Alibaba Cloud – Server Load Balancer (SLB), Purchasing
This is where you configure SLB Instance Regions, Availability Zones, Instance Name, Instance Type (Internet or Intranet), Instance Spec, Bandwidth and Quantity

Alibaba Cloud – Server Load Balancer (SLB), Conformation Order

Alibaba Cloud – Server Load Balancer (SLB), Instances
Server Load Balancer Instances Tab

Alibaba Cloud – Server Load Balancer (SLB), Configuration

Alibaba Cloud – Server Load Balancer (SLB), Configuration, Backend Server Groups
There are three Server Groups that you could add ECS Instances to the SLB Instance

* Screenshots captured from Alibaba Cloud Console on Oct 20, 2019.