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# 限制用户访问某些 Notebook 实例
<a name="restrict-access-notebook-instances"></a>

要限制某些用户对特定 Braket Notebook 实例的访问，您可以向特定角色、用户或组添加*拒绝权限*策略。

以下示例使用[策略变量](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_variables.html)有效地限制启动、停止和访问中特定笔记本实例的权限 AWS 账户 `123456789012`，该实例根据应具有访问权限的用户命名（例如，用户`Alice`将有权访问名为的笔记本实例`amazon-braket-Alice`）。

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#### [ JSON ]

****  

```
{
  "Version":"2012-10-17",		 	 	 
  "Statement": [
    {
      "Sid": "DenyCreateDeleteUpdateNotebookInstances",
      "Effect": "Deny",
      "Action": [
        "sagemaker:CreateNotebookInstance",
        "sagemaker:DeleteNotebookInstance",
        "sagemaker:UpdateNotebookInstance",
        "sagemaker:CreateNotebookInstanceLifecycleConfig",
        "sagemaker:DeleteNotebookInstanceLifecycleConfig",
        "sagemaker:UpdateNotebookInstanceLifecycleConfig"
      ],
      "Resource": "*"
    },
    {
      "Sid": "DenyDescribeStartStopNotebookInstances",
      "Effect": "Deny",
      "Action": [
        "sagemaker:DescribeNotebookInstance",
        "sagemaker:StartNotebookInstance",
        "sagemaker:StopNotebookInstance"
      ],
      "NotResource": [
        "arn:aws:sagemaker:*:123456789012:notebook-instance/amazon-braket-${aws:username}"
      ]
    },
    {
      "Sid": "DenyNotebookInstanceUrl",
      "Effect": "Deny",
      "Action": [
        "sagemaker:CreatePresignedNotebookInstanceUrl"
      ],
      "NotResource": [
        "arn:aws:sagemaker:*:123456789012:notebook-instance/amazon-braket-${aws:username}*"
      ]
    }
  ]
}
```

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