Kubernetes Networking Deep Dive¶

Kubernetes networking is critical for SREs and system administrators. Pods must communicate with each other and with services, often across nodes.

Kubernetes Networking Model¶

Kubernetes uses a flat network model. Every Pod gets its own IP and can talk to other Pods directly.

CNI (Container Network Interface)¶

CNI is the standard interface for networking in Kubernetes. Popular plugins: Cilium, Calico.

kubectl apply -f cni-config.yaml

Example: Create a Pod¶

kubectl run nginx --image=nginx --restart=Never
kubectl get pods

Use kubectl describe pod nginx to inspect networking details.

References¶

• Kubernetes CNI
• CNI Spec
• Cilium
• Calico