Product Introduction

Overview

Strengths

Scenarios

Service Limits

Access Management

Purchase Guide

Getting Started

Creating a Scaling Plan in 5 Minutes

Step 1:Creating a Launch Configuration

Step 2:Creating a Scaling Group

Step 3:Creating a Scaling Policy

Tutorial

Creating Web Services

Creating High-performance Computing Cluster

Creating Servers for Sending Requests

Configuring For High Availability Services

Launch Configuration

Launch Configuration Overview

Creating a Launch Configuration

Viewing Launch Configuration List

Modifying Launch Configurations

Exception Detection

Scaling Groups

Scaling Group Overview

Creating a Scaling Group

Viewing Scaling Group List

Modifying Scaling Groups

Modifying Bound Instances

Adding CLBs

Delete scaling group

Creating Notifications

Creating Scaling Activity Notifications

Specifying Notification Recipients

Expanding and Reducing Capacity

Auto Scaling Lifecycle Hook

Managing Scheduled Actions

Managing an Alarm-triggered Policy

Instance Health Check

Expanding Capacity Manually

Scale-in Process

Viewing Scaling Activities

Suspending and Resuming Scaling

Scale-in Removal Protection

Scaling Activity Cancelled

Scaling Activity Failed

Cooldown Period

Monitoring

Monitor Alarm Metrics

Running Status Check

Scheduled Task

Scheduled Task Execution Time Description

Troubleshooting

Scaling Group Doesn't Work

Scaling Activity Failed

Use Cases

Setting a Fixed Outbound IP Address for Scaling Groups

Deploying Elastic Web Application Service

Enabling Services Upon CVM Start-up

Customer Cases

iCarbonX

API Documentation

History

Introduction

API Category

Making API Requests

Scaling Group APIs

Scaling Group Instances APIs

Launch Configuration APIs

Scheduled Action APIs

Alarm Trigger Policy APIs

Notification APIs

Lifecycle Hook APIs

Instance Refresh APIs

Other APIs

Data Types

Error Codes

FAQs

Glossary

ScaleInInstances

PDF

Focus Mode

Font Size

Last updated: 2025-10-30 21:28:12

1. API Description

Domain name for API request: as.intl.tencentcloudapi.com.

This API is used to reduce the specified number of instances from the scaling group.

There is no on going scaling task.
This API is valid even when the scaling group is disabled. For more details, see DisableAutoScalingGroup.
You can specify the instances to remove in the scale-in activity by using TerminationPolicies. For more information, see Scaling In Policies.
Only the IN_SERVICE instances will be reduced. To reduce instances in other statues, use the DetachInstances or RemoveInstances API.
The desired capacity will be reduced accordingly. The new desired capacity should be no less than the minimum capacity.
If the scale-in activity failed or partially succeeded, the final desired capacity only deducts the instances that have been reduced successfully.

A maximum of 20 requests can be initiated per second for this API.

We recommend you to use API Explorer

Try it

API Explorer provides a range of capabilities, including online call, signature authentication, SDK code generation, and API quick search. It enables you to view the request, response, and auto-generated examples.

2. Input Parameters

The following request parameter list only provides API request parameters and some common parameters. For the complete common parameter list, see Common Request Parameters.

Parameter Name	Required	Type	Description
Action	Yes	String	Common Params. The value used for this API: ScaleInInstances.
Version	Yes	String	Common Params. The value used for this API: 2018-04-19.
Region	Yes	String	Common Params. For more information, please see the list of regions supported by the product.
AutoScalingGroupId	Yes	String	Scaling group ID. obtain available scaling group ids in the following ways:. Query the scaling group ID by logging in to the console. . Specifies the scaling group ID obtained by calling the api DescribeAutoScalingGroups and retrieving the AutoScalingGroupId from the return information. .
ScaleInNumber	Yes	Integer	Number of resource instances to scale in. this parameter has a static value range of [1,2000] and must not be larger than the difference between the desired number and the minimum value. for example, if the scaling group desired number is 100 and the minimum value is 20, the permissible range is [1,80].

3. Output Parameters

Parameter Name	Type	Description
ActivityId	String	Scaling activity ID
RequestId	String	The unique request ID, generated by the server, will be returned for every request (if the request fails to reach the server for other reasons, the request will not obtain a RequestId). RequestId is required for locating a problem.

4. Example

Example1 This example shows you how to reduce one instance from the scaling group.

Input Example

POST / HTTP/1.1
Host: as.intl.tencentcloudapi.com
Content-Type: application/json
X-TC-Action: ScaleInInstances
&<Common request parameters>

{
    "AutoScalingGroupId": "asg-12yqet78",
    "ScaleInNumber": 1
}

Output Example

{
    "Response": {
        "ActivityId": "asa-n6w01f6m",
        "RequestId": "c0bb46ea-2b47-471c-9099-e20bf7a23078"
    }
}

5. Developer Resources

SDK

TencentCloud API 3.0 integrates SDKs that support various programming languages to make it easier for you to call APIs.

Command Line Interface

Tencent Cloud CLI 3.0

6. Error Code

The following only lists the error codes related to the API business logic. For other error codes, see Common Error Codes.

Error Code	Description
InvalidParameter.ActionNotFound	Invalid Action request.
InvalidParameterValue.InvalidAutoScalingGroupId	Invalid scaling group ID.
InvalidParameterValue.Range	The value is outside the specified range.
MissingParameter	Parameter missing.
ResourceInsufficient.AutoScalingGroupBelowMinSize	The number of instances in the auto scaling group is below the minimum value.
ResourceNotFound.AutoScalingGroupNotFound	The scaling group does not exist.
ResourceUnavailable.AutoScalingGroupInActivity	The auto scaling group is active.

Help and Support

Was this page helpful?

You can also Contact sales or Submit a Ticket for help.

Help us improve! Rate your documentation experience in 5 mins.

Feedback

tencent cloud

Auto Scaling