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    Auto Scaling:ExitStandby

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    Auto Scaling:ExitStandby

    Last Updated:Sep 10, 2026

    Transitions ECS instances in standby state within a scaling group to the running state.

    Operation description

    Operation description

    After instances in a scaling group are removed from standby state, note the following items:

    • The ECS instances or ECI instances transition to the running state (that is, recover to the in-service state).

    • If the scaling group that contains the ECS instances or ECI instances is associated with a load balancing instance, the weight of the ECS instances or ECI instances is set to 50 by default when they are added back to the load balancing instance.

    • If the ECS instances or ECI instances are stopped or restarted, their health check status is updated.

    • When a scale-in scaling activity is triggered in the scaling group, Auto Scaling can remove the ECS instances or ECI instances from the scaling group.

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    RAM authorization

    The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

    • Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.

    • API: The API that you can call to perform the action.

    • Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.

    • Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.

      • For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.

      • For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.

    • Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.

    • Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

    Action

    Access level

    Resource type

    Condition key

    Dependent action

    ess:ExitStandby

    update

    *ScalingGroup

    acs:ess:{#regionId}:{#accountId}:scalinggroup/{#ScalingGroupId}

    		 None None

    Request parameters

    Parameter

    Type

    Required

    Description

    Example
    ScalingGroupId

    string

    Yes

    The ID of the scaling group.

    asg-bp1fo0dbtsbmqa9h****
    ClientToken

    string

    No

    The client token that is used to ensure the idempotence of the request.

    You can use the client to generate the token, but you must make sure that the token is unique among different requests. The token can contain only ASCII characters and cannot exceed 64 characters in length. For more information, see How to ensure idempotence.

    123e4567-e89b-12d3-a456-42665544****
    InstanceId

    array

    Yes

    The ID of the ECS instance.

    i-28wt4****

    string

    No

    The ID of the ECS instance. The value can be a JSON array that consists of up to 20 instance IDs. Separate multiple instance IDs with commas (,).

    i-28wt4****
    Async

    boolean

    No

    Specifies whether to use an asynchronous task. Valid values:

    • true: The task is executed asynchronously.

    • false: The task is executed synchronously.

    Default value: false.

    false
    RegionId

    string

    No

    The region ID of the scaling group.

    cn-hangzhou

    Response elements

    Element

    Type

    Description

    Example

    object

    RequestId

    string

    The request ID.

    473469C7-AA6F-4DC5-B3DB-A3DC0DE3****
    ScalingActivityId

    string

    The scaling activity ID.

    asa-2zeb04oym05qaceq****

    Examples

    Success response

    JSON format

    {
  "RequestId": "473469C7-AA6F-4DC5-B3DB-A3DC0DE3****",
  "ScalingActivityId": "asa-2zeb04oym05qaceq****"
}

    Error codes

    See Error Codes for a complete list.

    Release notes

    See Release Notes for a complete list.