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SLB Default Server Group Multi-Zone

ID: rule:aliyun:slb-instance-default-server-group-multi-zone
Severity: medium
IaC Types: ROS, Terraform

Description​

The default server group of SLB instances should have resources distributed across multiple availability zones.

Reason for Violation​

Single-zone backend servers create a single point of failure and reduce availability.

Recommendation​

Add at least two backend_servers entries to distribute across multiple availability zones.

Resource Types​

  • ROS: ALIYUN::SLB::LoadBalancer
  • Terraform: alicloud_slb_backend_server