Control Plane Failures

Check node status: k get nodes
Check status of pods running on the cluster: k get pods -A

Check control plane services:

  # If running as pods then get and describe the pods
  k get po -n kube-system kube-apiserver-master

  # If running as services:
  # Masters
  service kube-apiserver status
  service kube-controller-manager status
  service kube-scheduler status

  # Workers
  service kubelet status
  service kube-proxy status

Check Service Logs:

  # If running as containers then use 
  k logs -n kube-system kube-apiserver-master

  # If running as services then use the logging solutions, for ubuntu:
  sudo journalctl -u kube-apiserver

See docs for more on debugging clusters:
https://kubernetes.io/docs/tasks/debug/debug-cluster/

Control Plane Failures

Training notes for the CKA certification course