Can Kubernetes pod that uses the host network send requests directly to a Service resource by using the service name and service port (incl. utilization of CoreDNS)? Or do I have to expose the service via nodePort on the host network?
Can Kubernetes pods that use host networking access Service resources by the service name and service port?
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If you want a pod to send requests directly to service resource you have to change pod's
dnsPolicytoClusterFirstWithHostNet. It should be used explicitly for pods running withhostNetwork: true. This way it will use cluster DNS and will be in host network.You can check it in
/etc/resolv.conffile. When you are usingdnsPolicy: ClusterFirstthis file is inherited by pod and uses host's DNS resolver. When you setdnsPolicy: ClusterFirstWithHostNetit will change DNS resolver to cluster's DNS.