If the hostNetwork is set to true in pod spec, it receives the same IP address as host. While the pod can be reached at with this ip, I am not able to reach the pod through a service. If I set the clusterIP to None in service, the dns lookup doesn't return any results. If a clusterIP is assigned, traffic is not redirected to the backend pod.
How does service discovery work for pods with hostNetwork=true
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(definitely wrong, misunderstood the question) The problem is in /etc/resolv.conf
When using hostNetwork=true you get host's dns servers and you don't have cluster dns there.
Track issue on github