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Auto Scaling:EnterStandby

Last Updated:Jun 06, 2024

Puts an Elastic Compute Service (ECS) instance into the Standby state.

Operation description

Description

  • If you call the operation to put an ECS instance in a scaling group that is associated with a Classic Load Balancer (CLB) instance into the Standby state, the weight of the ECS instance as a backend server of the CLB instance is set to 0.
  • You can remove an instance that is in the Standby state from a scaling group, and then release the instance.
  • ECS instances that are in the Standby state are not removed from the scaling group during scale-in activities triggered by event-triggered tasks.
  • If Auto Scaling considers an ECS instance that is in the Standby state unhealthy, for example, the ECS instance is being stopped or being restarted, Auto Scaling does not update the health status of the ECS instance or trigger scale-in activities to remove the ECS instance from the scaling group. Auto Scaling updates the health status of the ECS instance only when the ECS instance is no longer in the Standby state.

Debugging

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

Authorization information

There is currently no authorization information disclosed in the API.

Request parameters

ParameterTypeRequiredDescriptionExample
ScalingGroupIdstringYes

The ID of the scaling group.

asg-bp1fo0dbtsbmqa9h****
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-a456-42665544****
InstanceIdsarrayYes

The IDs of the ECS instances.

stringYes

The IDs of the ECS instances.

i-28wt4****
AsyncbooleanNo

Specifies whether to asynchronously put the ECS instance into the Standby state. Valid values:

  • true
  • false

Default value: false.

false

Response parameters

ParameterTypeDescriptionExample
object
RequestIdstring

The ID of the request.

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

The ID of the scaling activity.

asa-2zeb04oym05qaceq****

Examples

Sample success responses

JSONformat

{
  "RequestId": "473469C7-AA6F-4DC5-B3DB-A3DC0DE3****",
  "ScalingActivityId": "asa-2zeb04oym05qaceq****"
}

Error codes

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

Change history

Change timeSummary of changesOperation
No change history
HTTP status codeError codeError messageDescription
403Forbidden.UnauthorizedA required authorization for the specified action is not supplied.The error message returned because the RAM user is not authorized to call this operation. Contact the Alibaba Cloud account for the authorization and try again.
404InvalidInstanceId.NotFoundInstance “XXX” does not exist.The error message returned because the specified ECS instance does not exist.
404InvalidScalingGroupId.NotFoundThe specified scaling group does not exist.The error message returned because the specified scaling group does not exist.