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Did you also check the resolv.conf inside the pod? And how the resolv reflects in CoreDNS? If it's only a single website, you may just want to manage an entry in the CoreDNS config. Since you're using hostnetwork, are your pods also in hostNetwork mode? If so, the dnsPolicy

ClusterFirstWithHostNet

may also be interesting, see https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-s-dns-policy