This error occurs when the kubelet reaches its file descriptor limit, preventing new connections and pod operations.
Fixes Kubelet file descriptor limit
# Kubelet file descriptor limitKubelet file descriptor limit
The "Kubelet file descriptor limit" error indicates that the kubelet has exhausted available file descriptors.
ulimit -n
cat /proc/<kubelet-pid>/limits | grep files
echo "* soft nofile 65536" >> /etc/security/limits.conf
lsof -p <container-pid> | wc -l
sudo systemctl restart kubelet
Default Linux FD limit usually 1024 per process. For Kubernetes, increase to 65536+.