tencent cloud

Cloud Load Balancer

Release Notes and Announcements
CLB Release Notes
Product Announcements
Product Introduction
Overview
Strengths
Use Cases
Principles
Product Comparison
Use Limits
Service Regions and Service Providers
Purchase Guide
Billing Overview
Billing
CLB Resource Package
Purchase Methods
Payment Overdue
Product Attribute Selection
Getting Started
Getting Started with Domain Name-Based CLB
Getting Started with CLB
Getting Started with IPv6 CLB
Deploying Nginx on CentOS
Deploying Java Web on CentOS
Operation Guide
CLB Instance
CLB Listener
Real Server
Health Check
Certificate Management
Log Management
Monitoring and Alarm
Cloud Access Management
Classic CLB
Practical Tutorial
Deploy certificate to CLB (mutual authentication)
Enabling Gzip Compression & Testing
HTTPS Forwarding Configurations
Obtaining Real Client IPs
Best Practices for Configuring Load Balancing Monitoring Alerts
Implementing HA Across Multiple AZs
Load Balancing Algorithm Selection and Weight Configuration Examples
Configuring WAF protection for CLB listening domain names
Configure IAP to authenticate web access to the CLB domain and path
Configure IAP to authenticate programmatic access to CLB's domain and path
Ops Guide
Solution to Excessive Clients in TIME_WAIT Status
Load Balancer HTTPS Service Performance Test
Stress Testing FAQ
CLB Certificate Operation Permissions
Troubleshooting
UDP Health Check Exception
API Documentation
History
Introduction
API Category
Instance APIs
Listener APIs
Backend Service APIs
Target Group APIs
Redirection APIs
Other APIs
Classic CLB APIs
Load Balancing APIs
Making API Requests
Data Types
Error Codes
CLB API 2017
FAQs
Billing
CLB Configuration
Troubleshooting Health Check Issues
HTTPS
WS/WSS Protocol Support
HTTP/2 Protocol Support
Default Domain Name Blocking Prompt
Service Level Agreement
Contact Us
Glossary

RegisterTargets

PDF
Focus Mode
Font Size
Last updated: 2026-01-13 21:46:46

1. API Description

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

This API is used to bind one or more backend services to a Cloud Load Balancer listener or layer-7 forwarding rule. Before that, you need to create a related CLB layer-4 listener or layer-7 forwarding rule. For Layer-4 listeners (TCP/UDP), only specify the listener ID. For layer-7 (HTTP/HTTPS) listeners, forwarding rules must be specified through LocationId or Domain+Url.
This API is used to perform asynchronous operations. After it returns a successful result, call the DescribeTaskStatus API with the returned RequestID as an input parameter to check whether this task is successful.

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: RegisterTargets.
Version Yes String Common Params. The value used for this API: 2018-03-17.
Region Yes String Common Params. For more information, please see the list of regions supported by the product.
LoadBalancerId Yes String CLB instance ID
ListenerId Yes String CLB listener ID
Targets.N Yes Array of Target List of real servers to be bound. Array length limit: 20.
LocationId No String Specifies the forwarding rule ID, which can be obtained through the DescribeListeners API (https://www.tencentcloud.com/document/product/214/30686?from_cn_redirect=1). you must provide this parameter or either Domain or Url when binding a backend service to a layer-7 forwarding rule.
Domain No String Target forwarding rule domain name. This parameter does not take effect if LocationId is specified.
Url No String Target forwarding rule URL. This parameter does not take effect if LocationId is specified.

3. Output Parameters

Parameter Name Type Description
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 Registering CVM to a TCP Listener

Input Example

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

{
    "LoadBalancerId": "lb-cuxw2rm0",
    "ListenerId": "lbl-d1ubsydq",
    "Targets": [
        {
            "InstanceId": "ins-dm4xtz0i",
            "Port": 233,
            "Weight": 10
        }
    ]
}

Output Example

{
    "Response": {
        "RequestId": "898b431c-2745-4b27-80f6-e6e8038a0683"
    }
}

Example2 Registering CVM to the Forwarding Rule of an HTTP Listener (with the Rule Specified by LocationId)

Input Example

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

{
    "LoadBalancerId": "lb-cuxw2rm0",
    "ListenerId": "lbl-d1ubsydq",
    "LocationId": "loc-r2q3jd4c",
    "Targets": [
        {
            "InstanceId": "ins-dm4xtz0i",
            "Port": 233,
            "Weight": 10
        }
    ]
}

Output Example

{
    "Response": {
        "RequestId": "d4846a22-e758-407f-a526-db3f2d37d00e"
    }
}

Example3 Registering CVM to the Forwarding Rule of an HTTP Listener (with the Rule Specified by Domain and Url)

Input Example

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

{
    "LoadBalancerId": "lb-cuxw2rm0",
    "ListenerId": "lbl-d1ubsydq",
    "Domain": "foo.net",
    "Url": "/bar8",
    "Targets": [
        {
            "InstanceId": "ins-dm4xtz0i",
            "Port": 233,
            "Weight": 10
        }
    ]
}

Output Example

{
    "Response": {
        "RequestId": "11b4338f-2d00-4766-bc67-581d959b3488"
    }
}

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

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
FailedOperation Operation failed.
FailedOperation.ResourceInOperating The specified resource is currently being operated. Please try again later.
InternalError Internal error.
InvalidParameter Parameter error.
InvalidParameter.FormatError Wrong parameter format.
InvalidParameterValue Incorrect parameter value.
InvalidParameterValue.Duplicate Duplicate parameter value.
InvalidParameterValue.Length Wrong parameter length.
LimitExceeded Quota exceeded.
MissingParameter Missing parameter.
ResourceInsufficient Insufficient resources.
UnauthorizedOperation Unauthorized operation.

Help and Support

Was this page helpful?

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

Feedback