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K8s Service → Pod Traffic Path
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K8s Service → Pod Traffic Path
When you hit a Service's ClusterIP, how does the packet get DNAT'd to one of its Pods? From the node entry to the Pod's NIC, then the return path.
💻
External Client
curl svc:80
K8s Node(集群内)
🔄 kube-proxy
watch Endpoints + 写 iptables
📦 Service (ClusterIP)
my-svc · 10.96.0.1:80
🧮 iptables DNAT
-A PREROUTING -j DNAT
📦 Pod A
10.244.1.2:8080
📦 Pod B
10.244.1.3:8080
CNI 网络
GET /api → 10.96.0.1:80
包进入节点 → iptables 拦下
← CDN Full-Chain Origin Fetch
SSH Port Forwarding — Three Data Flows →