EKS - aws-ebs-csi-driver add-on advanced configuration problem arisen suddenly

Question

Hi, I am using the aws-ebs-csi-driver add-on, and while it used to work so far, suddenly I noticed that this plugin was in degraded state (without me doing anything), then I could not upgrade its version, until I removed this configuration, and now I cannot add it back. I get the below error when I try to input advanced configuration below:

> UnsupportedAddonModification	Amazon EKS was unable to complete the addon operation. The configuration values provided are invalid.

Here is my JSON:
```
{
	"controller": {
		"nodeSelector": {
			"kubernetes.io/os": "linux",
			"aaaaa": "xxx-yyy-zzz",
			"some_other_key": "abcd"
		}
	}
}
```

which seems valid, according to the schema I get from

```
aws eks describe-addon-configuration --addon-name aws-ebs-csi-driver --addon-version v1.17.0-eksbuild.1 
```

I also tried without whitespace, but same result. Also tried in YAML format, nothing, same error.

Has something changed? Some new bug? It doesn't make sense really.

MikeStef · Answer

The above is due to the fact that "kubernetes.io/os": "linux"  is included the node selector. This key/value is already hardcoded into the node selector used in the add-on.
If you remove "kubernetes.io/os": "linux", it should work fine, and they will still get that node selector since it's built into the add-on anyways.

EKS - aws-ebs-csi-driver add-on advanced configuration problem arisen suddenly

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