# Amazon EC2：允许以编程方式和在控制台中启动或停止 EC2 实例并修改安全组
<a name="reference_policies_examples_ec2_instance-securitygroup"></a>

此示例说明如何创建基于身份的策略以允许启动或停止特定的 EC2 实例并修改特定的安全组。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 ]

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```
{
  "Version":"2012-10-17",		 	 	 
  "Statement": [
    {
      "Action": [
        "ec2:DescribeInstances",
        "ec2:DescribeSecurityGroups",
        "ec2:DescribeSecurityGroupReferences",
        "ec2:DescribeStaleSecurityGroups"
      ],
      "Resource": "*",
      "Effect": "Allow"
    },
    {
      "Action": [
        "ec2:AuthorizeSecurityGroupEgress",
        "ec2:AuthorizeSecurityGroupIngress",
        "ec2:RevokeSecurityGroupEgress",
        "ec2:RevokeSecurityGroupIngress",
        "ec2:StartInstances",
        "ec2:StopInstances"
      ],
      "Resource": [
        "arn:aws:ec2:*:*:instance/i-instance-id",
        "arn:aws:ec2:*:*:security-group/sg-security-group-id"
      ],
      "Effect": "Allow"
    }
  ]
}
```

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