This error occurs when the API server cannot authenticate to a kubelet on a worker node, preventing node communication and pod operations.
Fixes Kubelet API authentication failed
# Kubelet API authentication failedKubelet API authentication failed
The "Kubelet API authentication failed" error indicates that the API server cannot authenticate itself when communicating with kubelets on worker nodes.
kubectl get nodes
kubectl logs -n kube-system -l component=kubelet
openssl x509 -in /var/lib/kubelet/pki/kubelet.crt -noout -dates
kubectl logs -n kube-system pod/kube-apiserver-<node>
kubeadm certs renew all
Kubelet authentication uses x509 certificates. Ensure certs are valid and API server has correct node authorization.