Create an EBS CSI driver IAM role with the required permissions and attach it to the CSI driver add-on

Why the Answer Is Correct

The reported error, could not create volume in EC2: UnauthorizedOperation, is returned by the EC2 API when the caller is not authorized to create the volume, and the caller in this case is the Amazon EBS CSI driver running in the cluster. Because the cluster already has an OpenID Connect issuer associated, the driver has an identity with which an IAM role can be associated, so the correct fix is to create an EBS CSI driver IAM role that contains the required permissions for provisioning and deleting volumes along with the appropriate trust relationships, and then attach that role to the Amazon EBS CSI driver add-on in the cluster (B). Srikantha identified exactly this reading of the error, that the EBS CSI driver lacks the IAM permissions to provision EBS volumes through the EC2 API, and teo2157 and uncledana both cited the AWS EBS CSI documentation as the basis. Once the role is attached, the driver is authorized and the PVC provisions normally. B is the correct answer.

Why the Other Options Are Wrong

A creates a Kubernetes cluster role allowing persistent volumes to perform get, list, watch, create, and delete operations and allows get, list, and watch for storage in the cluster. A Kubernetes RBAC cluster role grants permissions on Kubernetes API objects to Kubernetes identities; it cannot authorize the CSI driver's call to the EC2 CreateVolume API, which is an AWS API call made using an IAM role. The UnauthorizedOperation error would therefore persist unchanged. C adds the ebs.csi.aws.com/volumeType:gp3 annotation to the PersistentVolumeClaim object. This annotation only influences how the volume is provisioned, for example which volume type is requested; it grants no IAM permissions to the driver and so cannot resolve an authorization failure. D creates a Kubernetes storage class object with the provisioner set to ebs.csi.com and volumeBindingMode set to WaitForFirstConsumer. This controls which provisioner handles the volume and when binding occurs, but it supplies no IAM authorization to the driver, so it too leaves the UnauthorizedOperation error in place. B is correct.

Community Comment Notes

Community voted B unanimously. Srikantha gave the decisive diagnosis, that the key error is could not create volume in EC2: UnauthorizedOperation, indicating the EBS CSI driver does not have the required IAM permissions to provision EBS volumes via the EC2 API. teo2157 cited the AWS EKS documentation page on the EBS CSI driver as confirmation. uncledana agreed that the root cause is the missing IAM permissions and that creating the appropriate role with the correct trust relationship resolves it. No alternative received support.