Kubernetes Networking Deep Dive
Kubernetes networking rests on a single foundational contract: every Pod gets a unique, routable IP, and any Pod can reach any other Pod on any node without NAT. This topic traces that contract from the Linux kernel primitives that implement it — network namespaces, veth pairs, bridges, and iptables — through the CNI plugin ecosystem (Flannel VXLAN overlay, Calico BGP underlay, Cilium eBPF dataplane), up through CoreDNS service discovery including the ndots:5 problem, NetworkPolicy enforcement and its CNI dependencies, and Service networking internals including how kube-proxy implements ClusterIP via iptables DNAT chains or IPVS virtual servers, EndpointSlice sharding, and the externalTrafficPolicy: Local trade-off for source IP preservation.
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More DevOps topics
- Kubernetes Evictions and Node Pressure
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- Kubernetes Multi-cloud and Hybrid Cluster Patterns
- Kubernetes Multi-tenancy Patterns
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- Kubernetes Network Policies
- Kubernetes Observability: Metrics, Logs, and Traces
- Kubernetes Operators & CRDs
- Kubernetes Pod Networking & CNI
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