1. Verify that all your worker nodes are healthy

List the nodes and make sure they all have the status Ready

k get no

Describe the worker nodes to get additional information

k describe node worker1

2. Stop the kubelet process on the worker1

First run a shell on worker1, then stop kubelet (it is managed by systemd)

sudo systemctl stop kubelet

Make sure it is correctly stopped

sudo systemctl status kubelet

3. Check the status of worker1

From the list of node, worker1 should appear as NotReady

k get no

Describing worker1 yoy should see the node as an unknown status (NodeStatusUnknown)

k describe node worker1

4. Restart the kubelet process on worker1 and make sure everything is now fine

First run a shell on worker1, then start kubelet

sudo systemctl start kubelet

Make sure it is correctly started

sudo systemctl status kubelet

Listing the node or describing worker1 you should see everything is back to normal