Kubernetes error dialing backend can be resolved with a little assistance from our experts. Read on to find out more. 

At Bobcares, we offer solutions for every query, big and small, as a part of our Server Management Services.

Let’s take a look at how our Support Team is ready to help customers resolve Kubernetes error dialing backend.

How to resolve Kubernetes Error dialing backend

The “dialing backend” Kubernetes error may be due to a communication error between kube-apiserver.service and the kubelet.service. According to our Support Techs, we can SSH into the control node and then proceed as seen below:

telnet hostname(workernode) 10250
telnet privateip(workernode) 1025

In case the telnet test fails, it may be due to the firewall on the worker nodes. In this scenario, we have to open port 10250 in the worker nodes. We can verify that the kubelet runs on this port as seen below:

lsof -i :10250

However, if the telnet test does not succeed with public ip or hostname but works with the private ip, we have to add the unit service file of the kube-apiserver the following:

--kubelet-preferred-address-types InternalIP

After saving the file, run the following commands:

systemctl daemon-reload
systemctl restart kube-apiserver

In short, we can resolve the Kubernetes error dialing backend with the following steps, courtesy of our Support Team:

1. To begin with, check if the kubelet process is currently running.
2. If it is running, ensure that the kubelet has started.
3. Next, examine the /var/log/message file for any issues with the node.
4. Additionally, we have to make sure the firewall is not blocking the traffic.

Additionally, we can resolve the dialing backend error by ensuring the ports 9000,22 and 1194 are open in order to connect to the API server. It is also a good idea to ensure the tunnelfront or aks-link pod is currently running in the kube-system namespace via the following command:

kubectl get pods --namespace kube-system

Let us know which of these tips helped you resolve the “dialing backend” Kubernetes error.

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Conclusion

In a nutshell, our skilled Support Engineers at Bobcares demonstrated how to resolve the “dialing backend” error.