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) or Network Load Balancer (NLB) 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.
Debugging
Request parameters
Parameter | Type | Required | Example | Description |
Action | String | Yes | AttachServerGroups | The operation that you want to perform. Set the value to AttachServerGroups. |
RegionId | String | Yes | cn-hangzhou | The region ID of the scaling group. |
ScalingGroupId | String | Yes | asg-bp18p2yfxow2dloq**** | The ID of the scaling group. |
ClientToken | String | No | 123e4567-e89b-12d3-a456-42665544**** | The client token that is used to ensure the idempotence of the request. You can use the client to generate the value, but you must make sure that the value 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. |
ForceAttach | Boolean | No | false | Specifies whether to add the existing Elastic Compute Service (ECS) instances or elastic container instances in the scaling group to server group N. Valid values:
Default value: false. |
ServerGroup.N.ServerGroupId | String | Yes | sgp-60ofsqhwer0b*** | The ID of server group N. |
ServerGroup.N.Type | String | Yes | ALB | The type of server group N. Valid values:
|
ServerGroup.N.Weight | Integer | Yes | 100 | The weight of an ECS instance or elastic container instance as a backend server of server group N. 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 you assign zero weight to an instance, the instance is allocated no access requests. |
ServerGroup.N.Port | Integer | Yes | 22 | The port used by ECS instances or elastic container instances after being added as backend servers to server group N. Valid values: 1 to 65535. |
Response parameters
Parameter | Type | Example | Description |
ScalingActivityId | String | asa-bp1c9djwrgxjyk31**** | The ID of the scaling activity. During the scaling activity, server group N is attached to the scaling group and the existing ECS instances or elastic container instances in the scaling group are added to server group N. Note This parameter is returned only if you set |
RequestId | String | 74C4E313-8570-479F-8791-DC25360D**** | The request ID. |
Examples
Sample requests
http(s)://ess.aliyuncs.com/?Action=AttachServerGroups
&RegionId=cn-hangzhou
&ScalingGroupId=asg-bp18p2yfxow2dloq****
&ClientToken=123e4567-e89b-12d3-a456-42665544****
&ForceAttach=false
&ServerGroup=[{"ServerGroupId":"sgp-60ofsqhwer0b***","Type":"ALB","Weight":100,"Port":22}]
&<Common request parameters>Sample success responses
XML format
HTTP/1.1 200 OK
Content-Type:application/xml
<AttachServerGroupsResponse>
<ScalingActivityId>asa-bp1c9djwrgxjyk31****</ScalingActivityId>
<RequestId>74C4E313-8570-479F-8791-DC25360D****</RequestId>
</AttachServerGroupsResponse>JSON format
HTTP/1.1 200 OK
Content-Type:application/json
{
"ScalingActivityId" : "asa-bp1c9djwrgxjyk31****",
"RequestId" : "74C4E313-8570-479F-8791-DC25360D****"
}Error codes
For a list of error codes, see Service error codes.