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K8s DNS Troubleshooting - Revision history
2026-06-02T04:30:19Z
Revision history for this page on the wiki
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https://tech.uvoo.io/index.php?title=K8s_DNS_Troubleshooting&diff=2303&oldid=prev
Busk: Created page with " kubectl apply -f testpod-dnsutils.yaml kubectl exec -i -t dnsutils -- nslookup cisco.com 10.x.x.x kubectl exec -i -t dnsutils -- nslookup cisco.com kubectl logs -n 10..."
2021-10-14T14:52:11Z
<p>Created page with " kubectl apply -f testpod-dnsutils.yaml kubectl exec -i -t dnsutils -- nslookup cisco.com 10.x.x.x kubectl exec -i -t dnsutils -- nslookup cisco.com kubectl logs -n 10..."</p>
<p><b>New page</b></p><div> kubectl apply -f testpod-dnsutils.yaml<br />
kubectl exec -i -t dnsutils -- nslookup cisco.com 10.x.x.x<br />
kubectl exec -i -t dnsutils -- nslookup cisco.com<br />
kubectl logs -n 10 --namespace=kube-system -l k8s-app=kube-dns<br />
kubectl describe cm -n kube-system -l k8s-app=kube-dns<br />
kubectl get configmap coredns -n kube-system -o yaml >tmp_coredns.yaml<br />
kubectl get ep kube-dns --namespace=kube-system<br />
kubectl -n kube-system rollout restart deployment coredns<br />
kubectl -n kube-system get configmap coredns<br />
kubectl rollout restart -n kube-system deployment/coredns<br />
k get pods -o wide --all-namespaces | grep "core\|dnsu"<br />
kubectl create deployment dnsutils --image=gcr.io/kubernetes-e2e-test-images/dnsutils:1.3 -- sleep 3600<br />
<br />
sudo microk8s enable ingress dns:10.206.232.247<br />
kubectl -n kube-system get configmap coredns -oyaml<br />
kubectl get pods -o wide --all-namespaces | grep "core\|dnsu"<br />
kubectl run dnsutils -n default --image=gcr.io/kubernetes-e2e-test-images/dnsutils:1.3 -- sleep 3600<br />
kubectl -n default exec -i -t dnsutils -- nslookup cisco.com 10.x.x.x<br />
kubectl -n default exec -i -t dnsutils -- nslookup cisco.com 10.152.183.10<br />
kubectl -n default exec -i -t dnsutils -- nslookup cisco.com<br />
curl -kH "Host: monitor.mktp.io" https://10.x.x.x<br />
<br />
kubectl -n default delete pod dnsutils<br />
sudo tcpdump -vvni any port 4789<br />
for i in {1..3}; do kubectl -n default exec -i -t dnsutils$i -- nslookup cisco.com; done<br />
<br />
for i in {1..3}; do<br />
echo "dnsutils$i"<br />
kubectl -n default run dnsutils$i --image=gcr.io/kubernetes-e2e-test-images/dnsutils:1.3 -- sleep 3600<br />
sleep 20<br />
kubectl -n default exec -i -t dnsutils$i -- nslookup cisco.com<br />
done</div>
Busk