Inspect log files of systemd server

journalctl -u [unitfile]

for example, for a service named kube-apiserver, you should do the following:

   sudo journalctl -u kube-apiserver

Other kubernetes services checking log files:

sudo journalctl -u kube-controller-manager

sudo journalctl -u kube-scheduler

sudo journalctl -u kubelet

sudo journalctl -u kube-proxy