07-Worker-Node-Failure.md

Worker Node Failure

• Lets check the status of the Nodes in the cluster, are they Ready or NotReady

  kubectl get nodes
  

• If they are NotReady then check the LastHeartbeatTime of the node to find out the time when node might have crashed

  kubectl describe node worker-1
  

  

• Check the possible CPU and MEMORY using top and df -h

  

• Check the status and the logs of the kubelet for the possible issues.

  serivce kubelet status
  

  sudo journalctl –u kubelet
  

  

• Check the kubelet Certificates, they are not expired, and in the right group and issued by the right CA.

  openssl x509 -in /var/lib/kubelet/worker-1.crt -text