After you deploy an application on Serverless App Engine (SAE), you can bind an Internet-facing Server Load Balancer (CLB) instance to the application to enable Internet access. You can also bind an internal-facing CLB instance to the application to enable communication with other applications in the virtual private cloud (VPC) in which your application resides. Before you bind an CLB instance to your application, you must be familiar with the implementation and limits of CLB.
Introduction to CLB
Alibaba Cloud CLB is a service that helps you balance traffic loads. For more information, see CLB Documentation.
Limits of CLB
In SAE, CLB instances are used to access applications. A listener on an CLB instance exposes your business and enables access. However, limits exist when you use CLB instances. The following section describes the limits of CLB instances:
The listener that is configured in SAE cannot be modified in the CLB console.
The instances that are provided by SAE are non-Elastic Compute Service (ECS) containers, which are changeable and stateless. Therefore, the configuration that is used by a listener of an CLB instance to forward traffic to an SAE instance needs to be frequently changed. Each time you deploy an application or SAE restarts the application, the configurations of the application are reset. We recommend that you do not modify the same listener that is configured in SAE in the CLB console. The default configuration of the listener and the custom settings that you configure for the CLB instance in SAE overwrite the configurations that you modified in the CLB console.
If you delete the access configuration of an CLB instance that is purchased by using SAE, the CLB instance is released. You cannot purchase the same CLB instance. Proceed with caution.
If similar purchase and recycling behaviors exist in other services, proceed with caution if you use existing CLB instances. We recommend that you purchase new CLB instances in SAE or in CLB.
Shared-resource CLB instances are not supported in SAE.
Other limits
For more information about the limits of CLB, see Limits.