Restarting nodes on kubernetes as the node status shows unknown

+2 votes

The status of the node is coming as unknown right now

"conditions": [
            "type": "Ready",
            "status": "Unknown",
            "lastHeartbeatTime": "2015-11-12T06:03:19Z",
            "lastTransitionTime": "2015-11-12T06:04:03Z",
            "reason": "Kubelet stopped posting node status."

kubectl get nodes shows that the node is not ready. How do I fix this?

Oct 22, 2018 in Kubernetes by Atul
• 5,530 points

edited Oct 23, 2018 by Kalgi 4,352 views

5 answers to this question.

0 votes

Considering that the node was previously working and recently stopped showing the ready status restart you kubelet service. Just ssh into the affected node and execute:

/etc/init.d/kubelet restart

Back on your master node run kubectl get nodes to check if the node is working now

answered Oct 22, 2018 by ajs3033
• 7,280 points
0 votes

Delete the node and then create a node object with the name of the one that died, bounce your schedulers & controllers, and then delete the node object. This seems to allow the scheduler to pick a new, good, node

answered Oct 23, 2018 by Kalgi
• 40,480 points
0 votes

You can try moving the cluster to the new node pool got rid of the weird stuck pods. But this is not the best solution, probably a temporary solution.

answered Oct 23, 2018 by lina
• 8,110 points
0 votes
I had faced a similar issue. In my case I had 10 nodes already up and running. I had created two new nodes and the status was stuck at unknown state. After a lot of research I figured I didnt have memory to deploy any more nodes. So in my case the memory was the issue. Try checking if you have sufficient memory.
answered Oct 23, 2018 by Karthik
0 votes
I had a similar issue, but mine was a very stupid silly mistake, I had made. On my node machine I had forgotten to unstall Docker engine. But what I still dont get it, is how did that node manage to join the cluster with having docker engine running on it?
answered Oct 23, 2018 by Zans

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