Attaches Application Load Balancer (ALB) 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 AttachAlbServerGroups operation. By attaching ALB 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.
Operation description
Before you call the operation to attach an ALB server group to your scaling group, make sure that the following requirements are met:
- The scaling group and the ALB server group share the same virtual private cloud (VPC).
- The ALB server group is in the Available state.
Debugging
Authorization information
The following table shows the authorization information corresponding to the API. The authorization information can be used in the Action policy element to grant a RAM user or RAM role the permissions to call this API operation. Description:
- Operation: the value that you can use in the Action element to specify the operation on a resource.
- Access level: the access level of each operation. The levels are read, write, and list.
- Resource type: the type of the resource on which you can authorize the RAM user or the RAM role to perform the operation. Take note of the following items:
- The required resource types are displayed in bold characters.
- If the permissions cannot be granted at the resource level,
All Resourcesis used in the Resource type column of the operation.
- Condition Key: the condition key that is defined by the cloud service.
- Associated operation: other operations that the RAM user or the RAM role must have permissions to perform to complete the operation. To complete the operation, the RAM user or the RAM role must have the permissions to perform the associated operations.
| Operation | Access level | Resource type | Condition key | Associated operation |
|---|---|---|---|---|
| ess:AttachAlbServerGroups | update |
|
| none |
Request parameters
| Parameter | Type | Required | Description | Example |
|---|---|---|---|---|
| RegionId | string | Yes | The region ID of the scaling group. Examples: | cn-hangzhou |
| ScalingGroupId | string | Yes | The ID of the scaling group. | asg-bp18p2yfxow2dloq**** |
| 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 in the scaling group to the ALB server group. Valid values:
Default value: false. | false |
| AlbServerGroups | array<object> | Yes | The information about the ALB server groups. | |
| object | Yes | Details of the ALB server group. | ||
| AlbServerGroupId | string | Yes | The ID of the ALB server group. You can attach only a limited number of ALB server groups to a scaling group. To view the predefined quota limit or manually request a quota increase, go to Quota Center. | sgp-ddwb0y0g6y9bjm**** |
| Weight | integer | Yes | The weight of an ECS instance or elastic container instance after being added as a backend server to the ALB 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 you assign zero weight to an instance, the instance is allocated no access requests. | 100 |
| Port | integer | Yes | The port used by ECS instances or elastic container instances after being added as backend servers to the ALB server group. Valid values: 1 to 65535. | 22 |
Response parameters
Examples
Sample success responses
JSONformat
{
"ScalingActivityId": "asa-2ze6wxj8vsohn6j9****",
"RequestId": "473469C7-AA6F-4DC5-B3DB-A3DC0DE3****"
}Error codes
For a list of error codes, visit the Service error codes.
Change history
| Change time | Summary of changes | Operation |
|---|