After ELB is created, you must configure the instance to forward traffic, bind the IP address of the backend server, and configure the listener.

Operation Steps

Log in to the ELB Console;
On the load balancer page, locate the created LB instance and click the instance name to go to the configuration page.
Configuring the listener: Click Add Listener.

Set the name of the listener. The name consists of 2-63 digits and can contain only English letters or numbers.

Select a load balancer protocol (TCP/UDP or HTTP/HTTPS) based on your service type and set the service port. You can add a description.

After the configuration is completed, click Next to go to the page for backend host group configuration.

Configuring backend servers: After the listener is configured, you can configure the host group.

Create a host group and set the host group name.

Search for a backend host by host name and IP address and select a host from the search result.

Parameter description:

Parameter	Description	Value Samples
Port	It is the service listening port of the backend ECS, with its value in the range of [1-65535];	123
Weight	Weight of backend VM The weight value determines the proportion of the requests processed by a backend ECS. For example, an ECS with a weight of 2 can process twice as many requests as an ECS with a weight of 1. The default weight is 1.	10

After a backend host is added, click Next to go to the page for LB mode and health check configuration.

Configure load mode and health check. After the host group is configured, you can configure LB mode and health check.

A backend host group is automatically selected. Three LB algorithms are available: Round robin, least connection and source address algorithm

The LB instance of the TCP protocol only supports session persistence in source IP mode.

Health check is enabled by default. The type can be TCP or HTTP. For TCP type LB, you can only select TCP. Configure health check parameters, and then click Create Now to complete the configuration.

Elastic Load Balancing

Configuring ELB