Troubleshooting kubelet service issues

Unified Compute Platform (UCP) Advisor Software Installation Guide

Part Number

Use the following guidelines and suggested steps to help resolve kubelet service issues that occur after upgrading UCP Advisor.

The kubelet service become unavailable if the Master Node VM is rebooted after upgrading UCP Advisor to version 4.5.
What it Means:
Running any kubectl command causes the following error:
The connection to the server xx.xx.xx.xx:6443 was refused - did you specify the right host or port?
Corrective Action:
  1. Using SSH, log on to the Master Node VM.
  2. Navigate to the /var/lib/kubelet folder.
  3. In Edit mode, open the config.yaml file.
  4. Update the value for the cgroupDriver parameter to systemd.
  5. Exit Edit mode: press the Esc key.
  6. Save the changes. Enter:
  7. Run the following commands to restart the kubelet service:
    systemctl stop kubelet
    systemctl stop docker
    iptables --flush
    iptables -tnat --flush
    systemctl start docker
    systemctl start kubelet