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This article explains how Kubernetes assigns unique IP addresses to Pods using Flannel as the CNI network provider and Containerd as the container runtime, covering underlying concepts like Linux bridges, VXLAN encapsulation, node IPAM, and the interactions among kubelet, CRI, and CNI plugins.
The article explains how Kubernetes allocates Pod IPs—from cluster and node CIDR configuration, through the kubelet‑driven Pod lifecycle and CNI IPAM process, including dual‑stack support, hostNetwork handling, and optional IP reservation/reclamation mechanisms for stable stateful workloads.
This article demystifies Kubernetes networking by explaining the fundamental design of unique Pod IPs, intra‑node communication via veth pairs and bridges, and inter‑node packet routing across CIDR blocks, providing clear step‑by‑step illustrations of how containers talk within and between nodes.
This article explains the core principles of Kubernetes networking, covering pod IP allocation, intra‑node communication via veth pairs and bridges, and inter‑node packet routing using CIDR blocks and cloud provider routes, all illustrated with diagrams.