Question

A CloudOps engineer manages an Auto Scaling group behind an Application Load Balancer. The application takes about 4 minutes to fully initialize and pass ALB health checks after an instance launches. The ASG uses ELB health checks. Recently, newly launched instances are being terminated and replaced repeatedly before the application finishes starting, creating a launch-terminate loop. Which configuration change resolves this issue?

Accepted Answer

Increase the Auto Scaling group health check grace period to a value greater than the application initialization time (e.g., 300 seconds).

Answer

Change the ASG health check type from ELB back to EC2 so only instance status checks are evaluated.

Answer

Increase the ALB target group healthy threshold count so more consecutive checks are required before marking instances healthy.

Answer

Reduce the ALB target group health check interval so instances are evaluated more frequently during startup.