This article explains the fundamentals of DNS, its role as an application‑layer protocol, and how Kubernetes generates and manages each pod's /etc/resolv.conf through kubelet, covering nameserver, search, ndots options, dnsPolicy choices, and custom dnsConfig examples.
This article explains how CoreDNS runs on a Caddy‑based HTTP/2 server in Kubernetes, how kubelet injects the cluster DNS IP into each container’s /etc/resolv.conf, and how different dnsPolicy settings (Default, ClusterFirst, ClusterFirstWithHostNet, None) affect the resolv.conf configuration, including key options and examples.
This article explores how Kubernetes resolves DNS queries by examining the Pod's resolv.conf configuration, the CoreDNS service implementation via iptables rules, and the impact of search and ndots options on query behavior, providing practical examples and optimization tips.
