High Performance and Elasticity
Stable, Reliable, and Globally Available
Server Load Balancer (SLB) provides high-performance load balancing services. Classic Load Balancer (CLB) runs at Layer 4 and supports up to 100,000 QPS. The newly released Application Load Balancer (ALB) service is based on Alibaba Cloud Apsara Network 2.0 and supports up to 1,000,000 QPS.
The Server Load Balancer (SLB) instances feature high performance and support auto scaling. They can automatically adjust resources based on your business requirements to simplify O&M.
High Security and Reliability
Server Load Balancer (SLB) provides disaster recovery at four levels for high availability. CLB and ALB support built-in Anti-DDoS services to ensure business security. In addition, you can integrate ALB with WAF in the console to ensure security at the application layer.
Server Load Balancer (SLB) supports multiple protocols, such as TCP and UDP at the network layer, and HTTP, HTTPS, QUIC, and gRPC at the application layer. ALB provides multiple advanced routing features at Layer 7.
ALB and CLB support cloud-native networks. ALB is integrated with other cloud-native services, such as Container Service for Kubernetes (ACK), Serverless App Engine (SAE), and Kubernetes, and functions as a cloud-native gateway to distribute inbound network traffic.
|Type||Classic Load Balancer (CLB)||Application Load Balancer (ALB)|
Provides powerful processing capabilities for Layer 4 load balancing
Supports protocols such as TCP, UDP, HTTP, and HTTPS
Focuses on network delivery
Provides powerful processing capabilities at Layer 7 and multiple advanced routing features
Supports HTTP, HTTPS, and QUIC at Layer 7
Focuses on application delivery
Developed on top of a physical machine architecture
Supports up to 5,000,000 connections
Based on the NFV platform
A single ALB instance supports 1,000,000 QPS
|O&M||Provides multiple specifications that you can specify based on the traffic peaks in your business||Supports auto scaling to adjust processing capabilities based on inbound traffic|
|Cloud-Native Support||Supports cloud-native services||Serves as a cloud native gateway to distribute and mirror network traffic and supports canary release and blue-green deployment|
Distributes network traffic across backend servers at Layer 4 to ensure the high availability of websites and systems
Supports a large number of concurrent connections to backend servers
Provides intra-region and cross-region disaster recovery
Provides high-performance services and supports auto scaling at Layer 7
Maintains low network latency for audio and video applications that handle a large amount of network traffic
Supports canary release and blue-green deployment for cloud native applications
|Pricing||CLB Pricing Details >||ALB Pricing Details >|
|Getting started||Create a CLB||Create an ALB|
Supports multiple protocols to meet your business requirements in various scenarios.
Supports Layer 4 load balancing over TCP or UDP and Layer 7 loading balancing over HTTP or HTTPS
Supports QUIC at the application layer. QUIC is an advanced protocol that improves transmission on audio, video, and mobile applications. ALB also supports gRPC, which facilitates efficient communication among microservices through API operations.
Multi-Level Disaster Recovery
Provides disaster recovery at multiple levels to ensure high availability.
Monitors the condition of backend servers regularly. SLB does not distribute network traffic to unhealthy backend servers to ensure availability.
Supports multi-zone deployment in specific regions to provide zone-disaster recovery.
Cluster Deployment and Session Synchronization
Server Load Balancer (SLB) supports cluster deployment and session synchronization. You can perform hot upgrades and monitor the health and performance of machines in real-time.
Secure and Reliable
Provides built-in security capabilities (free of charge) to secure transmission and reduce costs.
Layer 4 Security
Server Load Balancer (SLB) is resilient against DDoS, SYN flood, UDP flood, ACK flood, ICMP flood, and DNS flood attacks at Layer 4.
Layer 7 Security
Provides security capabilities at Layer 4 and Layer 7. Layer 7 supports the configuration read-only mode. You can integrate Server Load Balancer (SLB) with WAF to secure your applications.
Provides certificate management for HTTPS requests to ensure the reliability and security of the transmission.
Supports multiple scheduling algorithms and forwarding methods to improve the application deployment flexibility.
Supports Weighted Round Robin (WRR) and Weighted Least Connection (WLC). You can specify scheduling algorithms to distribute network traffic based on your business requirements.
Domain Name and URL Forwarding
Distributes network traffic across backend servers based on domain names and URLs. This improves the application deployment flexibility.
Flexible Management and Billing
Allows you to specify the instance type and billing method based on your business requirements. Alibaba Cloud also provides multiple methods to manage your Server Load Balancer (SLB) service.
Supports the pay-as-you-go and subscription billing methods and the pay-by-data-transfer and pay-by-bandwidth metering methods.
You can create, configure, and manage Server Load Balancer (SLB) instances in the console by calling APIs in OpenAPI or using Alibaba Cloud SDKs.
Workloads on backend servers are heavy during peak hours in the audio, video, and game industries:
• A large amount of network traffic is forwarded between clients and backend servers in scenarios, such as short videos, long videos, livestreaming, online education, and online games.
• Large traffic fluctuations occur in audio and video scenarios. This affects the performance, elasticity, stability, and availability of systems.
Supports Cloud Network Management 2.0. A single SLB instance supports 1,000,000 QPS.
SLB automatically adjusts its processing capabilities based on the inbound traffic. You do not need to configure the service manually.
Supports QUIC to facilitate transmission for videos and reduce First Contentful Paint (FCP) time.
Alibaba Cloud CDN
A highly scalable and cost-effective service to accelerate content delivery.Learn More
Automatically protects your service from DDoS attacks.Learn More
ApsaraDB for Redis
A fully-managed cloud database service that supports Redis.Learn More
Frequent business adjustment occurs in scenarios, such as new retail, new finance, product releases, and large-scale promotions.
Services must be secure, reliable, elastic, and ready to use after they are activated.
You must provide flexible billing to reduce costs.
You do not need to purchase or deploy any hardware. The SLB service is ready to use after it is activated. You can specify billing methods based on your business requirements. This allows you to manage your business flexibly and efficiently.
SLB automatically adjusts its processing capabilities based on inbound traffic. You do not need to configure the service manually in large-scale promotion scenarios.
High Security and Reliability
Provides disaster recovery at four levels. SLB supports integration with Anti-DDoS and Cloud Firewall to secure your business.
Elastic Compute Service (ECS)
Provides elastic and secure servers to host your services on the cloud.Learn More
Web Application Firewall (WAF)
Defends websites from common attacks at the application layer to ensure security and availability.Learn More
Cloud Enterprise Network (CEN)
A global network that consists of interconnected hybrid clouds and distributed systems.Learn More
Enterprises from the Internet, finance, and enterprise sectors want to use advanced cloud-native technologies to deploy their new businesses on the cloud or adjust their current businesses.
You must use the cloud-native SLB service to use ACK, SAE, or Kubernetes.
Integrated with ACK, SAE, and Kubernetes. SLB functions as a cloud-native gateway on Alibaba Cloud to distribute inbound network traffic.
Fully Developed APIs
SLB supports gRPC and provides fully-developed APIs that you can call to manage the connections to a large number of microservices.
Container Service for Kubernetes (ACK)
Provides secure and highly-available container services and supports stable upgrades.Learn More
Elastic IP Address (EIP)
An independent public IP resource that allows flexible management.Learn More
Functions as an Internet gateway for a VPC.Learn More
Multinational enterprises want to distribute network traffic from different regions across applications and connect their data centers to Alibaba Cloud in a cost-effective way.
They want to build a hybrid cloud or a cross-region network that provides multi-level disaster recovery.
Support for All Regions
Supports intelligent DNS resolution. Client traffic is directed to the best available IP addresses to accelerate transmission and improve the user experience.
Multi-Level Disaster Recovery
SLB provides high availability across regions and zones.
Ease of Use
You can use SLB and CEN to build a global network that connects data centers in different regions to Alibaba Cloud in a fast and simplified way.
Global Accelerator (GA)
Provides network acceleration services for your Internet-facing application globally.Learn More
Cloud Enterprise Network (CEN)
Allows you to build a global network that consists of interconnected hybrid clouds and distributed systems with scalability and communication capabilities at the enterprise level.Learn More
Object Storage Service (OSS)
Provides encrypted and secure storage services on the cloud.Learn More
Customer Success Stories
Server Load Balancer (SLB) applies to multiple scenarios and ensures the high performance and high reliability of service delivery. You can use Server Load Balancer (SLB) in the Internet, gaming, education, finance, and enterprise sectors.
Course: Handle Large Traffic with Load Balancer
This course provides you basic information about the Server Load Balancer (SLB) service and the scenarios in which you can use the service. This course also provides you information about the features of SLB and how to use the service.View Details
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