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# 查找具有先前设置实例预热时间的扩缩策略
<a name="find-policies-with-a-previously-set-instance-warmup"></a>

要确定您的策略是否有为 `EstimatedInstanceWarmup` 设置的自己的预热时间，请使用 Amazon CLI运行以下 [describe-policies](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/autoscaling/describe-policies.html) 命令。{{my-asg}}替换为您的 Auto Scaling 组的名称。

```
aws autoscaling describe-policies --auto-scaling-group-name {{my-asg}}
  --query 'ScalingPolicies[?EstimatedInstanceWarmup!=`null`]'
```

下面是示例输出。

```
[
  {
    "AutoScalingGroupName":"my-asg",
    "PolicyName":"cpu50-target-tracking-scaling-policy",
    "PolicyARN":"{{arn}}",
    "PolicyType":"TargetTrackingScaling",
    "StepAdjustments":[],
    "EstimatedInstanceWarmup":120,
    "Alarms":[{
        "AlarmARN": "arn:aws:cloudwatch:us-west-2:123456789012:alarm:TargetTracking-my-asg-AlarmHigh-fc0e4183-23ac-497e-9992-691c9980c38e",
        "AlarmName": "TargetTracking-my-asg-AlarmHigh-fc0e4183-23ac-497e-9992-691c9980c38e"
      },
      {
            "AlarmARN": "arn:aws:cloudwatch:us-west-2:123456789012:alarm:TargetTracking-my-asg-AlarmLow-61a39305-ed0c-47af-bd9e-471a352ee1a2",
            "AlarmName": "TargetTracking-my-asg-AlarmLow-61a39305-ed0c-47af-bd9e-471a352ee1a2"
    }],
    "TargetTrackingConfiguration":{
      "PredefinedMetricSpecification":{
        "PredefinedMetricType":"ASGAverageCPUUtilization"
      },
      "TargetValue":50.0,
      "DisableScaleIn":false
    },
    "Enabled":true
  },
  
    {{... additional policies ...}}
                        
]
```