KB: Kube-proxy vs CNI Plugin

 kube-proxy is not considered a CNI plugin in Kubernetes or AKS (Azure Kubernetes Service). It serves a different purpose within the Kubernetes networking stack. Let me clarify the roles of kube-proxy and a CNI plugin


kube-proxy:

  • Role: kube-proxy manages network rules that allow communication between Kubernetes services and pods. It sets up the networking rules (e.g., iptables, IPVS, or eBPF) to enable service discovery and routing within the cluster.
  • Key Responsibilities:
    • Implements Kubernetes Service networking.
    • Forwards traffic from a service's ClusterIP to the appropriate pod(s) backing the service.
    • Handles load balancing for traffic directed to services.
  • Scope: It operates at the service level, not the pod-to-pod network level.

CNI Plugin:

  • Role: A CNI plugin is responsible for setting up the pod network. It ensures that all pods across the cluster can communicate with each other and with the host network.
  • Key Responsibilities:
    • Assigns IP addresses to pods.
    • Configures routes so pods on different nodes can communicate.
    • Implements networking policies (if supported by the plugin).
  • Scope: It operates at the pod networking level and ensures connectivity between pods and nodes.

Kubernetes Networking in AKS

In AKS, the CNI plugin and kube-proxy both play roles in the cluster's networking stack:

  1. CNI Plugin in AKS:

    • By default, AKS uses Azure CNI or Kubenet as the CNI plugin. These are responsible for pod IP address assignment and routing.
    • Azure CNI integrates Kubernetes networking with Azure's virtual network (VNet), enabling pods to get Azure VNet IPs directly.

  2. kube-proxy in AKS:

    • kube-proxy runs as a DaemonSet in the kube-system namespace.
    • It configures network rules (via iptables or IPVS) to route traffic between Kubernetes services and pods.



References:

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