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Auto Scaling:ExecuteScalingRule

Last Updated:Jun 06, 2024

Executes a scaling rule.

Operation description

Before you call this operation, take note of the following items:

  • The scaling group is in the Active state.
  • No scaling activities in the scaling group are in progress.

If no scaling activities in the scaling group are in progress, the operation can trigger scaling activities even before the cooldown time expires.

A successful call indicates that Auto Scaling accepts the request. However, the scaling activity may still fail. You can obtain the status of a scaling activity by using the value of the ScalingActivityId parameter in the response.

If the addition of a specified number of Elastic Compute Service (ECS) instances to a scaling group causes the total number of ECS instances in the scaling group to exceed the maximum number of instances allowed, Auto Scaling adds only a specific number of ECS instances to ensure that the total number of instances is equal to the maximum number of instances.

If the removal of a specified number of ECS instances from a scaling group causes the total number of ECS instances in the scaling group to drop below the minimum number of instances allowed, Auto Scaling removes only a specific number of ECS instances to ensure that the total number of instances is equal to the minimum number of instances.

You can specify only a limited number of ECS instances in each adjustment. For more information, see the description of the AdjustmentValue parameter in the CreateScalingRule topic.

Debugging

OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer.

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 Resources is 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.
OperationAccess levelResource typeCondition keyAssociated operation
ess:ExecuteScalingRuleWrite
  • ScalingGroup
    acs:ess:{#regionId}:{#accountId}:scalinggroup/{#ScalingGroupId}
    none
none

Request parameters

ParameterTypeRequiredDescriptionExample
ScalingRuleAristringYes

The unique identifier of the scaling rule.

Note You can call the ExecuteScalingRule operation to execute only simple scaling rules and step scaling rules. To execute a step scaling rule, you must specify the BreachThreshold and MetricValue parameters.
ari:acs:ess:cn-hangzhou:140692647406****:scalingrule/asr-bp1dvirgwkoowxk7****
ClientTokenstringNo

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 ensure 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 How to ensure idempotence.

123e4567-e89b-12d3-a456-426655440000
BreachThresholdfloatNo

The threshold specified when the step scaling rule is executed. Valid values: -9.999999E18 to 9.999999E18.

1.0
MetricValuefloatNo

The metric value specified when the step scaling rule is executed. Valid values: -9.999999E18 to 9.999999E18.

1.0
RegionIdstringNo

The region ID of the scaling group.

cn-qingdao

Response parameters

ParameterTypeDescriptionExample
object
ScalingActivityIdstring

The ID of the scaling activity.

asa-bp13o672yeautiil****
RequestIdstring

The ID of the request.

473469C7-AA6F-4DC5-B3DB-A3DC0DE3C83E

Examples

Sample success responses

JSONformat

{
  "ScalingActivityId": "asa-bp13o672yeautiil****",
  "RequestId": "473469C7-AA6F-4DC5-B3DB-A3DC0DE3C83E"
}

Error codes

For a list of error codes, visit the Service error codes.

Change history

Change timeSummary of changesOperation
No change history