Server Load Balancer:Release notes

Feature

Type

Description

Reference

Disable Application Load Balancer (ALB) cross-zone load balancing

New feature

If you disable cross-zone load balancing for the server group associated with your ALB instance, your ALB instance distributes requests only to backend services deployed in a single zone of a region. By disabling cross-zone load balancing, the network latency caused by cross-zone data transfer can be eliminated. This improves the request access speed for your business.

• Create and manage server groups

• Disable cross-zone load balancing to reduce access latency

Create ALB multi-cluster gateways in Distributed Cloud Container Platform for Kubernetes (ACK One)

New feature

In ACK One, you can create an ALB multi-cluster gateway and associate multiple clusters with it to build a zone disaster recovery or hybrid disaster recovery system for your application in hybrid cloud and multi-cluster scenarios, facilitating efficient traffic management and governance.

• Overview of ALB multi-cluster gateways

• Use ALB multi-cluster gateways to implement zone-disaster recovery in ACK One

• Use ALB multi-cluster gateways to implement hybrid disaster recovery in ACK One

Automatic workload migration from an NGINX Ingress to an ALB Ingress

New feature

During workload migration from an NGINX Ingress to an ALB Ingress, the migration tools provided by ACK automatically convert the NGINX Ingress configurations to ALB Ingress configurations. This saves you from manual conversion of configurations and improves the migration speed as well as security.

Migrate workloads from a self-managed NGINX Ingress to an ALB Ingress

ALB and Network Load Balancer (NLB) domain name upgrade

Update

Alibaba Cloud has upgraded the domain names for ALB and NLB instances. For ALB and NLB instances created at or after 00:00:00 on November 15, 2024 (UTC+8), you must use the new domain names. Default domain names provided by Alibaba Cloud DNS can no longer be used to access ALB and NLB instances.

ALB and NLB domain name upgrade

Feature

Type

Description

Reference

Dual-stack Application Load Balancer (ALB) instances available in more regions

Update

Dual-stack ALB instances are available in UK (London), US (Silicon Valley), and Japan (Tokyo).

Regions in which dual-stack ALB instances are available

Network Load Balancer (NLB) subscription resource plans

New feature

NLB supports subscription resource plans. After an NLB resource plan takes effect, it automatically offsets the Load Balancer Capacity Unit (LCU) fees and instance fees of NLB. NLB resource plans are more cost-effective than the pay-as-you-go billing method. You can specify the time when you want your resource plans to take effect. NLB resource plans are suitable for enterprises on a fixed budget.

• NLB billing overview

• Introduction to NLB resource plans

• Purchase an NLB resource plan

• Configure low capacity alerts

Gateway Load Balancer (GWLB) public preview

New feature

GWLB is in public preview. GWLB is a load balancer that functions at the network layer, listening for IP packets across all ports and distributing them to network virtual appliances in the backend server group. You can use GWLB free of charge during the public preview.

• What is GWLB?

• Use a GWLB instance to create a security check system for IPv4 traffic

Feature

Type

Description

References

NLB UDP health checks

New feature

NLB can perform UDP health checks on ports and custom UDP health checks.

• UDP health checks on ports: NLB sends an ICMP request packet and a UDP probe packet to a backend server. If the backend server returns an ICMP response packet and does not return the Port XX Unreachable message before the response timeout period ends, the backend server passes the health check. Otherwise, it fails the health check.

• Custom UDP health checks: NLB sends a UDP probe packet that contains specified characters to a backend server. If NLB receives the specified message before the response timeout period ends, the backend server passes the health check. Otherwise, it fails the health check.

• Create and manage a server group

• NLB health check overview

• Troubleshooting methods for NLB health check issues

Dual-stack NLB instances available in more regions

Update

Dual-stack NLB instances are available in UK (London).

NLB instances

Quick enablement of Web Application Firewall (WAF) protection for ALB instances

Update

With just one click, you can enable or disable WAF protection for your ALB instance based on your business needs. After enablement, your instance is upgraded to a WAF-enabled edition. Before making a payment, you can view the detailed billing information.

Activate and manage WAF-enabled ALB instances

ALB available in more zones

Update

ALB is available in Beijing Zone L.

Regions and zones in which ALB is available

Feature

Type

Description

References

EIP retained when Internet-facing Classic Load Balancer (CLB) is released

New feature

Elastic IP addresses (EIPs) can be retained when you release Internet-facing CLB instances. The retained EIPs can be associated with instances in other regions. For example, you can associate the EIPs with ALB instances or other CLB instances. This way, the public IP address of your instance can remain unchanged when you migrate your instance.

Create and manage CLB instances

Optimized Throttle Traffic action for ALB listener forwarding rules

Update

The Throttle Traffic action of ALB listener forwarding rules can be used together with the Forward To and Return Fixed Responses actions.

Manage forwarding rules for a listener

Feature

Type

Description

References

User guide for migrating Layer 4 listeners from CLB to NLB

New feature

Compared with CLB, NLB supports ultra-high load balancing performance on Layer 4. NLB can process a large number of concurrent connections and supports SSL offloading for TCP traffic and connection throttling. If your business continues to grow and has higher requirements for features, performance, stability, and elasticity, you can migrate Layer 4 listeners from your CLB instance to an NLB instance, which supports more concurrent connections.

Best practices for migrating CLB Layer 4 listeners to NLB

Feature

Type

Description

References

ALB integration with Global Accelerator (GA)

New feature

ALB is integrated with GA. If your application deployed on ALB requires higher Internet quality, you can use GA to accelerate access to the application and improve user experience. After GA is enabled, requests are forwarded to Alibaba Cloud through the nearest access points and accelerated by Alibaba Cloud.

Integrate ALB with GA to enable application acceleration

ALB security groups

New feature

ALB instances can be added to basic security groups and advanced security groups. Security groups support stateful packet inspection (SPI) and packet filtering. You can add ALB instances to a security group to improve the security of the ALB instances.

• Add an ALB instance to a security group

• Add an ALB instance to a security group and configure access control based on listeners and ports

• Add an ALB instance to a security group and configure a whitelist and a blacklist

Feature

Type

Description

References

ALB instance creation and management in the Container Service for Kubernetes (ACK) console by using ALB Ingresses

New feature

ALB instances can be created and used when you create clusters or install the ALB Ingress controller in the ACK console, without using the YAML file to create resources.

• ALB Ingress overview

• Create ALB Ingress

Custom forwarding rules created by ALB Ingresses in the ACK console

New feature

Custom forwarding rules can be flexibly created for ALB instances in the ACK console.

• ALB Ingress user guide

• Create custom forwarding rules for ALB Ingresses

Feature

Type

Description

References

Listening on multiple port ranges by NLB

Update

Listening on multiple port ranges is supported by NLB. If your service requires request distribution to multiple port ranges, you can enable listening on multiple port ranges for your NLB instance. This feature allows you to distribute requests to different port ranges without using more NLB instances. You can simplify O&M and save costs.

• Add a TCP listener

• Add a UDP listener

• Add a listener that uses SSL over TCP

Slow starts for ALB

New feature

The slow start mode is supported by ALB. After you enable the slow start mode, ALB gradually increases the number of requests forwarded to scaled out backend servers to prevent traffic spikes in scenarios such as resource preparation, caching, and prefetching.

• Create and manage a server group

• Use slow starts to implement graceful deployment of services

Connection draining for ALB

New feature

Connection draining is supported by ALB. To prevent unexpected disconnections caused by backend server removal or unhealthy backend servers, you can enable connection draining to allow connections to remain open until the connection draining timeout period end. Connection draining ensure smooth undeployment of services.

• Create and manage a server group

• Use connection draining to implement graceful undeployment of services

Feature

Type

Description

References

Managed Service for OpenTelemetry for ALB

New feature

ALB is integrated with Managed Service for OpenTelemetry, which can map and analyze traces for ALB, including request sources, nodes, and response time. Managed Service for OpenTelemetry helps you quickly identify and manage service errors.

• Manage Managed Service for OpenTelemetry

• Enable Managed Service for OpenTelemetry for ALB

Fine-grained monitoring for NLB

New feature

NLB is integrated with Simple Log Service, which supports fine-grained monitoring. You can query the monitoring metrics of Layer 4 listeners to check the monitoring data of an NLB instance, including the amount of network traffic within seconds, number of new connections, and maximum number of connections. This helps you identify errors based on more detailed monitoring data.

Configure fine-grained monitoring for NLB

Feature

Type

Description

References

NLB available in more regions

Update

NLB is available in the South Korea (Seoul) and Malaysia (Kuala Lumpur) regions.

Regions and zones in which NLB is available

Feature

Type

Description

References

NLB available in more regions

Update

NLB is available in the following regions: China (Guangzhou), Japan (Tokyo), US (Virginia), and US (Silicon Valley).

Regions and zones in which NLB is available

Advanced security groups for NLB

Update

NLB instances can be added to advanced security groups. Advanced security groups support more private IP addresses. NLB instances can be added to advanced security groups, which support a larger number of private IP addresses.

• Add an NLB instance to a security group

• Configure security groups for NLB instances

• Use security groups as blacklists or whitelists

Managed Service for Prometheus for ALB

New feature

ALB is interfaced with Managed Service for Prometheus. You can view the monitoring data of ALB by using the metrics, dashboards, and alerts provided by Managed Service for Prometheus.

Integrate ALB with Managed Service for Prometheus

Feature

Type

Description

References

Operation logs for NLB

New feature

NLB is integrated with ActionTrail. You can query events generated within the last 90 days or 90 days ago in multiple regions in the NLB console.

View NLB operation logs

Fine-grained monitoring for ALB

Update

Metrics are collected every second and are recorded in the access logs of ALB. You can query the metrics to identify exceptions that are related to network jitters.

View access logs

Advanced features of ALB Ingresses

Update

• Custom forwarding rules are supported by ALB Ingresses.

• ALB Ingresses can be used to associate pods in Container Service for Kubernetes (ACK) clusters and Elastic Compute Service (ECS) instances outside ACK clusters with ALB instances. You can use a combination of ALB, transit routers, and Cloud Enterprise Network (CEN) instances to associate on-premises servers or servers in another region with an ALB instance.

• Advanced features

• Create custom forwarding rules for ALB Ingresses

• Use ALB Ingresses to configure hybrid backend server groups, associate ECS instances with an ALB instance deployed in a different region, and associate on-premises servers with an ALB instance

Feature

Type

Description

References

Elastic IP addresses (EIPs) protected by Anti-DDoS Pro/Premium for NLB

New feature

EIPs that are protected by Anti-DDoS Pro/Premium can be associated with NLB instances. The NLB instances can use the EIPs to access the Internet in a secure manner. You can associate an EIP protected by Anti-DDoS Pro/Premium with an NLB instance when you create an NLB instance or when you change the network type of an NLB instance.

EIPs protected by Anti-DDoS Pro/Premium can mitigate DDoS attacks at the Tbit/s level, and are ideal for scenarios that require high security and low latency.

• Enable an NLB instance to use an EIP protected by Anti-DDoS Pro/Premium to access the Internet

• Change the network type of an NLB instance

Instance diagnostics for ALB

New feature

ALB is interfaced with Network Intelligence Service (NIS) and provides the instance diagnostics feature. The instance diagnostics feature can diagnose the configurations and running status of instances, generate diagnostic reports, and provide suggestions on how to fix anomalies.

ALB instance diagnostics

Feature

Type

Description

References

User guide for migration of Layer 7 listeners from CLB to ALB

New feature

Compared with CLB, ALB provides better load balancing capabilities at Layer 7 and provides more advanced routing features. A user guide is provided to help you migrate services from a Layer 7 listener of CLB to ALB. This way, ALB provides services at Layer 7 instead of CLB.

Manual migration of Layer 7 listeners from CLB to ALB

EIPs protected by Anti-DDoS Pro/Premium for ALB

New feature

EIPs that are protected by Anti-DDoS Pro/Premium can be associated with ALB instances. The ALB instances can use the EIPs to access the Internet in a secure manner. You can associate an EIP protected by Anti-DDoS Pro/Premium with an ALB instance when you create an ALB instance or change the network type of an ALB instance.

EIPs protected by Anti-DDoS Pro/Premium can mitigate DDoS attacks at the Tbit/s level, and are ideal for scenarios that require high security and low latency.

• Associate an EIP protected by Anti-DDoS Pro/Premium with an ALB instance

• Change the network type of an ALB instance

• What types of EIPs can be associated with ALB instances?

Service integration with ALB by using ALB Ingresses

Update

• Horizontal Pod Autoscaler (HPA) can be integrated with ALB by configuring an ALB Ingress. This enables auto scaling based on QPS.

• ACK clusters and ACK Serverless clusters that have Knative installed can be accessed by using an ALB Ingress.

• ALB can be used in self-managed Kubernetes clusters by configuring ALB Ingresses.

• Integration with other services

• Use ALB Ingresses to enable automatic application scaling based on QPS

• Use ALB Ingresses in self-managed Kubernetes clusters

Quota Center for NLB

New feature

NLB is integrated with Quota Center. You can apply for and view the general quotas of NLB in the Quota Center console.

• NLB quotas

• Manage NLB quotas

Feature

Type

Description

References

Troubleshooting

New feature

The troubleshooting feature is provided to help you troubleshoot instance status issues, access issues, and health check exceptions. This feature helps you monitor the status of SLB instances and identify and resolve issues in a timely manner.

Troubleshooting

Feature

Type

Description

References

Security groups for NLB

New feature

NLB instances can be added to security groups. An NLB instance can be added to a security group to allow or deny access from the NLB instance to the Internet or private networks.

• Add an NLB instance to a security group

• Configure security groups for NLB instances

• Use security groups as blacklists or whitelists

Mutual authentication for TCP/SSL listeners of NLB

Update

Mutual authentication is supported by TCP/SSL listeners of NLB

• Add a TCPSSL listener

• Use NLB to enable SSL offloading over TCP (mutual authentication)

Quota Center for ALB

New feature

ALB is integrated with Quota Center. You can apply for and view general quotas and privileges of ALB in the Quota Center console.

• ALB quotas

• Manage ALB quotas

Feature

Type

Description

References

NLB available for commercial use

New feature

The public preview and time-limited free trial of NLB have ended. NLB is available for commercial use.

[November 8, 2022] Announcement on the commercialization of NLB

Multi-port listening for NLB

Update

Multi-port listening is supported by NLB. After you enable this feature, NLB can listen on all the ports in a specified port range.

• Add a TCP listener

• Add a UDP listener

• Add a TCPSSL listener

Terraform for NLB

Update

Terraform can be used to create and manage NLB instances.

Deploy and manage NLB instances

Anycast EIPs for NLB

New feature

Anycast EIPs can be associated with NLB instances to enable the NLB instances to provide services over the Internet. To associate an Anycast EIP with an NLB instance, you can change the network type of the NLB instance.

• Change the network type of an NLB instance

• Associate Anycast EIPs with an NLB instance to enable access through the nearest access point

Source code of ALB Ingresses available on GitHub

Update

ALB Ingresses are compatible with NGINX Ingresses, and provide improved traffic routing capabilities based on ALB. ALB Ingresses support complex routing, automatic certificate discovery, and the HTTP, HTTPS, and QUIC protocols. In scenarios where you deploy cloud-native applications in self-managed Kubernetes clusters, ALB Ingresses meet the requirements for ultra-high elasticity and balancing of heavy traffic loads at Layer 7.

• Use ALB Ingresses in self-managed Kubernetes clusters

• Deploy the controller from source code

Feature

Type

Description

References

Anycast EIPs for ALB

New feature

Anycast EIPs can be associated with ALB instances to enable the ALB instances to provide services over the Internet. To associate an Anycast EIP with an ALB instance, you can change the network type of the ALB instance.

• Associate Anycast EIPs with an ALB instance to enable access through the nearest access point

• Change the network type of an ALB instance

Region list of WAF-enabled ALB instances

Update

A description of and region information about WAF-enabled ALB instances are provided. A user guide is provided to help you create and manage WAF-enabled ALB instances.

Activate and manage WAF-enabled ALB instances

Traffic mirroring to ALB server groups of the IP type

Update

A forwarding rule can be added to a listener of ALB to mirror traffic to a server group of the IP type.

Create a forwarding rule

Proxy protocol for NLB client IP address retrieval

New feature

The Proxy protocol is supported by NLB to pass client IP addresses to backend servers.

Obtain client IP addresses

On-premises servers as NLB backend servers

New feature

Backend servers can be specified by IP address for a server group of NLB. You can use NLB and CEN transit routers to enable NLB to forward requests to servers in a data center.

Add on-premises servers to an NLB instance within the same region

Feature

Type

Description

References

IPv6 for ALB

New feature

IPv6 is supported by ALB. You can purchase a dual-stack ALB instance and configure server groups and listeners to forward traffic from IPv6 clients to IPv4 and IPv6 backend services.

• ALB instances

• Use an ALB instance to serve IPv6 services

• Create an ALB instance

• Create and manage a server group

Feature

Type

Description

References

Advanced features of ALB Ingresses

Update

Cross-origin resource sharing (CORS), persistent TCP connections, and QPS throttling are supported by ALB Ingresses.

Advanced features

Feature

Type

Description

References

NLB public preview

New feature

NLB is in public preview. NLB instances are next-generation Layer 4 load balancers developed by Alibaba Cloud for the Internet of Everything (IoE). You can use NLB free of charge during the public preview

• What is NLB?

• Use an NLB instance to serve IPv4 services

ALB consistent hashing based on URLs

Update

Consistent hashing based on URLs is supported by ALB. Requests destined for the same URL are forwarded to the same backend server.

Create and manage a server group

CORS for ALB forwarding rules

Update

CORS is supported by forwarding rules of ALB. If the response is returned from a URL different from the URL requested by the client, CORS is triggered. The URL includes a protocol, a domain name, and a port.

Manage forwarding rules for a listener

Regular expressions as conditions of domain name-based and URL-based forwarding rules of ALB

New feature

Domain name-based and URL-based forwarding rules are supported by ALB listeners. You can specify a regular expression as the condition of a domain name-based forwarding rule or a URL-based forwarding rule for rewrites or redirects.

Create a domain name-based or URL-based forwarding rule

Feature

Type

Description

References

Google Remote Procedure Call (gRPC) for ALB

New feature

The gRPC protocol can be used by ALB to provide load balancing services. If gRPC is used, only frontend data transmission is encrypted and backend data is transmitted in plaintext. After you create a gRPC server group for an ALB instance, associate the server group with an HTTPS listener, and enable HTTP/2 and health checks, the ALB instance can forward gRPC requests to the gRPC server group.

• Create and manage a server group

• Health checks

• Enable load balancing for gRPC services

WAF-enabled ALB instances

Update

WAF-enabled ALB instances are available. As an upgrade from standard ALB instances, WAF-enabled ALB instances are integrated with WAF 3.0 to protect your web applications. Network traffic is filtered by WAF before it is routed to ALB listeners.

• Create an ALB instance

• Modify the configurations of ALB instances

WAF for ALB Ingresses

New feature

WAF is an all-in-one service that protects your websites and applications. You can use WAF to prevent data breaches, HTTP flood attacks, webshells, and web page tampering. WAF also provides virtual patches. After you enable WAF for an ALB Ingress, network traffic is filtered by WAF before it is routed to ALB listeners.

None.

Feature

Type

Description

References

Functions of Function Compute as backend servers of ALB

New feature

Functions of Function Compute can be specified as backend servers of ALB. ALB can be configured to forward requests from ALB to Function Compute.

Specify a function from Function Compute as a backend server of ALB

Feature

Type

Description

References

gRPC protocol for ALB Ingresses

New feature

The gRPC protocol is supported by ALB Ingresses. To use gRPC, add the annotation alb.ingress.kubernetes.io/backend-protocol: "grpc".

Advanced ALB Ingress configurations

ALB Ingress deployment based on ASK Knative

New feature

Knative is an open source and serverless application framework. Knative can help you deploy serverless workloads to Kubernetes and manage the workloads. ALB is a load balancing service intended for applications that use the HTTP, HTTPS, or Quick UDP Internet Connection (QUIC) protocol. ALB is highly scalable and can distribute large amounts of network traffic at Layer 7. ASK allows you to deploy ALB Ingresses based on Knative.

Use ALB Ingresses

Feature

Type

Description

References

ECS instances in different regions as ALB backend servers

New feature

Backend servers can be added to the server groups of ALB by IP address. Requests received by ALB can be routed to servers in other regions by using CEN transit routers.

Specify an ECS instance in a VPC as a backend server of ALB in a different region

On-premises servers as ALB backend servers

New feature

Backend servers can be added to the server groups of ALB by IP address. Requests received by ALB can be routed to on-premises servers by using CEN transit routers and other services.

Add on-premises servers to an ALB instance within the same region

Feature

Description

References

ALB Ingress creation in the ACK console

ALB Ingresses can be created in the ACK console. You can create Ingress rules for ALB Ingresses and customize Ingress configurations. ALB Ingresses use ALB instances to balance traffic loads at Layer 7.

Create ALB Ingress

A higher level of service uptime guaranteed by ALB instances that support multi-zone deployment

The service uptime guaranteed by ALB instances that support multi-zone deployment is increased from 99.95% to 99.995%.

SLB Service Level Agreement

Feature

Description

References

ALB Ingresses

ALB Ingresses are compatible with NGINX Ingresses, and provide improved traffic routing capabilities based on ALB instances. ALB Ingresses support complex routing, automatic certificate discovery, and the HTTP, HTTPS, and QUIC protocols. In scenarios where you deploy cloud-native applications in ACK or ASK clusters, ALB Ingresses meet the requirements for ultra-high elasticity and balancing of heavy traffic loads at Layer 7.

ALB Ingress overview

Feature

Description

References

ALB subscription resource plans

Subscription resource plans are provided by ALB. After an ALB resource plan takes effect, it automatically offsets the LCU fees and instance fees for ALB. Compared with the pay-as-you-go billing method, ALB resource plans are more cost-effective. You can specify the time when you want a resource plan to take effect as needed. ALB resource plans are suitable for enterprises on a fixed budget.

• ALB resource plans

• Purchase an ALB resource plan

Feature

Description

References

Internet Shared Bandwidth for ALB

An existing EIP and an Internet Shared Bandwidth instance can be associated with an ALB instance when you create the ALB instance. After the ALB instance is associated with an Internet Shared Bandwidth instance, the ALB instance shares the bandwidth of the Internet Shared Bandwidth instance with other ALB instances. This reduces bandwidth costs.

Use an ALB instance to serve IPv4 services

Feature

Description

References

Proxy protocol for CLB client IP address retrieval

Proxy Protocol can be used by Layer 4 listeners of CLB to pass client IP addresses to backend servers. After Proxy Protocol is enabled, CLB adds a TCP header to the request without modifying the existing headers. The TCP header carries information such as the source IP address, destination IP address, source port, and destination port.

Enable Layer 4 listeners to retrieve client IP addresses

Feature

Description

References

Mutual authentication for ALB

Mutual authentication is supported by HTTPS listeners of ALB.

• Add an HTTPS listener

• Manage certificates

• Configure mutual authentication for an HTTPS listener

Outbound forwarding rules for ALB

Inbound and outbound forwarding rules are supported by ALB.

Manage forwarding rules for a listener

Feature

Description

References

Optimized monitoring for CLB

The monitoring feature of CLB is optimized. By default, the health check data of forwarding rules is no longer displayed.

Configure alert rules

Feature

Description

References

ALB public preview

A free trial for ALB, a load balancing service intended for Layer 7, is available.

What is ALB?

Feature

Supported listener

References

Health checks

TCP

UDP

HTTP

HTTPS

Execute a health check script

Overview page in SLB console

TCP

UDP

HTTP

HTTPS

-

Feature

Supported listener

References

UDP and TCP listeners that belong to the same SLB instance and listen on the same port available in more regions

TCP

UDP

• Add a TCP listener

• Add a UDP listener

Secondary IP addresses of ENIs for ECS instances

UDP

TCP

HTTP

HTTPS

Add backend servers by specifying ENIs

Feature

Supported listener

References

Port listening by both a UDP and a TCP listener within the same SLB instance

UDP

TCP

• Add a TCP listener

• Add a UDP listener

Elliptic curve keys

HTTPS

Certificate requirements

TLS 1.3

HTTPS

TLS security policies

GET method for health checks of Layer 7 listeners

HTTPS

HTTP

• Add an HTTP listener

• Add an HTTPS listener

Feature

Supported listener

References

Query of available resources in zones by API calls

HTTPS

HTTP

UDP

TCP

DescribeAvailableResource

IPv6

HTTPS

HTTP

UDP

TCP

IPv6 CLB instances

Feature

Supported listener

References

Idle instance management

HTTPS

HTTP

UDP

TCP

Manage idle CLB instances

Feature

Supported listener

References

HTTP-to-HTTPS redirection

HTTP

Redirect HTTP requests to HTTPS

Feature

Supported listener

References

ENIs of ECS instances as backend servers

HTTPS

HTTP

UDP

TCP

Add backend servers by specifying ENIs

Feature

Supported listener

References

Certificates provided by Certificate Management Service

HTTPS

HTTP

UDP

TCP

RAM policy overview

IPv6

HTTPS

HTTP

UDP

TCP

IPv6 CLB instances

Advanced features, including custom scheduling algorithms, session persistence, and health checks, for forwarding rules

HTTP

HTTPS

Forward requests based on domain names or URLs

Feature

Supported listener

References

Batch modifications of ports and weights for multiple backend servers

HTTPS

HTTP

UDP

TCP

• Add an ECS instance to the default server group

• Create and manage a vServer group

Feature

Supported listener

References

Query of resource quotas by API calls

HTTPS

HTTP

UDP

TCP

-

Console upgrades on Alibaba Cloud China site

HTTPS

HTTP

UDP

TCP

Create and manage CLB instances

Consistent hashing algorithms, QUIC protocol, and UDP session persistence for Layer 4 listeners

UDP

TCP

• Add a TCP listener

• Add a UDP listener

Feature

Supported listener

References

Custom TLS versions

HTTPS

• TLS security policies

• Add an HTTPS listener

IPv6

HTTPS

HTTP

UDP

TCP

IPv6 CLB instances

Feature

Supported listener

References

HTTP/2

HTTPS

Add an HTTPS listener

Server Name Indication (SNI) that allows multiple certificates to be associated with SLB

HTTPS

Configure a CLB instance to serve multiple domain names over HTTPS

Blacklists and whitelists

HTTPS

HTTP

UDP

TCP

• Access control overview

• Enable access control.

Access logs

HTTP

HTTPS

Configure a CLB access log

ENIs of ECS instances as backend servers (by calling OpenAPI Explorer)

HTTPS

HTTP

UDP

TCP

AddBackendServers

Feature

Supported listener

References

Custom timeout periods for Layer 7 listeners

HTTP

HTTPS

• Add an HTTP listener

• Add an HTTPS listener

Feature

Supported listener

References

WebSocket and WebSocket Secure

HTTP

HTTPS

Use WebSocket to enable real-time messaging

HTTP/2

HTTPS

Add an HTTP listener

Feature

Supported listener

References

Alibaba Cloud Security thresholds of SLB instances

HTTPS

HTTP

UDP

TCP

Anti-DDoS Origin Basic

High-performance CLB instances

HTTPS

HTTP

UDP

TCP

FAQ about high-performance CLB instances

Feature

Supported listener

References

Layer 7 monitoring metrics such as QPS

HTTP

HTTPS

View monitoring information about CLB

Custom timeout periods for Layer 4 listeners

TCP

Add a TCP listener

Bandwidth sharing between listeners of an SLB instance

HTTPS

HTTP

UDP

TCP

• Add a TCP listener

• Add a UDP listener

• Add an HTTP listener

• Add an HTTPS listener

Feature

Supported listener

References

Primary/secondary server groups

UDP

TCP

Create and manage a primary/secondary server group

Feature

Supported listener

References

HTTP headers

HTTP

HTTPS

• Add an HTTP listener

• Add an HTTPS listener

Feature

Supported listener

References

Domain name-based and URL-based forwarding rules

HTTP

HTTPS

Forward requests based on domain names or URLs

Feature

Supported listener

References

Cross-zone deployment

HTTPS

HTTP

UDP

TCP

Regions that support CLB

Feature

Supported listener

References

HTTP health checks for TCP listeners

TCP

Add a TCP listener

Feature

Supported listener

References

Virtual private clouds (VPCs)

HTTPS

HTTP

UDP

TCP

Create and manage CLB instances

Feature

Supported listener

References

HTTPS

HTTPS

Add an HTTPS listener

Feature

Supported listener

References

Release of SLB

HTTP

TCP

Overview of CLB instances