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    Auto Scaling:EnableScalingGroup

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    Auto Scaling:EnableScalingGroup

    Last Updated:Aug 27, 2026

    Enables a scaling group that is in the Disabled state and has an instance configuration source, such as a launch template or scaling configuration. After the scaling group is enabled, Auto Scaling dynamically adjusts the number of instances based on your business requirements.

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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:EnableScalingGroup

    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-bp14wlu85wrpchm0****
    ActiveScalingConfigurationId

    string

    No

    The ID of the scaling configuration that you want to enable in the scaling group.

    asc-bp1ffogfdauy0nu5****
    LaunchTemplateId

    string

    No

    The ID of the launch template used to create ECS instances.

    lt-m5e3ofjr1zn1aw7****
    LaunchTemplateVersion

    string

    No

    The version number of the launch template. Valid values:

    • A fixed template version number.

    • Default: The default template version is always used.

    • Latest: The latest template version is always used.

    Default
    InstanceIds

    array

    No

    The IDs of the ECS instances that you want to add to the scaling group after the scaling group is enabled.

    Before you add ECS instances to the scaling group, make sure that the instances meet the following requirements:

    • The instances must reside in the same region as the scaling group.

    • The instances must be in the Running state.

    • The instances do not belong to another scaling group.

    • The instances are billed on a subscription or pay-as-you-go basis, or the instances are preemptible instances.

    • If you specify VswitchID for the scaling group, the instances must share the same VPC as the scaling group.

    • If you do not specify VswitchID for the scaling group, the instances must use the classic network.

    string

    No

    The ID of the ECS instance that you want to add to the scaling group after the scaling group is enabled.

    Before you add an ECS instance to the scaling group, make sure that the instance meets the following requirements:

    • The instance must reside in the same region as the specified scaling group.

    • The instance must be in the Running state.

    • The instance does not belong to another scaling group.

    • The instance is billed on a subscription or pay-as-you-go basis, or the instance is a preemptible instance.

    • If you specify VswitchID for the scaling group, the instance must share the same VPC as the scaling group.

    • If you do not specify VswitchID for the scaling group, the instance must use the classic network.

    i-283vv****

    LoadBalancerWeights

    array

    No

    The weights of ECS instances or elastic container instances as backend servers.

    Default value: 50.

    integer

    No

    The weight of an ECS instance or elastic container instance as a backend server.

    Default value: 50.

    50
    LaunchTemplateOverrides

    array<object>

    No

    The instance types to extend in the launch template.

    object

    No

    Details of the instance types specified in the extended launch template configurations.

    InstanceType

    string

    No

    The instance type. To scale instances based on instance type weights, you must also specify LaunchTemplateOverrides.WeightedCapacity.

    This parameter overwrites the instance type specified in the launch template.

    Note

    This parameter takes effect only if you specify LaunchTemplateId.

    You can use this parameter to specify any instance type available for purchase.

    ecs.c5.xlarge
    WeightedCapacity

    integer

    No

    The weight of the instance type. To scale instances based on instance type weights, specify this parameter together with LaunchTemplateOverrides.InstanceType.

    The weight represents the capacity of a single instance of the specified type in the scaling group. A higher weight means fewer instances are needed to meet the expected capacity.

    Because performance metrics such as vCPUs and memory vary by instance type, you can assign different weights to match your business requirements.

    Example:

    • Current capacity: 0

    • Expected capacity: 6

    • Capacity of ecs.c5.xlarge: 4

    To reach the expected capacity, Auto Scaling must scale out two instances of ecs.c5.xlarge.

    Note

    The scaling group capacity cannot exceed the sum of MaxSize and the maximum weight among all instance types.

    Valid values of WeightedCapacity: 1 to 500.

    4
    RegionId

    string

    No

    The region ID of the scaling group.

    cn-qingdao

    Response elements

    Element

    Type

    Description

    Example

    object

    RequestId

    string

    The ID of the request.

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

    Examples

    Success response

    JSON format

    {
  "RequestId": "473469C7-AA6F-4DC5-B3DB-A3DC0DE3****"
}

    Error codes

    See Error Codes for a complete list.

    Release notes

    See Release Notes for a complete list.