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 the UserData messages. Valid values:
  • EnabledIfCreateStack: displays progress events when you are creating the stack.
  • Disabled: does not display progress events.

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 that is 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": {}
    }