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# 使用 Application Auto Scaling 描述步进缩放策略 AWS CLI
<a name="describe-step-scaling-policy"></a>

您可以使用[describe-scaling-policies](https://docs.aws.amazon.com/cli/latest/reference/application-autoscaling/describe-scaling-policies.html)命令描述服务命名空间的所有扩展策略。以下示例描述了所有 Amazon ECS 服务的所有扩展策略。要针对特定 Amazon ECS 服务列出它们，只需添加 `--resource-id` 选项即可。

```
aws application-autoscaling describe-scaling-policies --service-namespace ecs
```

您可以使用 `--query` 参数将结果筛选为仅步进扩展策略。有关 `query` 的语法的更多信息，请参阅 *AWS Command Line Interface 用户指南*中的[控制 AWS CLI的命令输出](https://docs.aws.amazon.com/cli/latest/userguide/cli-usage-output.html)。

**Linux、macOS 或 Unix**

```
aws application-autoscaling describe-scaling-policies --service-namespace ecs \
  --query 'ScalingPolicies[?PolicyType==`StepScaling`]'
```

**Windows**

```
aws application-autoscaling describe-scaling-policies --service-namespace ecs ^
  --query "ScalingPolicies[?PolicyType==`StepScaling`]"
```

**Output**  
下面是示例输出。

```
[
    {
        "PolicyARN": "PolicyARN",
        "StepScalingPolicyConfiguration": {
            "MetricAggregationType": "Average",
            "Cooldown": 60,
            "StepAdjustments": [
                {
                    "MetricIntervalLowerBound": 0.0,
                    "MetricIntervalUpperBound": 15.0,
                    "ScalingAdjustment": 1
                },
                {
                    "MetricIntervalLowerBound": 15.0,
                    "MetricIntervalUpperBound": 25.0,
                    "ScalingAdjustment": 2
                },
                {
                    "MetricIntervalLowerBound": 25.0,
                    "ScalingAdjustment": 3
                }
            ],
            "AdjustmentType": "ChangeInCapacity"
        },
        "PolicyType": "StepScaling",
        "ResourceId": "service/my-cluster/my-service",
        "ServiceNamespace": "ecs",
        "Alarms": [
            {
                "AlarmName": "Step-Scaling-AlarmHigh-ECS:service/my-cluster/my-service",
                "AlarmARN": "arn:aws:cloudwatch:region:012345678910:alarm:Step-Scaling-AlarmHigh-ECS:service/my-cluster/my-service"
            }
        ],
        "PolicyName": "my-step-scaling-policy",
        "ScalableDimension": "ecs:service:DesiredCount",
        "CreationTime": 1515024099.901
    }
]
```