This topic describes the release notes for Server Load Balancer (SLB) and provides links to the relevant references.
January 2022
| Feature | Description | Reference |
|---|---|---|
| Backend servers can be added to Application Load Balancer (ALB) across virtual private clouds (VPCs) in different regions. | Backend servers can be specified for 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 VPC-connected backend servers to an ALB instance across regions |
| On-premises servers can be added to Application Load Balancer (ALB). | 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. | Connect an on-premises server to ALB |
November 2021
| Feature | Description | Reference |
|---|---|---|
| A higher level of service uptime is guaranteed for Application Load Balancer (ALB) instances that support multi-zone deployment. | The service uptime guaranteed for Application Load Balancer (ALB) instances that support multi-zone deployment is improved from 99.95% to 99.995%. | SLB Service Level Agreement |
September 2021
| Feature | Description | Reference |
|---|---|---|
| ALB resource plans (subscription) are supported. | Subscription resource plans are provided by ALB. After an ALB resource plan takes effect, it can automatically offset the Load Balancer Capacity Unit (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. | Introduction to ALB resource plans |
August 2021
| Feature | Description | Reference |
|---|---|---|
| EIP bandwidth plans can be associated with ALB. | An EIP can be associated with an ALB instance and EIP bandwidth plan when you create the ALB instance. After the EIPs are associated with an EIP bandwidth plan, the EIPs share the bandwidth of the EIP bandwidth plan. This reduces bandwidth costs. | Quick start |
July 2021
| Feature | Description | Reference |
|---|---|---|
| Proxy Protocol can be used by CLB to retrieve 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 | Reference |
|---|---|---|
| Mutual authentication is supported by ALB. | Mutual authentication is supported by HTTPS listeners of ALB. | Add an HTTPS listener |
| Outbound forwarding rules are supported by ALB. | Inbound and outbound forwarding rules are both supported by ALB. | Manage forwarding rules for a listener |
January 2021
| Feature | Description | Reference |
|---|---|---|
| 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 in the CloudMonitor console |
October 2020
| Feature | Description | Reference |
|---|---|---|
| Public preview of ALB is available. | A free trial of ALB, a load balancing service intended for Layer 7 is available. | What is Application Load Balancer (ALB)? |
July 2019
| Feature | Region | Listener | Reference |
|---|---|---|---|
| Health checks are supported. | China (Hangzhou)
China (Shanghai) China (Qingdao) China (Beijing) China (Zhangjiakou) China (Hohhot) China (Shenzhen) China (Chengdu) |
TCP UDP HTTP HTTPS |
Execute a health check script |
| SLB overview page is available. | China (Hangzhou)
China (Shanghai) China (Qingdao) China (Beijing) China (Zhangjiakou) China (Hohhot) China (Shenzhen) China (Chengdu) |
TCP UDP HTTP HTTPS |
- |
June 2019
| Feature | Region | Listener | Reference |
|---|---|---|---|
| UDP and TCP listeners within the same SLB instance that can listen on the same port are supported in more regions. | UAE (Dubai)
Australia (Sydney) UK (London) Germany (Frankfurt) US (Silicon Valley) US (Virginia) Indonesia (Jakarta) Japan (Tokyo) India (Mumbai) Singapore (Singapore) Malaysia (Kuala Lumpur) China (Hong Kong) China (Shenzhen) China (Hohhot) China (Qingdao) China (Chengdu) China (Zhangjiakou) China (Shanghai) |
TCP UDP |
Add a TCP listener |
| Deletion protection can be enabled for instances. | China (Hangzhou)
China (Shanghai) China (Qingdao) China (Beijing) China (Zhangjiakou) China (Hohhot) China (Shenzhen) China (Chengdu) |
UDP TCP HTTP HTTPS |
Enable deletion protection |
| Backend servers can be added by specifying secondary IP addresses of elastic network interfaces (ENIs) that are attached to ECS instances. | China (Hangzhou)
China (Shanghai) China (Qingdao) China (Beijing) China (Zhangjiakou) China (Hohhot) China (Shenzhen) China (Chengdu) |
UDP TCP HTTP HTTPS |
Add backend servers by specifying their ENIs |
May 2019
| Feature | Region | Listener | Reference |
|---|---|---|---|
| A port can be listened by both a UDP and a TCP listener within the same SLB instance. | UK (London)
Australia (Sydney) UAE (Dubai) Germany (Frankfurt) US (Silicon Valley) US (Virginia) Indonesia (Jakarta) Japan (Tokyo) India (Mumbai) Singapore (Singapore) |
UDP TCP |
Add a TCP listener |
| Elliptic curve keys are supported. | UK (London) | HTTPS | Certificate requirements |
| TLS 1.3 | UK (London) | HTTPS | Manage TLS security policies |
| The GET method for health checks are supported by Layer 7 listeners. | India (Mumbai) |
HTTPS HTTP |
Add an HTTP listener |
April 2019
| Feature | Region | Listener | Reference |
|---|---|---|---|
| Available resources in zones can be queried by calling the API. | All regions |
HTTPS HTTP UDP TCP |
DescribeAvailableResource |
| IPv6 is supported. | Regions and zones that support IPv6 CLB instances |
HTTPS HTTP UDP TCP |
Overview of IPv6 CLB instances |
January 2019
| Feature | Region | Listener | Reference |
|---|---|---|---|
| Idle instance management is supported. | All regions |
HTTPS HTTP UDP TCP |
Manage idle instances |
December 2018
| Feature | Region | Listener | Reference |
|---|---|---|---|
| API Inspector | All regions |
HTTPS HTTP UDP TCP |
API Inspector |
November 2018
| Feature | Region | Listener | Reference |
|---|---|---|---|
| HTTP requests can be redirected to HTTPS. | All regions |
HTTP |
Redirect HTTP requests to HTTPS |
October 2018
| Feature | Region | Listener | Reference |
|---|---|---|---|
| Backend servers can be added by specifying ENIs that are attached to ECS instances in the console. | All regions |
HTTPS HTTP UDP TCP |
Add backend servers by specifying their ENIs |
September 2018
| Feature | Region | Listener | Reference |
|---|---|---|---|
| Certificates provided by Alibaba Cloud Certificate Management Service can be used. | All regions |
HTTPS HTTP UDP TCP |
Certificate overview |
| IPv6 is supported. | China (Beijing): Zone F and Zone G |
HTTPS HTTP UDP TCP |
Overview of IPv6 CLB instances |
| Advanced configurations can be used in forwarding rules, including custom scheduling algorithms, session persistence, and health checks. | All regions |
HTTP HTTPS |
Forward requests based on domain names or URLs |
August 2018
| Feature | Region | Listener | Reference |
|---|---|---|---|
| The ports and weights of multiple backend servers can be modified at a time. | All regions |
HTTPS HTTP UDP TCP |
Add a default backend server |
July 2018
| Feature | Region | Listener | Reference |
|---|---|---|---|
| Resource quotas can be queried by calling the API. | All regions |
HTTPS HTTP UDP TCP |
- |
| The console on the Alibaba Cloud China site is updated. | All regions |
HTTPS HTTP UDP TCP |
Create a CLB instance |
| Consistent hash algorithms are supported. The QUIC protocol and UDP session persistence are supported by Layer 4 listeners. |
Japan (Tokyo) Australia (Sydney) Malaysia (Kuala Lumpur) Indonesia (Jakarta) Germany (Frankfurt) US (Silicon Valley) US (Virginia) UAE (Dubai) China (Hohhot) |
UDP TCP |
Add a TCP listener |
June 2018
| Feature | Region | Listener | Reference |
|---|---|---|---|
| Custom TLS versions are supported. | All regions | HTTPS | Manage TLS security policies |
| IPv6 is supported. | China (Hangzhou): Zone E and Zone F |
HTTPS HTTP UDP TCP |
Overview of IPv6 CLB instances |
May 2018
| Feature | Region | Listener | Reference |
|---|---|---|---|
| HTTP/2 is supported. | All regions | HTTPS | Add an HTTPS listener |
| Server Name Indication (SNI) is supported to allow multiple certificates to be associated with SLB. | All regions | HTTPS | Configure a CLB instance to serve multiple domain names over HTTPS |
| Blacklists and whitelists can be configured to control access to SLB. | All regions |
HTTPS HTTP UDP TCP |
|
| Access logs are supported. | All regions |
HTTP HTTPS |
Configure access logs |
| Backend servers can be added by specifying ENIs that are attached to ECS instances in OpenAPI. | All regions |
HTTPS HTTP UDP TCP |
AddBackendServers |
April 2018
| Feature | Region | Listener | Reference |
|---|---|---|---|
| Custom timeout periods can be specified for Layer 7 listeners. | All regions |
HTTP HTTPS |
Add an HTTP listener |
February 2018
| Feature | Region | Listener | Reference |
|---|---|---|---|
| The WS and WSS protocols are supported. | All regions |
HTTP HTTPS |
Overview of WebSocket and WebSocket Secure |
| HTTP/2 is supported. | All regions |
HTTPS |
Add an HTTP listener |
November 2017
| Feature | Region | Listener | Reference |
|---|---|---|---|
| Alibaba Cloud Security thresholds of SLB instances can be viewed. | All regions |
HTTPS HTTP UDP TCP |
Anti-DDoS Origin (Basic Edition) |
| High-performance instances are available. | All regions |
HTTPS HTTP UDP TCP |
FAQ about high-performance CLB instances |
August 2017
| Feature | Region | Listener | Reference |
|---|---|---|---|
| Layer 7 monitoring metrics such as QPS are supported. | All regions |
HTTP HTTPS |
View monitoring data in the console |
| Custom timeout periods can be specified for Layer 4 listeners. | All regions |
TCP |
Add a TCP listener |
| The bandwidth of an SLB instance can be shared by its listeners. | All regions |
HTTPS HTTP UDP TCP |
Add a TCP listener |
February 2017
| Feature | Region | Listener | Reference |
|---|---|---|---|
| Primary/secondary server groups are supported. | All regions |
UDP TCP |
Create a primary/secondary server group |
November 2016
| Feature | Region | Listener | Reference |
|---|---|---|---|
| HTTP headers can be added. | All regions |
HTTP HTTPS |
Add an HTTP listener |
March 2016
| Feature | Region | Listener | Reference |
|---|---|---|---|
| Domain name-based and URL-based forwarding rules are supported. | All regions |
HTTP HTTPS |
Forward requests based on domain names or URLs |
December 2015
| Feature | Region | Listener | Reference |
|---|---|---|---|
| Cross-zone deployment is supported. | All regions |
HTTPS HTTP UDP TCP |
Regions and zones that support CLB |
July 2015
| Feature | Region | Listener | Reference |
|---|---|---|---|
| HTTP health checks are supported by TCP listeners. | All regions |
TCP |
Add a TCP listener |
April 2015
| Feature | Region | Listener | Reference |
|---|---|---|---|
| VPCs are supported. | All regions |
HTTPS HTTP UDP TCP |
Create a CLB instance |
January 2015
| Feature | Region | Listener | Reference |
|---|---|---|---|
| HTTPS is supported. | All regions | HTTPS | Add an HTTPS listener |
February 2014
| Feature | Region | Listener | Reference |
|---|---|---|---|
| SLB is released. | All regions |
HTTP TCP |
Overview |