# 配置 Amazon ECS 容量提供程序，以安全关闭实例
<a name="enable-managed-instance-draining"></a>

使用 Amazon ECS 控制台和 AWS CLI 创建或更新自动扩缩组容量提供程序时，您可以开启托管式实例耗尽功能。

**注意**  
创建容量提供程序时，默认情况下，托管式实例耗尽功能已开启。

以下是使用 AWS CLI 创建启用托管实例耗尽功能的容量提供程序，以及为集群的现有容量提供程序启用托管实例耗尽功能的示例。

**创建启用托管实例耗尽功能的容量提供程序**  
要创建启用托管实例耗尽功能的容量提供程序，请使用 `create-capacity-provider` 命令。将 `managedDraining` 参数设置为 `ENABLED`。

```
aws ecs create-capacity-provider \
--name capacity-provider \
--auto-scaling-group-provider '{
  "autoScalingGroupArn": "asg-arn",
  "managedScaling": {
    "status": "ENABLED",
    "targetCapacity": 100,
    "minimumScalingStepSize": 1,
    "maximumScalingStepSize": 1
  },
  "managedDraining": "ENABLED",
  "managedTerminationProtection": "ENABLED",
}'
```

响应：

```
{
    "capacityProvider": {
        "capacityProviderArn": "capacity-provider-arn",
        "name": "capacity-provider",
        "status": "ACTIVE",
        "autoScalingGroupProvider": {
            "autoScalingGroupArn": "asg-arn",
            "managedScaling": {
                "status": "ENABLED",
                "targetCapacity": 100,
                "minimumScalingStepSize": 1,
                "maximumScalingStepSize": 1
            },
            "managedTerminationProtection": "ENABLED"
            "managedDraining": "ENABLED"
        }
    }
}
```

**为集群的现有容量提供程序启用托管实例耗尽功能**  
使用 `update-capacity-provider` 命令为集群的现有容量提供程序启用托管实例耗尽功能。您会看到 `managedDraining` 目前显示为 `DISABLED` 而 `updateStatus` 显示为 `UPDATE_IN_PROGRESS`。

```
aws ecs update-capacity-provider \
--name cp-draining \
--auto-scaling-group-provider '{
  "managedDraining": "ENABLED"
}
```

响应：

```
{
    "capacityProvider": {
        "capacityProviderArn": "cp-draining-arn",
        "name": "cp-draining",
        "status": "ACTIVE",
        "autoScalingGroupProvider": {
            "autoScalingGroupArn": "asg-draining-arn",
            "managedScaling": {
                "status": "ENABLED",
                "targetCapacity": 100,
                "minimumScalingStepSize": 1,
                "maximumScalingStepSize": 1,
                "instanceWarmupPeriod": 300
            },
            "managedTerminationProtection": "DISABLED",
            "managedDraining": "DISABLED" // before update
        },
        "updateStatus": "UPDATE_IN_PROGRESS", // in progress and need describe again to find out the result
        "tags": [
        ]
    }
}
```



使用 `describe-clusters` 命令并包含 `ATTACHMENTS`。托管实例耗尽 attachment 的 `status` 为 `PRECREATED`，总体 `attachmentsStatus` 为 `UPDATING`。

```
aws ecs describe-clusters --clusters cluster-name --include ATTACHMENTS
```

响应：

```
{
    "clusters": [
        {
            ...

            "capacityProviders": [
                "cp-draining"
            ],
            "defaultCapacityProviderStrategy": [],
            "attachments": [
                # new precreated managed draining attachment
                {
                    "id": "a1b2c3d4-5678-90ab-cdef-EXAMPLE11111",
                    "type": "managed_draining",
                    "status": "PRECREATED",
                    "details": [
                        {
                            "name": "capacityProviderName",
                            "value": "cp-draining"
                        },
                        {
                            "name": "autoScalingLifecycleHookName",
                            "value": "ecs-managed-draining-termination-hook"
                        }
                    ]
                },

                ...

            ],
            "attachmentsStatus": "UPDATING"
        }
    ],
    "failures": []
}
```

更新完成后，使用 `describe-capacity-providers`，您将看到 `managedDraining` 现在为 `ENABLED`。

```
aws ecs describe-capacity-providers --capacity-providers cp-draining
```

响应：

```
{
    "capacityProviders": [
        {
            "capacityProviderArn": "cp-draining-arn",
            "name": "cp-draining",
            "status": "ACTIVE",
            "autoScalingGroupProvider": {
                "autoScalingGroupArn": "asg-draning-arn",
                "managedScaling": {
                    "status": "ENABLED",
                    "targetCapacity": 100,
                    "minimumScalingStepSize": 1,
                    "maximumScalingStepSize": 1,
                    "instanceWarmupPeriod": 300
                },
                "managedTerminationProtection": "DISABLED",
                "managedDraining": "ENABLED" // successfully update
            },
            "updateStatus": "UPDATE_COMPLETE",
            "tags": []
        }
    ]
}
```