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SLB Multi-Zone with Multi-Zone Backend Servers

ID: rule:aliyun:slb-all-listener-servers-multi-zone
Severity: high
IaC Types: ROS, Terraform

Description​

SLB instances should be multi-zone, with master_zone_id and slave_zone_id configured to different zones.

Reason for Violation​

Single zone deployment or single zone backend servers lack high availability and may lead to service interruption during zone failure.

Recommendation​

Configure SLB instances with different master_zone_id and slave_zone_id for high availability.

Resource Types​

  • ROS: ALIYUN::SLB::LoadBalancer
  • Terraform: alicloud_slb_load_balancer