ELB Target이 전부 unhealthy할 경우 traffic 전달됨.

- 개요

ELB Target이 전부 unhealthy할 경우 traffic 전달됨.

 

 

- 관련 문서

If a target group contains only unhealthy registered targets, the load balancer routes requests to all those targets, regardless of their health status. 
This means that if all targets fail health checks at the same time in all enabled Availability Zones, the load balancer fails open. 
The effect of the fail-open is to allow traffic to all targets in all enabled Availability Zones, regardless of their health status, based on the load balancing algorithm.

https://docs.aws.amazon.com/elasticloadbalancing/latest/application/target-group-health-checks.html