { 1.2.3.4 example.com fallthrough }
Start by editing the coredns configmap:
kubectl -n kube-system edit configmap/coredns
apiVersion: v1 data: Corefile: | .:53 { errors health { lameduck 5s } ready kubernetes cluster.local in-addr.arpa ip6.arpa { pods insecure fallthrough in-addr.arpa ip6.arpa ttl 30 } prometheus :9153 forward . /etc/resolv.conf { max_concurrent 1000 } cache 30 loop reload loadbalance hosts custom.hosts example.com { 1.2.3.4 example.com fallthrough } }
Force CoreDNS to reload the ConfigMap by entering:
kubectl delete pod --namespace kube-system -l k8s-app=kube-dns
References
Reference | URL |
---|---|
** Add a Custom Host to Kubernetes | https://hjrocha.medium.com/add-a-custom-host-to-kubernetes-a06472cedccb |
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/ |
Custom DNS Entries For Kubernetes | https://coredns.io/2017/05/08/custom-dns-entries-for-kubernetes/ |