Add Backend Servers to a Listener

Backend servers receive traffic forwarded by the listener. You can configure backend servers in one of the following ways:

• By Instance: Select backend servers directly from existing elastic compute instances.

• By IP Address: Manually specify backend server IP addresses.

After the listener is created, you can add backend servers to the listener by going to the listener list page and selecting Actions > Add Backend Server.

By Instance

When adding backend servers by Instance, you select compute instances directly from the resource list. Backend services run on cloud instances and you can have a simpler, cloud-native management.

Instance

Select the elastic compute instance to add.

The instance and the load balancer must be in the same-region subnet under one global VPC.

Private IPv4

The private IP address of the elastic compute instance, used by the listener for request forwarding and health checks.

Port

The target port for request forwarding and health checks.

Specify only one port in the range from 1 to 65535. If empty, it will follow the listening port configuration.

Weight

The proportion of requests allocated to each backend server. The higher the weight, the more requests the server will receive.

Weight ranges from 0 to 65535, and the default weight is 100. A weight of 0 means the server will not accept new requests.

Click Add Backend Server to add more backend servers.

By IP Address

When adding backend servers by Private IP, you manually specify the private IP addresses of backend servers. Backend servers are identified only by IP. It is a more flexible and IP-based configuration.

Private IPv4

The private IP address of the elastic compute instance, used by the listener for request forwarding and health checks.

Port

The target port for request forwarding and health checks.

Specify only one port in the range from 1 to 65535. If empty, it will follow the listening port configuration.

Weight

The proportion of requests allocated to each backend server. The higher the weight, the more requests the server will receive.

Weight ranges from 0 to 65535, and the default weight is 100. A weight of 0 means the server will not accept new requests.

Click Add Private IPv4 to add more private IPv4 addresses.

Hint

You can also go to Backend server list > Actions > Remove on Details page to remove a backend server.