ALIYUN::ROS::WaitCondition - Resource Orchestration Service

ALIYUN::ROS::WaitCondition is used to wait signals. You can use ALIYUN::ROS::WaitCondition together with ALIYUN::ROS::WaitConditionHandle to manage the execution process of a stack. When you create an Elastic Compute Service (ECS) instance, a signal is sent during the execution of the user data.

Syntax

{
  "Type": "ALIYUN::ROS::WaitCondition",
  "Properties": {
    "Count": Number,
    "Handle": String,
    "Timeout": Number,
    "ShowProgressEvent": String
  }
}

Properties

Property	Type	Required	Editable	Description	Constraint
Handle	String	Yes	No	The reference to an instance that is created by using ALIYUN::ROS::WaitConditionHandle.	None.
Timeout	Number	Yes	No	The timeout period that is allowed to receive UserData messages.	Valid values: 1 to 43200. Unit: seconds.
Count	Number	No	Yes	The total number of UserData messages that Resource Orchestration Service (ROS) receives.	None.
ShowProgressEvent	String	No	No	Specifies whether to display progress events that represent the receiving progress of UserData messages.	Valid values: Disabled (default): does not display progress events. Enabled: displays progress events. EnabledIfCreateStack (not recommended): displays progress events when you are creating the stack.

Return values

Fn::GetAtt

Data: a JSON string that contains the signal data last created or updated.
JoinedErrorData: a string that contains the content of ErrorData.
ErrorData: a JSON string that contains the error signal data last created or updated.

Examples

YAML format

ROSTemplateFormatVersion: '2015-09-01'
Description: ''
Parameters: {}
Outputs: {}
Resources:
  InstallNginx:
    Type: 'ALIYUN::ECS::RunCommand'
    Properties:
      Type: RunShellScript
      CommandContent:
        'Fn::Replace':
          - ros-notify:
              'Fn::GetAtt':
                - InstallNginxWaitConditionHandle
                - CurlCli
          - |
            #!/bin/sh
            yum install -y nginx
            systemctl restart nginx
            if [[ $? -eq 0 ]];
            then
            ros-notify -d "{\"status\" : \"SUCCESS\"}"
            else
            ros-notify -d "{\"status\" : \"FAILURE\"}"
            fi
      Name: InstallNginxScript
      InstanceIds:
        - i-wz995r4yn8njthoq****
      Timeout: 60
  InstallNginxWaitConditionHandle:
    Type: 'ALIYUN::ROS::WaitConditionHandle'
  InstallNginxWaitCondition:
    Type: 'ALIYUN::ROS::WaitCondition'
    Properties:
      Handle:
        Ref: InstallNginxWaitConditionHandle
      Timeout: 60
Metadata: {}

JSON format

{
  "ROSTemplateFormatVersion": "2015-09-01",
  "Description": "",
  "Parameters": {},
  "Outputs": {},
  "Resources": {
    "InstallNginx": {
      "Type": "ALIYUN::ECS::RunCommand",
      "Properties": {
        "Type": "RunShellScript",
        "CommandContent": {
          "Fn::Replace": [
            {
              "ros-notify": {
                "Fn::GetAtt": [
                  "InstallNginxWaitConditionHandle",
                  "CurlCli"
                ]
              }
            },
            "#!/bin/sh\nyum install -y nginx\nsystemctl restart nginx\nif [[ $? -eq 0 ]];\nthen \nros-notify -d \"{\\\"status\\\" : \\\"SUCCESS\\\"}\" \nelse \nros-notify -d \"{\\\"status\\\" : \\\"FAILURE\\\"}\" \nfi \n"
          ]
        },
        "Name": "InstallNginxScript",
        "InstanceIds": [
          "i-wz995r4yn8njthoq****"
        ],
        "Timeout": 60
      }
    },
    "InstallNginxWaitConditionHandle": {
      "Type": "ALIYUN::ROS::WaitConditionHandle"
    },
    "InstallNginxWaitCondition": {
      "Type": "ALIYUN::ROS::WaitCondition",
      "Properties": {
        "Handle": {
          "Ref": "InstallNginxWaitConditionHandle"
        },
        "Timeout": 60
      }
    }
  },
  "Metadata": {}
}