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Code Block
languagebash
themeEmacs
kubectl -n kube-system edit configmap/coredns

On OpenShift:



kubectl -n openshift-dns edit configmaps/dns-default
Code Block
languagebash
themeEmacs
Code Block
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 test.com {
            1.2.3.4 example.com
            6.6.6.6 test.com
            fallthrough
        }
    }

...

Code Block
languagebash
themeEmacs
kubectl delete pod --namespace kube-system -l k8s-app=kube-dns

On Openshift

Code Block
languagebash
themeEmacs
kubectl -n openshift-dns delete pod -l dns.operator.openshift.io/daemonset-dns=default


Performing an nslookup from a pod should show the new IP address for example.com

Code Block
root@ssh-server-5bd5774cf7-fgvt4:/# nslookup example.com
Server:		10.96.0.10
Address:	10.96.0.10#53

Name:	example.com
Address: 1.2.3.4


OpenShift

See https://access.redhat.com/solutions/7070905

References