Cloud Load Balancer

A secure, stable, and elastically scalable traffic distribution service that improves system availability by eliminating single points of failures

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Overview

Cloud Load Balancer (CLB) is a secure and fast traffic distribution service. CLB can automatically distribute inbound traffic to multiple Cloud Virtual Machine (CVM) instances in the cloud to improve the system service capabilities and eliminate single points of failures. CLB supports hundreds of millions of connections and tens of millions of concurrent requests, handles high-traffic access, and meets various business needs.

Overview

CLB Documentation

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Benefits

High performance

A single CLB cluster (not 1 instance) supports up to 120 million concurrent connections and can handle up to 40 Gbit/s traffic bandwidth or process 6 million data packets per second. This enables you to easily sustain ecommerce websites, social networking platforms, and gaming businesses with over 10million daily page views. 

High availability

A CLB cluster consists of multiple physical servers and can offer availability of up to 99.95%. In the extreme case where only 1 CLB instance is available, CLB can still support over 30 million concurrent connections. The cluster system will promptly remove faulty instances and maintain the healthy ones to ensure that the real server continues to operate properly. 

Elastic scalability

The CLB cluster scales the service capabilities of the application system elastically according to the business load and automatically creates and releases CVM instances through the dynamic scaling group of Auto Scaling.These features, in conjunction with a dynamic monitoring system and a billing system that is accurate to the second, eliminate the need to manually intervene or estimate resource requirements, help reasonably allocate computing resources, and prevent resource waste. 

Security and stability

With the aid of Anti-DDoS service distributed system, CLB can defend against most network attacks (such as DDoS, CC, and web intrusion attacks) and cleanse malicious traffic within seconds to avoid blocking IP addresses and full occupying all bandwidth. CLB's built-in synproxy anti-attack mechanism prevents backend CVMs from being attacked and overloaded before Anti-DDoS service system takes effect, ensuring the data security and stability. 

Low costs

You do not need to invest in additional load balancing hardware or spend time on tedious OPS work. Up to 99% of hardware and labor costs can be saved. CLB is billed on a pay-as-you-go basis. You can create and terminate CLB instances at any time according to the business needs. 

Scenarios

Professional Scenario

Business Type

The business has obvious peaks and valleys. Business stability and low costs are desired.

Scenario Description

  • The business goes through significant peaks and valleys and requires flexible control of backend resources.
    The business is highly time-sensitive. For example, during ecommerce promotion campaigns, such as Black Friday, web page views may increase tenfold within a few hours, and a large number of backend CVMs need to be added when visitor quantity surges. When the traffic drops, the unnecessary CVMs need to be terminated. CLB can be used to distribute traffic to the business systems to help flexibly enhance the service capabilities of the application systems and elastically adjust the backend resources in real time.
  • The business has high peak traffic. A low-cost architecture is required.
    When a business has high peak traffic, using traditional hardware to build a cluster will be very costly and require tedious OPS work. CLB can work together with the Cloud Monitor to effectively deal with high peak traffic, reduce deployment costs, relieve you from hardware OPS duties, and allow you to focus on developing product features.

Separation Scenario

Business Type

  • The business has complex modules and requires separation of dynamic and static services.

Scenario Description

  • The business requires separation of dynamic and static services and flexible forwarding.
    When the number of requests is high, requests can be distributed in a targeted manner by differentiating static and dynamic requests to reduce the backend load pressure. The dynamic requests can be processed by separately deployed CLB instances and associated real server clusters, while the static content can be connected to CDN and optimized by COS to significantly improve the loading speed.

Hybrid Cloud Scenario

Business Type

  • The website or business requires data interconnection.

Scenario Description

  • The business requires content-based routing and forwarding for IP convergence.

A large website generally has hundreds of business modules. CLB can analyze HTTP headers by setting different forwarding rules or groups to separate the business modules and achieve content-based routing and forwarding. In addition, custom forwarding paths can be used instead of second-level domain names to reduce the number of DNS polls, converge IP addresses, and improve the service accessing speed.

  • The Direct Connect - hybrid cloud solution achieves stable data transfer and flexible migration.

With the hybrid cloud solution, the core internal systems and data of the business can be stored in the user-built IDC, and the services can be deployed in the cloud to cope with surges in user traffic. Direct Connect ensures the stability and speed of in/off-cloud data transfer and guarantees data consistency. In addition, the business can be gradually migrated to the cloud through flexible weight configuration. An elastic, fast, reliable, and low-cost business deployment can be easily implemented in combination with data transfer through Direct Connect.