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aws lambda で UnauthorizedOperation エラー

Last updated at Posted at 2021-05-17

aws の lambda で EC2 のリストを生成したく、describe_instances(python3.8/boto3)を実行したら以下のエラー。

Response
{
  "errorMessage": "An error occurred (UnauthorizedOperation) when calling the DescribeInstances operation: You are not authorized to perform this operation.",
  "errorType": "ClientError",
  "stackTrace": [
    "  File \"/var/task/lambda_function.py\", line 8, in lambda_handler\n    response = ec2client.describe_instances()\n",
    "  File \"/var/runtime/botocore/client.py\", line 357, in _api_call\n    return self._make_api_call(operation_name, kwargs)\n",
    "  File \"/var/runtime/botocore/client.py\", line 676, in _make_api_call\n    raise error_class(parsed_response, operation_name)\n"
  ]
}

DescribeInstances operation をコールするときに、UnauthorizedOperation = 権限無いよ のエラー発生。
とのことなので、IAM のロール設定を見直す。

Lmbda → 関数 → 対象Lambda関数 → 設定タブ → アクセス権限 → 実行ロール →
【ポリシーをアタッチします】 → 【AmazonEC2ReadOnlyAccess】 選択

無事、エラーは出なくなりました。

めでたしめでたし。

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