How to fix install CNI plugin failed in Kubernetes

KubernetesADVANCEDCRITICAL

Error when CNI plugin fails to install

What this error means

Pod networking plugin could not initialize

1Verify installed

kubectl get pods -n kube-system

2Install CNI

kubectl apply -f flannel/calico

3Check binary

ls /opt/cni/bin

4Verify kubelet

sudo grep cni /etc/sysconfig/kubelet

Restart kubelet

CNI essential for pod networking. Multiple plugins: Flannel, Calico, Weave, Cilium. DaemonSets install on nodes.