The Unexpected Admission Error in Kubernetes shows a failure to write a device plugin checkpoint file because there was no space left on the device. This article explains the steps to fix the issue easily. Bobcares, as a part of our Kubernetes Support Service offers solutions to every query that comes our way.

Fixing Unexpected Admission Error in Kubernetes

Sometimes, we may face the UnexpectedAdmissionError with some pods due to disk space issues on a node. The error message indicated a failure to write a device plugin checkpoint file because there was no space left on the device. This also led to the node showing an OutOfDisk status.

The error may be caused by a problem with the CPU Manager, Device Manager, Topology Manager, extended resource provisioning, or plugin resources. We can fix the issue by rebooting the node. Since the pods were part of a replica set, they were automatically spawned on other nodes, so we must delete the original pods.

Steps to Fix the Error

Let’s look into the details of the steps to fix the error:

1. Initially, we can fix the disk space issue by rebooting the node.

2. Now, we’ve to delete the Error Pods. We can easily do it by using the next command:

And to delete error pods across the entire cluster, we can use the following code:

3. In order to delete pods with UnexpectedAdmissionError, the code is as follows:

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Conclusion

Unexpected admission errors in Kubernetes can be frustrating. These errors occur when the server cannot process or accept a request due to some issue. By following these steps from our Tech team, we can easily resolve the errors and ensure the smooth running of my Kubernetes cluster.