Overview
Cloud Load Balancer (CLB) functions as a dependable and rapid traffic distribution solution, ensuring secure transmission. It efficiently allocates incoming traffic across multiple Cloud Virtual Machine (CVM) instances in the cloud, thereby enhancing service capacities methodically and eradicating potential single points of failure. With support for hundreds of millions of connections and tens of millions of concurrent requests, CLB facilitates seamless management of heavy traffic influxes, adeptly addressing demanding business requirements.
Benefits
High Performance
A singular CLB cluster, as opposed to a single instance, has the capacity to accommodate up to 120 million simultaneous connections and manage traffic bandwidth of up to 40 Gbps, processing approximately 6 million data packets per second. This capability facilitates the seamless operation of e-commerce platforms, social networking sites, and gaming enterprises experiencing daily page views exceeding 10 million.
High Availability
A single CLB cluster comprises four physical servers, providing a reliability level of up to 99.95%. Even in the unlikely scenario where only one CLB instance remains functional, it can still sustain more than 30 million simultaneous connections. The cluster infrastructure promptly eliminates defective instances and maintains operational integrity by retaining healthy instances for seamless backend server functionality.
Elastic Scalability
The CLB cluster dynamically adjusts the service capacities of the application system based on business demand, seamlessly provisioning and decommissioning CVM instances through the Auto Scaling dynamic scaling group. Paired with a dynamic monitoring system and precise billing structure that operates on a per-second basis, manual intervention or resource estimation becomes unnecessary, streamlining the allocation of computing resources for optimal efficiency.
Security and Stability
Utilizing the BGP Anti-DDoS system, CLB effectively safeguards against a multitude of network threats including DDoS, CC, and web intrusion attacks. It swiftly mitigates attack traffic, averting IP blockages and bandwidth saturation within seconds. CLB’s integrated synproxy anti-attack mechanism safeguards backend CVMs from potential overloads and attacks prior to the activation of the BGP system, thereby ensuring the integrity and stability of data transmission.
Low Costs
CLB removes the necessity of procuring extra load-balancing hardware and dedicating resources to labor-intensive operational tasks, resulting in potential savings of up to 99% on hardware and labor expenses. Billing for CLB operates on a pay-as-you-go model, ensuring charges are solely based on actual usage. CLB instances can be initiated or terminated as per business requirements, providing flexibility aligned with organizational needs.
Features
Request Redirection
The application-oriented CLB layer-7 protocol facilitates personalized redirection (rewrite) capabilities, such as enforced HTTPS. In this scenario, when a web service is accessed via an HTTP request from a PC or mobile browser, the CLB proxy intervenes to ensure that the browser receives an HTTPS response, thereby compelling the browser to access the webpage securely via HTTPS.
Multiple Scheduling Algorithms
CLB offers three scheduling algorithms (weighted round robin, IP hash, and weighted least connections) and allows users to adjust the weights of backend CVMs to achieve balanced traffic distribution and enhance CLB efficiency. Furthermore, CLB supports the least connections scheduling algorithm in layer-7 HTTP protocol, ensuring optimal backend load management.
Session Persistence
For users employing layer-4 functionality, CLB offers a straightforward session persistence feature, also known as source address-based or IP-based session persistence. During load balancing operations, CLB utilizes the source address of the access request to determine the relevant session and directs all subsequent requests from the same IP address (or IP address range) to the same CVM.
Weight Configuration
The weight configuration functionality enhances the processing efficiency of backend CVMs by expediting request handling. Backend CVMs can have their weight adjusted within an integer range of 1 to 100, with a default setting of 10. CLB allocates traffic to various backend CVMs according to these designated weights, or by utilizing hash and polling outcomes from accessing source IP addresses. Elevated weights may be assigned to CVMs boasting superior specifications, such as enhanced CPU and memory capabilities.
Content-based Routing
The CLB layer-7 protocol, tailored to applications, offers content-based routing capabilities, facilitating the inclusion of user-defined domain names/URLs and personalized forwarding rules and groups. It empowers the allocation of requests to backend CVMs based on various forwarding criteria. CLB enables the segmentation of target groups for business distinction, thereby significantly enhancing service efficacy.
Cross-AZ Disaster Recovery
CLB is strategically positioned across multiple availability zones within a given region. For instance, two robust primary/secondary clusters can be deployed in Guangzhou Zone 2 and Guangzhou Zone 3 respectively. In the event of service unavailability in Guangzhou Zone 2, traffic seamlessly transitions to Guangzhou Zone 3, effectively addressing data center-level faults with ease.
Multi-protocol Forwarding
The CLB facilitates requests from both layer-4 protocols, such as TCP and UDP, and layer-7 protocols, like HTTP and HTTPS. Its centralized certificate management system is designed to bolster the HTTPS protocol, thereby enhancing data transfer speeds, security, and reliability.
Health Checks
Users have the option to adjust the frequency at which CLB conducts checks to verify the operational status of backend CVMs. Upon detecting an exception in a CVM, CLB will cease traffic distribution to that instance and prioritize healthy counterparts, thus safeguarding uninterrupted business operations.
Scenarios
Professional
Separation
Hybrid Cloud
Business Type:
- The enterprise experiences pronounced fluctuations in activity and seeks stability and cost-effectiveness.
Scenario Description:
- The enterprise undergoes significant fluctuations in activity and necessitates flexible management of backend resources. It faces stringent time constraints, particularly during e-commerce promotional events where web traffic can surge by over tenfold within a few hours, requiring rapid scaling of backend CVMs. CLB serves to distribute traffic among business systems, enhancing application service capabilities and enabling real-time adjustments to backend resources as traffic fluctuates.
- The enterprise contends with high peak traffic and aims to establish a cost-efficient architecture. Traditional hardware-based clustering solutions entail substantial expenses and operational complexities. By leveraging CLB in conjunction with Cloud Monitor, the enterprise can effectively manage peak traffic while minimizing deployment costs and alleviating the burden of hardware operations, thereby allowing focus on product feature development.
Business Type:
- The enterprise operates intricate modules necessitating the segregation of dynamic and static services.
Scenario Description:
- The enterprise mandates the segregation of dynamic and static services and adaptable routing. During peak request periods, targeted distribution of website requests can be achieved by distinguishing between static and dynamic requests, thereby alleviating backend load pressure. Dynamic requests are handled by independently deployed CLB and their associated backend CVM clusters, while static content is routed through CDN for optimization by COS, resulting in substantial improvements in loading speed.
Business Type:
- The website or enterprise necessitates data connectivity.
Scenario Description:
- The enterprise requires content-based routing and forwarding for IP convergence. Typically, a large-scale website comprises numerous business modules. CLB offers the capability to analyze HTTP headers, enabling the establishment of distinct forwarding rules or groups to segregate these modules and achieve content-based routing and forwarding. Moreover, custom forwarding paths can be employed in lieu of second-level domain names to minimize DNS queries, consolidate IPs, and enhance service access speed.
- The Direct Connect-hybrid cloud solution facilitates stable data transmission and flexible migration. Through a hybrid cloud solution, the core internal systems and data of the enterprise can be housed in the user-built IDC, while services can be deployed in the cloud to accommodate fluctuations in user traffic. Direct Connect ensures the stability and swiftness of data transfer between on-premises and cloud environments to ensure data consistency. Furthermore, leveraging flexible weight configuration, the enterprise can gradually transition to the cloud, seamlessly integrating with Direct Connect’s data transfer capabilities to achieve an elastic, fast, dependable, and cost-effective business deployment.
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