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

Glossary

Purchase Methods

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Last updated: 2026-03-25 19:55:50

Tencent Cloud allows you to purchase a CLB instance on the official purchase page or via API. The two methods are detailed below:
Purchasing a CLB Instance on the Official Purchase Page
You can purchase a CLB instance on Tencent Cloud official website. There are two types of Tencent Cloud accounts, namely the bill-by-IP account and bill-by-CVM account. The accounts created after 00:00:00 on June 17, 2020 are of the bill-by-IP type. If you have created your account before that time, you can check your account type in the console as instructed in Checking Account Type.
1. Log in to the Tencent Cloud console and go to the CLB purchase page.
2. Select the following CLB configuration items as needed:
Bill-by-IP account
Parameter
Description
Billing mode
Supports pay-as-you-go billing.
Region
Select a region. For more information on the regions supported by CLB, see Region List.
Instance type
Supports the CLB instance type only. Starting from October 20, 2021, classic CLB instances can no longer be purchased. For more information, see Classic CLB End-of-Sale Notice.
Network type
Supports two network types: public network and private network. For more information, see Network Types.
Public network: CLB is used to distribute requests from a public network.
Private network: CLB is used to distribute requests from the Tencent Cloud private network. A private network instance does not support the following configuration items, and therefore they are not displayed by default: EIP, IP version, ISP, instance specification, network billing mode, and bandwidth cap.
The supported network types vary by billing mode:
In pay-as-you-go billing mode, both the public and private network types are supported.
EIP
If EIP is not selected, Tencent Cloud will assign you a public network CLB instance whose public IP address cannot be changed.
If EIP is selected, Tencent Cloud will assign you an EIP and a private network CLB instance, which has the similar features of public network CLB. (Only pay-as-you-go public network CLB instances allow you to select an EIP.)
IP version
Supports the following CLB IP versions: IPv4, IPv6, and IPv6 NAT64. Only pay-as-you-go instances support the IPv6 version. For more information about other restrictions, see IP Versions. IPv6 CLB is currently in beta. To try it out, submit a ticket.
Network
CLB supports classic network and VPC.
The classic network is a public network resource pool for all Tencent Cloud users. The private IPs of all CVMs are assigned by Tencent Cloud. You cannot customize IP ranges or IP addresses.
A VPC is a logically isolated network space in Tencent Cloud. In a VPC, you can customize IP ranges, IP addresses, and routing policies.
A VPC is more suitable for use cases requiring custom configurations. Besides, the overall classic network products were officially discontinued on December 31, 2022. For details, see Ending Support for Classic Network. We recommend you choose a VPC.
ISP
Supports the following ISP types: BGP (multi-line), China Mobile, China Telecom, and China Unicom.
In pay-as-you-go billing mode, all of the above four options are supported. Currently, the static single-line IP is supported only in Guangzhou, Shanghai, Nanjing, Jinan, Hangzhou, Fuzhou, Beijing, Shijiazhuang, Wuhan, Changsha, Chengdu, and Chongqing. For the support information in other regions, see the console. If you want to try it out, contact the sales rep for application. Once your application is approved, you can select an ISP (China Mobile, China Unicom, or China Telecom) on the purchase page.
Primary/Secondary availability zone
The primary availability zone (AZ) is an AZ that currently sustains the traffic. The secondary AZ does not sustain traffic by default and will be used only when the primary AZ is unavailable. 
Instance specification
Supports shared and LCU-supported instances.
Shared instances guarantee performance according to their specifications. A single instance can sustain up to 50,000 concurrent connections, 5,000 new connections per second, and 5,000 queries per second.
An LCU-supported instances provide guaranteed performance according to specifications. A single instance can sustain up to ten million concurrent connections, 1 million new connections per second, and 300,000 queries per second.
Network billing mode
Supports the following network billing modes: bill-by-traffic and bandwidth package.
Bandwidth cap
The public network bandwidth cap of a shared CLB is 2 Gbps. For the private network bandwidth cap, it's suggested to set a value within 5 Gbps. 
The bandwidth cap of an LCU-supported CLB instance depends on the selected specification. For details, see Instance Specifications Comparison.
Project
Select a project.
Tag
Select a tag key and value. You can also create a tag as instructed in Creating Tags and Binding Resources.
Instance name
The name can contain up to 60 characters, including letters, numbers, hyphens, underscores, and dots. If it is not specified, a name will be automatically generated by default.
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Bill-by-CVM account
Parameter
Description
Billing mode
Supports pay-as-you-go billing only.
Region
Select a region. For more information on the regions supported by CLB, see Region List.
Instance type
Supports the CLB instance type only. Starting from October 20, 2021, classic CLB instances can no longer be purchased. For more information, see Classic CLB End-of-Sale Notice.
Network type
Supports two network types: public network and private network. For more information, see Network Types.
Public network: CLB is used to distribute requests from a public network.
Private network: CLB is used to distribute requests from the Tencent Cloud private network. A private network instance does not support the following configuration items, and therefore they are not displayed by default: IP version, ISP, and instance specification.
IP version
Supports the following CLB IP versions: IPv4, IPv6, and IPv6 NAT64. For more information about use limits, see IP Versions. IPv6 CLB is currently in beta. To try it out, submit a ticket.
Network
CLB supports classic network and VPC.
The classic network is a public network resource pool for all Tencent Cloud users. The private IPs of all CVMs are assigned by Tencent Cloud. You cannot customize IP ranges or IP addresses.
A VPC is a logically isolated network space in Tencent Cloud. In a VPC, you can customize IP ranges, IP addresses, and routing policies.
A VPC is more suitable for use cases requiring custom configurations. Besides, the overall classic network products were officially discontinued on December 31, 2022. For details, see Ending Support for Classic Network. We recommend you choose a VPC.
ISP
Supports the following ISP types: BGP (multi-line), China Mobile, China Telecom, and China Unicom.
Currently, the static single-line IP is supported only in Guangzhou, Shanghai, Nanjing, Jinan, Hangzhou, Fuzhou, Beijing, Shijiazhuang, Wuhan, Changsha, Chengdu, and Chongqing. This feature is in beta. To try it out, submit a ticket. For the support information in other regions, see the console. If you want to try this feature, contact the sales rep for application. Once your application is approved, you can select an ISP (China Mobile, China Unicom, or China Telecom) on the purchase page.
Instance specification
Supports shared and LCU-supported instances.
Shared instances guarantee performance according to their specifications. A single instance can sustain up to 50,000 concurrent connections, 5,000 new connections per second, and 5,000 queries per second.
An LCU-supported instances provide guaranteed performance according to specifications. A single instance can sustain up to Ten million concurrent connections, 1 million new connections per second, and 300,000 queries per second.
Project
Select a project.
Tag
Select a tag key and value. You can also create a tag as instructed in Creating Tags and Binding Resources.
Instance name
The name can contain up to 60 characters, including letters, numbers, hyphens, underscores, and dots. If it is not specified, a name will be automatically generated by default.
﻿
3. After completing the above configuration, confirm the quantity and fees and click Buy now.
Pay-as-you-go billing mode: In the Confirm pop-up window, click OK.
4. After successful purchase, CLB will be activated and you can configure and use the CLB instance.
Purchasing a shared instance
1. Log in to the Tencent Cloud console and go to the CLB purchase page.
2. Set the shared instance configuration items by referring to the steps in Purchasing a CLB Instance on the Official Purchase Page and select Shared for Instance specification.
﻿
3. Complete the subsequent operations by referring to the steps in Purchasing a CLB Instance on the Official Purchase Page.
Purchasing an LCU-supported instance
1. Log in to the Tencent Cloud console and go to the CLB purchase page.
2. Set the LCU-supported instance configuration items by referring to the steps in Purchasing a CLB Instance on the Official Purchase Page and select LCU-supported for Instance specification.
﻿
3. Complete the subsequent operations by referring to the steps in Purchasing a CLB Instance on the Official Purchase Page.
Purchasing a CLB Instance via an API
To purchase a CLB instance via an API, see CreateLoadBalancer.
Related Operations
You can create a listener for a CLB instance as instructed in CLB Listener Overview.
You can bind a CLB listener to a real server as instructed in Real Server Overview.
References
Product Attribution Selection

Help and Support

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Cloud Load Balancer

Purchase Methods

Purchasing a CLB Instance on the Official Purchase Page

Purchasing a shared instance

Purchasing an LCU-supported instance

Purchasing a CLB Instance via an API

Related Operations

References

Help and Support

Parameter	Description
Billing mode	Supports pay-as-you-go billing.
Region	Select a region. For more information on the regions supported by CLB, see Region List.
Instance type	Supports the CLB instance type only. Starting from October 20, 2021, classic CLB instances can no longer be purchased. For more information, see Classic CLB End-of-Sale Notice.
Network type	Supports two network types: public network and private network. For more information, see Network Types. Public network: CLB is used to distribute requests from a public network. Private network: CLB is used to distribute requests from the Tencent Cloud private network. A private network instance does not support the following configuration items, and therefore they are not displayed by default: EIP, IP version, ISP, instance specification, network billing mode, and bandwidth cap. The supported network types vary by billing mode: In pay-as-you-go billing mode, both the public and private network types are supported.
EIP	If EIP is not selected, Tencent Cloud will assign you a public network CLB instance whose public IP address cannot be changed. If EIP is selected, Tencent Cloud will assign you an EIP and a private network CLB instance, which has the similar features of public network CLB. (Only pay-as-you-go public network CLB instances allow you to select an EIP.)
IP version	Supports the following CLB IP versions: IPv4, IPv6, and IPv6 NAT64. Only pay-as-you-go instances support the IPv6 version. For more information about other restrictions, see IP Versions. IPv6 CLB is currently in beta. To try it out, submit a ticket.
Network	CLB supports classic network and VPC. The classic network is a public network resource pool for all Tencent Cloud users. The private IPs of all CVMs are assigned by Tencent Cloud. You cannot customize IP ranges or IP addresses. A VPC is a logically isolated network space in Tencent Cloud. In a VPC, you can customize IP ranges, IP addresses, and routing policies. A VPC is more suitable for use cases requiring custom configurations. Besides, the overall classic network products were officially discontinued on December 31, 2022. For details, see Ending Support for Classic Network. We recommend you choose a VPC.
ISP	Supports the following ISP types: BGP (multi-line), China Mobile, China Telecom, and China Unicom. In pay-as-you-go billing mode, all of the above four options are supported. Currently, the static single-line IP is supported only in Guangzhou, Shanghai, Nanjing, Jinan, Hangzhou, Fuzhou, Beijing, Shijiazhuang, Wuhan, Changsha, Chengdu, and Chongqing. For the support information in other regions, see the console. If you want to try it out, contact the sales rep for application. Once your application is approved, you can select an ISP (China Mobile, China Unicom, or China Telecom) on the purchase page.
Primary/Secondary availability zone	The primary availability zone (AZ) is an AZ that currently sustains the traffic. The secondary AZ does not sustain traffic by default and will be used only when the primary AZ is unavailable.
Instance specification	Supports shared and LCU-supported instances. Shared instances guarantee performance according to their specifications. A single instance can sustain up to 50,000 concurrent connections, 5,000 new connections per second, and 5,000 queries per second. An LCU-supported instances provide guaranteed performance according to specifications. A single instance can sustain up to ten million concurrent connections, 1 million new connections per second, and 300,000 queries per second.
Network billing mode	Supports the following network billing modes: bill-by-traffic and bandwidth package.
Bandwidth cap	The public network bandwidth cap of a shared CLB is 2 Gbps. For the private network bandwidth cap, it's suggested to set a value within 5 Gbps. The bandwidth cap of an LCU-supported CLB instance depends on the selected specification. For details, see Instance Specifications Comparison.
Project	Select a project.
Tag	Select a tag key and value. You can also create a tag as instructed in Creating Tags and Binding Resources.
Instance name	The name can contain up to 60 characters, including letters, numbers, hyphens, underscores, and dots. If it is not specified, a name will be automatically generated by default.