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Update docs to clarify the dns configmap format. (#29988) 

* Update docs to clarify the dns configmap format.

* Update content/en/docs/tasks/administer-cluster/nodelocaldns.md

Co-authored-by: Qiming Teng <tengqm@outlook.com>

Co-authored-by: Qiming Teng <tengqm@outlook.com>
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prameshj 2021-12-05 17:28:32 -08:00 committed by GitHub
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content/en/docs/tasks/administer-cluster/nodelocaldns.md
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@ -92,3 +92,12 @@ Once enabled, node-local-dns Pods will run in the kube-system namespace on each
You can disable this feature by removing the DaemonSet, using `kubectl delete -f <manifest>` . You should also revert any changes you made to the kubelet configuration.
## StubDomains and Upstream server Configuration
StubDomains and upstream servers specified in the `kube-dns` ConfigMap in the `kube-system` namespace
are automatically picked up by `node-local-dns` pods. The ConfigMap contents need to follow the format
shown in [the example](/docs/tasks/administer-cluster/dns-custom-nameservers/#example-1).
The `node-local-dns` ConfigMap can also be modified directly with the stubDomain configuration
in the Corefile format. Some cloud providers might not allow modifying `node-local-dns` ConfigMap directly.
In those cases, the `kube-dns` ConfigMap can be updated.