Binding Scaling Groups With CVM

Last updated: 2020-06-04 16:20:47


    This is a legacy API which has been hidden and will no longer be updated. We recommend using the new Auto Scaling API 3.0 which is standardized and faster.

    1. API Description

    This API (AttachInstance) is used to add a CVM instance to a specified scaling group.
    Domain for API request:

    1) The added CVM instance needs to meet the following conditions:
    The added CVM instance must be in the same region as the scaling group.
    The specifications of the added CVM instances must be exactly the same as those of the instance bound scaling configuration.
    The status of the added CVM instance must be "Running".
    The added CVM instance can not be one already added to other scaling groups.

    2) This function can be performed when the scaling group is in active status.

    3) This function can only be performed when the scaling group is not performing a scaling activity.

    4) This function can be performed directly without the cooldown period when the scaling group has no scaling activity being performed.

    5) If the number of instances specified by this function plus the number of instances of the current scaling group is greater than the maximum group size specified by the scaling group, the call fails.

    6) The manually added CVM instance is not associated with the scaling configuration in effect in scaling group.

    2. Input Parameters

    The following request parameter list only provides API request parameters. Common request parameters need to be added when the API is called. For more information, refer to Common Request Parameters. The Action field for this API is AttachInstance.

    Parameter Name Required Type Description
    scalingGroupId Yes String Scaling group ID of CVM instance to be bound. It can be queried by calling Query Scaling Group List (DescribeScalingGroup) API.
    instanceIds.n Yes String CVM instance ID to be bound. Please fill in the unInstanceId (unified ID of CVM) field returned in the API Query Instance List (DescribeInstances), and a scaling group can bind up to 20 CVM instances.

    3. Output Parameters

    Parameter Name Type Description
    code Int Common error code; 0: Succeeded; other values: Failed. For more information, please refer to Common Error Codes on the Error Code page.
    codeDesc String Error code at business side. If the task succeeds, it will return "Success"; if the task fails, the specific business error reason will be returned.
    message String Module error message description depending on API.

    4. Error Codes

    The following error codes only include the business logic error codes for this API. For additional common error codes, refer to AS Error Code.

    Error Code Description
    IncorrectInstanceStatus.InOtherScalingGroup The CVM has been bound in other scaling groups
    InvalidParameter.ScalingGroupIdError Incorrect scalingGroupId
    InvalidParameter.InstanceIdError Incorrect instanceId
    InvalidInstanceId.ScallingConfigurationMismatch The bound CVM does not match the scaling group configuration
    InvalidParameter.InvalidProjectId The project ID to which the resource belongs is not the default project

    5. Example
    &<Common request parameters>

    Example of returned result is as follows. The code is 0, indicating that the bind is successfully.


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