check kube-api server
k cluster-info
k version -o yaml
check node status
k get nodes
k describe nodes <NODE>
check system pods
k -n kube-system get pod
check service logs
sudo journactl -u kubelet
sudo journactl -u docker
sudo journactl -u containerd
check component logs
ls -l /var/log/{contaniers,pods}
k -n kube-system log PODNAME
check networking via netshoot
k run tmp-shell --rm -it --image nicolaka/netshoot