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DevOps & Automation · Intermediate

CoreDNS

The default cluster DNS server in Kubernetes that resolves Service and pod names.

Definition

Services resolve as <service>.<namespace>.svc.cluster.local. CoreDNS is configured via the coredns ConfigMap (Corefile) in kube-system.

Example

nslookup web.prod.svc.cluster.local from a debug pod.

Exam tip

DNS failures in pods are often CoreDNS pod or NetworkPolicy issues.

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