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用法

該動(dòng)作用來(lái)檢查云產(chǎn)品資源是否符合預(yù)期狀態(tài)，如是預(yù)期狀態(tài)，則任務(wù)執(zhí)行成功。否則，任務(wù)執(zhí)行失敗。通常用來(lái)做前置檢查。如要停止某ECS實(shí)例，則可以先檢查該ECS實(shí)例的狀態(tài)是運(yùn)行中狀態(tài)（Running），如果不是Running，則不執(zhí)行停止操作。

語(yǔ)法

此語(yǔ)法格式除了Type為ACS::CheckFor以外的所有字段和ACS::WaitFor一致，請(qǐng)參考ACS::WaitFor語(yǔ)法和說(shuō)明。

YAML

Tasks:
  - Name: checkForTaskExample
    Action: ACS::CheckFor
    Properties: 
      # 以下屬性和ACS::ExecuteAPI一致，請(qǐng)參考ACS::ExecuteAPI語(yǔ)法說(shuō)明。
      Service: ECS
      API: DescribeInstances
      Parameters: 
        InstanceId: i-12345678abcedfg
      # 以下屬性為ACS::CheckFor的特殊屬性
      PropertySelector: "jq selector" # 必填，需要等待的具體的API返回值，參考ACS::ExecuteAPI中的ValueSelector說(shuō)明
      DesiredValues: # DesiredValue，NotDesiredValues 必填其一，指上面截取的值要匹配到以下值之一，匹配則表示成功，否則會(huì)超時(shí)然后失敗。
        - value1
        - value2
      NotDesiredValues: # DesiredValue，NotDesiredValues 必填其一，指上面截取的值要不匹配到以下的所有值，全都不匹配則表示成功，否則會(huì)超時(shí)然后失敗。
        - value3
        - value4
    Outputs: # CheckFor動(dòng)作所在的任務(wù)支持輸出，當(dāng)任務(wù)滿足NotDesiredValues/DesiredValues的條件時(shí)，任務(wù)執(zhí)行成功后會(huì)返回輸出參數(shù)的值。
      OutputParameter1: 
        ValueSelector: 'jq selector' # jq的選擇器語(yǔ)法，以O(shè)penAPI的返回作為JSON輸入，jq的語(yǔ)法請(qǐng)參考 https://stedolan.github.io/jq/
        Type: String/Boolean/List(Array)/Number/Object

JSON

{
    "Tasks": [
        {
            "Name": "checkForTaskExample",
            "Action": "ACS::CheckFor",
            "Properties": {
                "Service": "ECS",
                "API": "DescribeInstances",
                "Parameters": {
                    "InstanceId": "i-12345678abcedfg"
                },
                "PropertySelector": "jq selector",
                "DesiredValues": [
                    "value1",
                    "value2"
                ],
                "NotDesiredValues": [
                    "value3",
                    "value4"
                                    ]
                          }，
		"Outputs": {
        "OutputParameter1": {
          "ValueSelector": "jq selector",
          "Type": "String/Boolean/List(Array)/Number/Object"
        }
      }
        }
            ]
}

示例

如下模板：為指定磁盤(pán)創(chuàng)建快照。用CheckFor檢查特定實(shí)例是否處于Running或Stopped狀態(tài)。

YAML

FormatVersion: OOS-2019-06-01
Parameters:
  DiskId:
    Description: the disk id of the snap shot to copy 
    Type: String
  InstanceId:
    Description: the instances id  of the snap shot to copy 
    Type: String
  SnapshotName:
    Description: snap shot name of the new snap
    Type: String
Tasks:
- Name: checkInstanceReady
	Action: ACS::CheckFor
  Properties:
  	Service: ECS
    API: DescribeInstances
    DesiredValues:
    - Running
    - Stopped
    Parameters:
      InstanceIds:
      - '{{ InstanceId }} '
    PropertySelector: Instances.Instance[].Status
- Name: createSnapshot
	Action: ACS::ExecuteAPI
  Properties:
  	Service: ECS
    API: CreateSnapshot
    Parameters:
      DiskId: '{{ DiskId }}'
      SnapshotName: '{{ SnapshotName }}'
		Outputs:
      SnapshotId:
        Type: String
        ValueSelector: SnapshotId
- Name: waitSnapshotsReady
	Action: ACS::WaitFor
  Properties:
  	Service: ECS
    API: DescribeSnapshots
    DesiredValues:
    - accomplished
    Parameters:
      SnapshotIds:
      - '{{ createSnapshot.SnapshotId }}'
    PropertySelector: Snapshots.Snapshot[].Status
Outputs:
  SnapshotId:
    Type: String
    Value: '{{ createSnapshot.SnapshotId }}'

JSON

{
    "FormatVersion": "OOS-2019-06-01",
    "Parameters": {
        "DiskId": {
            "Description": "the disk id of the snap shot to copy ",
            "Type": "String"
        },
        "InstanceId": {
            "Description": "the instances id  of the snap shot to copy ",
            "Type": "String"
        },
        "SnapshotName": {
            "Description": "snap shot name of the new snap",
            "Type": "String"
        }
    },
    "Tasks": [
        {   
            "Name": "checkInstanceReady",
            "Action": "ACS::CheckFor",
            "Properties": {
                "Service": "ECS",
                "API": "DescribeInstances",
                "DesiredValues": ["Running", "Stopped"],
                "Parameters": {
                    "InstanceIds": ["{{ InstanceId }} "]
                },
                "PropertySelector": "Instances.Instance[].Status"
            }
        },
        {   
            "Name": "createSnapshot",
            "Action": "ACS::ExecuteAPI",
            "Properties": {
                "Service": "ECS",
                "API": "CreateSnapshot",
                "Parameters": {
                    "DiskId": "{{ DiskId }}",
                    "SnapshotName": "{{ SnapshotName }}"
                }
            },
            "Outputs": {
                "SnapshotId": {
                    "Type": "String",
                    "ValueSelector": "SnapshotId"
                }
            }
        },
        {   
            "Name": "waitSnapshotsReady",
            "Action": "ACS::WaitFor",
            "Properties": {
                "Service": "ECS",
                "API": "DescribeSnapshots",
                "DesiredValues": ["accomplished"],
                "Parameters": {
                    "SnapshotIds": ["{{ createSnapshot.SnapshotId }}"]
                },
                "PropertySelector": "Snapshots.Snapshot[].Status"
            }
        }
    ],
    "Outputs": {
        "SnapshotId": {
            "Type": "String",
            "Value": "{{ createSnapshot.SnapshotId }}"
        }
    }
}

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用法

語(yǔ)法

示例