Call AttachServerGroups to attach server groups to a scaling group - Auto Scaling - Alibaba Cloud - Auto Scaling

Attaches server groups to a scaling group. To seamlessly adjust the number of instances in response to changes in your business workload or to maintain the uninterrupted accessibility of your application, you can call the AttachServerGroups operation. By attaching Application Load Balancer (ALB), Network Load Balancer (NLB), or Gateway Load Balancer (GWLB) server groups to your scaling group, this operation enables Auto Scaling to automatically tailor your computing capacity to your business needs. Furthermore, it optimizes traffic routing by dynamically allocating incoming requests based on current workload patterns, which significantly improves the stability and performance of your application.

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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:AttachServerGroups

update

*ScalingGroup

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

None

Request parameters

Parameter	Type	Required	Description	Example
RegionId	string	Yes	The region ID of the scaling group.	cn-hangzhou
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 Ensure idempotence.	123e4567-e89b-12d3-a456-42665544****
ForceAttach	boolean	No	Specifies whether to add the existing Elastic Compute Service (ECS) instances or elastic container instances (ECI) in the scaling group to the server group. Valid values: true false Default value: false.	false
ServerGroups	array<object>	Yes	The information about the server groups.
	object	No	The information about the server group.
ServerGroupId	string	Yes	The ID of the server group.	sgp-5yc3bd9lfyh*****
Type	string	Yes	The type of the server group. Valid Values: ALB NLB GWLB	ALB
Weight	integer	No	The weight of an ECS or ECI instance as a backend server of the server group. Valid values: 0 to 100 If you assign a higher weight to an instance, the instance is allocated a larger proportion of access requests. If the weight is 0, the ECS or ECI instance does not receive access requests. Note For ALB and NLB types, this parameter is required. GWLB type cannot be set.	100
Port	integer	No	The port used by ECS or ECI instances after being added as backend servers to the server group. Valid values: 1 to 65535. Note For ALB and NLB types, this parameter is required. GWLB type cannot set this parameter and the default value is 6081.	22

Response elements

Element	Type	Description	Example
	object
ScalingActivityId	string	The ID of the scaling activity. During the scaling activity, the server group is attached to the scaling group and the existing ECS instances or elastic container instances in the scaling group are added to the server group. Note This parameter is returned only if you set ForceAttach to true.	asa-bp1c9djwrgxjyk31****
RequestId	string	The ID of the request.	473469C7-AA6F-4DC5-B3DB-A3DC0DE3****

Examples

Success response

JSON format

{
  "ScalingActivityId": "asa-bp1c9djwrgxjyk31****",
  "RequestId": "473469C7-AA6F-4DC5-B3DB-A3DC0DE3****"
}

Error codes

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.