This topic describes the release notes for Server Load Balancer (SLB) and provides links to the relevant references.

December 2022

Feature Type Description References
NLB instances can be added to security groups. New Network Load Balancer (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
Mutual authentication is supported by NLB listeners that use TCP over SSL. Update Mutual authentication is supported by Network Load Balancer (NLB) listeners that use TCP over SSL. Create a listener that uses SSL over TCP
ALB is integrated with Quota Center. New Application Load Balancer (ALB) is integrated with Quota Center. You can apply for and view general quotas and privileges of ALB in the Quota Center console.

November 2022

Feature Change type Description References
NLB is available for commercial use. New The public preview and time-limited free trial of Network Load Balancer (NLB) have ended. NLB is available for commercial use. [November 8, 2022] Announcement on the commercialization of NLB
Listening by port range is supported by NLB. Update Listening by port range is supported by Network Load Balancer (NLB). After you enable this feature, NLB can listen on all the ports in a specified port range.
Terraform is supported by NLB. Update Terraform can be used to create and manage NLB instances. Deploy and manage NLB instances
Anycast EIPs can be associated with NLB instances. New Anycast EIPs can be associated with Network Load Balancer (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 ALB instance. Change the network type of an NLB instance
The source code of ALB Ingresses is 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.

October 2022

Feature Change type Description References
Anycast EIPs can be associated with ALB instances. New feature You can associate Anycast EIPs with Application Load Balancer (ALB) instances to enable the NLB 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.
The information about the regions that support WAF-enabled ALB instances is updated. 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 can be mirrored to a server group of the IP type by using ALB. Update You can add a forwarding rule to a listener of Application Load Balancer (ALB) to mirror traffic to a server group of the IP type. Create a forwarding rule
Proxy Protocol can be used by NLB to preserve client IP addresses. New Proxy Protocol is supported by Network Load Balancer (NLB) to pass client IP addresses to backend servers. Obtain client IP addresses
On-premises servers can be added to NLB. New Backend servers can be specified by IP address for a server group of Network Load Balancer (NLB). You can use NLB and Cloud Enterprise Network (CEN) transit routers to enable NLB to forward requests to servers in a data center. Add servers in data centers to an NLB instance

September 2022

Feature Change type Description References
IPv6 is supported by ALB. New feature IPv6 is supported by Application Load Balancer (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.

August 2022

Feature Change type Description References
The advanced features of ALB Ingresses are updated. Update Alibaba Cloud ALB Ingresses support cross-origin resource sharing (CORS), persistent TCP connections, and QPS throttling. Advanced features

July 2022

Feature Change type Description References
NLB is released for public preview. New feature Network Load Balancer (NLB) is released for 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.
Consistent hashing based on URL parameters is supported by ALB. Update Consistent hashing based on URL parameters is supported by Application Load Balancer (ALB). Requests for the same URL parameter are forwarded to the same backend server. Create and manage a server group
CORS is supported by forwarding rules of ALB. Update CORS is supported by forwarding rules of Application Load Balancer (ALB). If the response is returned from a URL different from the one requested by the client, it indicates that CORS is enabled. The URL includes a protocol, a domain name, and a port. Manage forwarding rules for a listener
Regular expressions can be specified as the 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 Application Load Balancer (ALB) listeners. You can specify a regular expression as the condition of a domain name-based or URL-based forwarding rule for rewrites or redirects. Create a domain name-based or URL-based forwarding rule

June 2022

Feature Change type Description References
Google Remote Procedure Call (gRPC) is supported by ALB. New feature The gRPC protocol can be used by Application Load Balancer (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.
WAF-enabled ALB instances are available. Update WAF-enabled Application Load Balancer (ALB) instances are available. As an upgrade from standard ALB instances, WAF-enabled ALB instances are integrated with Web Application Firewall (WAF) 3.0 to protect your web applications. Network traffic is filtered by WAF before it is routed to ALB listeners.
WAF is supported by 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.

N/A

March 2022

Feature Change type Description References
Functions of Function Compute can be specified 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

February 2022

Feature Change type Description References
The gRPC protocol is supported by 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". Configure the HTTPS or gRPC protocol
ALB Ingresses can be deployed based on serverless Kubernetes (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 in Knative

January 2022

Feature Change type Description References
Servers across virtual private clouds (VPCs) in different regions can be added to Application Load Balancer (ALB). New feature Backend servers can be specified for the server groups of Application Load Balancer (ALB) by IP address. Requests received by ALB can be routed to servers in other regions by using Cloud Enterprise Network (CEN) transit routers. Add ECS instances in a VPC to an ALB instance in a different region
On-premises servers can be specified as the backend servers of Application Load Balancer (ALB). New feature Backend servers can be specified in the server groups of Application Load Balancer (ALB) by IP address. Requests received by ALB can be routed to on-premises servers by using CEN transit routers and other services. Specify an on-premises server as a backend server of ALB

November 2021

Feature Description References
ALB Ingresses can be created in the ACK console. ALB Ingresses can be created in the ACK console. You can create Ingress rules in ALB Ingresses and customize Ingress configurations. ALB Ingresses use ALB instances to balance the traffic loads at Layer 7. Access Services by using an ALB Ingress
A higher level of service uptime is guaranteed by Application Load Balancer (ALB) instances that support multi-zone deployment. The service uptime guaranteed by Application Load Balancer (ALB) instances that support multi-zone deployment is improved from 99.95% to 99.995%. SLB Service Level Agreement

October 2021

Feature Description References
ALB Ingresses are available. 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 Container Service for Kubernetes (ACK) or serverless Kubernetes (ASK) clusters, ALB Ingresses meet the requirements for ultra-high elasticity and balancing of heavy traffic loads at Layer 7. ALB Ingress overview

September 2021

Feature Description References
ALB resource plans (subscription) are available. Subscription resource plans are provided by ALB. After an ALB resource plan takes effect, it automatically offsets the Load Balancer Capacity Unit (LCU) fees and instance fees for ALB. Compared with the pay-as-you-go billing method, ALB resource plans can be 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.

August 2021

Feature Description References
EIP bandwidth plans can be associated with ALB. An existing EIP and an EIP bandwidth plan can be associated with an ALB instance when you create the ALB instance. After the ALB instance is associated with an EIP bandwidth plan, the ALB instance shares the bandwidth of the EIP bandwidth plan. This reduces bandwidth costs. Use an ALB instance to provide IPv4 services

July 2021

Feature Description References
Proxy Protocol can be used by CLB to preserve client IP addresses. 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 Proxy Protocol for a Layer 4 listener to retrieve client IP addresses

March 2021

Feature Description References
Mutual authentication is supported by ALB. Mutual authentication is supported by HTTPS listeners of ALB.
Outbound forwarding rules are supported by ALB. Inbound and outbound forwarding rules are supported by ALB. Manage forwarding rules for a listener

January 2021

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

October 2020

Feature Description References
ALB is released for public preview. A free trial for ALB, a load balancing service intended for Layer 7, is available. What is ALB?

July 2019

Feature Listener References
Health checks are supported.

TCP

UDP

HTTP

HTTPS

Execute a health check script
The Overview page of SLB is available.

TCP

UDP

HTTP

HTTPS

-

June 2019

Feature Listener References
UDP and TCP listeners that belong to the same SLB instance and listen on the same port are supported in more regions.

TCP

UDP

Backend servers can be added by specifying secondary IP addresses of elastic network interfaces (ENIs) that are attached to ECS instances.

UDP

TCP

HTTP

HTTPS

Add backend servers by specifying ENIs

May 2019

Feature Listener References
A port can be listened by both a UDP and a TCP listener within the same SLB instance.

UDP

TCP

Elliptic curve keys are supported. HTTPS Certificate requirements
TLS 1.3 is supported. HTTPS Manage TLS security policies
The GET method for health checks is supported by Layer 7 listeners.

HTTPS

HTTP

April 2019

Feature Listener References
Available resources in zones can be queried by calling the API.

HTTPS

HTTP

UDP

TCP

DescribeAvailableResource
IPv6 is supported.

HTTPS

HTTP

UDP

TCP

Overview of IPv6 CLB instances

January 2019

Feature Listener References
Idle instance management is supported.

HTTPS

HTTP

UDP

TCP

Manage idle CLB instances

November 2018

Feature Listener References
HTTP requests can be redirected to HTTPS.

HTTP

Redirect HTTP requests to HTTPS

October 2018

Feature Listener References
Backend servers can be added by specifying ENIs that are attached to ECS instances in the console.

HTTPS

HTTP

UDP

TCP

Add backend servers by specifying ENIs

September 2018

Feature Listener References
Certificates provided by Alibaba Cloud Certificate Management Service can be used.

HTTPS

HTTP

UDP

TCP

Overview
IPv6 is supported.

HTTPS

HTTP

UDP

TCP

Overview of IPv6 CLB instances
Advanced configurations, such as custom scheduling algorithms, session persistence, and health checks, are supported in forwarding rules.

HTTP

HTTPS

Forward requests based on domain names or URLs

August 2018

Feature Listener References
The ports and weights of multiple backend servers can be modified at a time.

HTTPS

HTTP

UDP

TCP

July 2018

Feature Listener References
Resource quotas can be queried by calling the API.

HTTPS

HTTP

UDP

TCP

-
The console on the Alibaba Cloud China site is updated.

HTTPS

HTTP

UDP

TCP

Create and manage a CLB instance
Consistent hash algorithms are supported. The QUIC protocol and UDP session persistence are supported by Layer 4 listeners.

UDP

TCP

June 2018

Feature Listener References
Custom TLS versions are supported. HTTPS
IPv6 is supported.

HTTPS

HTTP

UDP

TCP

Overview of IPv6 CLB instances

May 2018

Feature Listener References
HTTP/2 is supported. HTTPS Add an HTTPS listener
Server Name Indication (SNI) is supported to allow multiple certificates to be associated with SLB. HTTPS Configure a CLB instance to serve multiple domain names over HTTPS
Blacklists and whitelists can be configured to enforce access control.

HTTPS

HTTP

UDP

TCP

Access logs are supported.

HTTP

HTTPS

Configure access logs
Backend servers can be added by specifying ENIs that are attached to ECS instances in OpenAPI Explorer.

HTTPS

HTTP

UDP

TCP

AddBackendServers

April 2018

Feature Listener References
Custom timeout periods can be specified for Layer 7 listeners.

HTTP

HTTPS

February 2018

Feature Listener References
The WebSocket and WebSocket Secure protocols are supported.

HTTP

HTTPS

WebSocket and WebSocket Secure support FAQ
HTTP/2 is supported.

HTTPS

Add an HTTP listener

November 2017

Feature Listener References
Alibaba Cloud Security thresholds of SLB instances can be viewed.

HTTPS

HTTP

UDP

TCP

Anti-DDoS Origin Basic
High-performance SLB instances are available.

HTTPS

HTTP

UDP

TCP

FAQ about high-performance CLB instances

August 2017

Feature Listener References
Layer 7 monitoring metrics such as queries per second (QPS) are supported.

HTTP

HTTPS

View monitoring information about CLB
Custom timeout periods can be specified for Layer 4 listeners.

TCP

Add a TCP listener
The bandwidth of an SLB instance can be shared by its listeners.

HTTPS

HTTP

UDP

TCP

February 2017

Feature Listener References
Primary/secondary server groups are supported.

UDP

TCP

Create and manage a primary/secondary server group

November 2016

Feature Listener References
HTTP headers can be added.

HTTP

HTTPS

March 2016

Feature Listener References
Domain name-based and URL-based forwarding rules are supported.

HTTP

HTTPS

Forward requests based on domain names or URLs

December 2015

Feature Listener References
Cross-zone deployment is supported.

HTTPS

HTTP

UDP

TCP

Regions that support CLB

July 2015

Feature Listener References
HTTP health checks are supported by TCP listeners.

TCP

Add a TCP listener

April 2015

Feature Listener References
VPCs are supported.

HTTPS

HTTP

UDP

TCP

Create and manage a CLB instance

January 2015

Feature Listener References
HTTPS is supported. HTTPS Add an HTTPS listener

February 2014

Feature Listener References
SLB is released.

HTTP

TCP

CLB overview