We have a cluster with 4 worker nodes and 1 master, and the flannel CNI installed. 1 kube-flannel-ds-xxxx pod running on every node.
They used to run fine, but 1 node suddenly entered NotReady state and does not come out of it anymore.
journalctl -u kubelet -f on the node constanly emits "cni plugin not initialized"
Jul 25 14:44:05 ubdock09 kubelet: E0725 14:44:05.916280 13076 kubelet.go:2349] "Container runtime network not ready" networkReady="NetworkReady=false reason:NetworkPluginNotReady message:Network plugin returns error: cni plugin not initialized"
Deleting the flannel pod makes a new one start up but the pluin keeps being uninitialized. What can we do or check to fix this?