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DevOps & Automation · Intermediate

Container Network Interface (CNI)

A CNCF specification and plugin model for configuring network interfaces for containers, used by Kubernetes for pod networking.

Definition

CNI plugins such as Calico, Cilium, Flannel, and cloud VPC CNIs assign pod IPs and implement the flat pod network. NetworkPolicy enforcement depends on the CNI.

Example

Installing Calico gives pods routable IPs and enforces NetworkPolicies.

Exam tip

Flannel alone does not enforce NetworkPolicy; choose Calico or Cilium if policies are required.

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