This topic describes the release notes for Server Load Balancer (SLB) and provides links to the relevant references.
March 2022
| Feature | Description | References |
|---|---|---|
| Functions of Function Compute can be specified as backend servers of ALB. | 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 |
January 2022
| Feature | Description | References |
|---|---|---|
| Servers across virtual private clouds (VPCs) in different regions can be added to Application Load Balancer (ALB). | 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 added to Application Load Balancer (ALB). | 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 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 |
|---|---|---|
| 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 | References |
|---|---|---|
| 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. |
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. | ALB quick start |
July 2021
| Feature | Description | References |
|---|---|---|
| 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 | References |
|---|---|---|
| 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 | 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 in the CloudMonitor console |
October 2020
| Feature | Description | References |
|---|---|---|
| ALB is released for public preview. | A free trial of ALB, a load balancing service intended for Layer 7, is available. | What is Application Load Balancer (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 |
Add a TCP listener |
| 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 their 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 |
Add a TCP listener |
| Elliptic curve keys are supported. | HTTPS | Certificate requirements |
| TLS 1.3 is supported. | HTTPS | TLS security policies |
| The GET method for health checks is supported by Layer 7 listeners. |
HTTPS HTTP |
Add an HTTP listener |
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 |
December 2018
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 their 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 can be used in forwarding rules, including custom scheduling algorithms, session persistence, and health checks. |
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 |
Add an ECS instance to the default server group |
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 |
Add a TCP listener |
June 2018
| Feature | Listener | References |
|---|---|---|
| Custom TLS versions are supported. | HTTPS | TLS security policies |
| 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 |
Add an HTTP listener |
February 2018
| Feature | Listener | References |
|---|---|---|
| The WS and WSS protocols are supported. |
HTTP HTTPS |
Overview of WebSocket and WebSocket Secure |
| 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 Edition) |
| 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 QPS are supported. |
HTTP HTTPS |
View monitoring data in the console |
| 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 |
Add a TCP listener |
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 |
Add an HTTP listener |
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 |