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.

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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