# Amazon EC2：允许以编程方式和使用控制台在特定子网中启动 EC2 实例
<a name="reference_policies_examples_ec2_instances-subnet"></a>

此示例说明您如何创建基于身份的策略以允许列出所有 EC2 对象的信息并在特定的子网中启动 EC2 实例。此策略定义了程序访问和控制台访问的权限。要使用此策略，请将示例策略中的{{斜体占位符文本}}替换为您自己的信息。然后，按照[创建策略](access_policies_create.md)或[编辑策略](access_policies_manage-edit.md)中的说明操作。

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#### [ JSON ]

****  

```
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "ec2:Describe*",
                "ec2:GetConsole*"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": "ec2:RunInstances",
            "Resource": [
                "arn:aws:ec2:{{*}}:{{*}}:subnet/subnet-{{subnet-id}}",
                "arn:aws:ec2:{{*}}:{{*}}:network-interface/*",
                "arn:aws:ec2:{{*}}:{{*}}:instance/*",
                "arn:aws:ec2:{{*}}:{{*}}:volume/*",
                "arn:aws:ec2:{{*}}::image/ami-*",
                "arn:aws:ec2:{{*}}:{{*}}:key-pair/*",
                "arn:aws:ec2:{{*}}:{{*}}:security-group/*"
            ]
        }
    ]
}
```

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