terraform-demo/modules/iam/eks-cluster.json.tftpl

{
    "Version" : "2012-10-17",
    "Statement" : [
      {
        "Effect" : "Allow",
        "Principal" : {
          "Service" : [
            "eks.amazonaws.com"
          ]
        },
        "Action" : "sts:AssumeRole"
      }
    ]
  }