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SOA-C03 practice question: Load balancer and Route 53 health checks (1 of 2)

Reliability and Business Continuity A free question from our original SOA-C03 practice exam. Try it, then open the answer to see why each option is right or wrong.

A dental chain moved its patient portal behind an Application Load Balancer. The target group uses the default health check settings with the path /. The application sends unauthenticated requests to / a 302 redirect to /login. Every target is marked unhealthy, and the ALB access logs show the health check requests arriving at the instances. What should a CloudOps engineer do so that healthy targets are reported correctly?

Choose one answer.

  1. A. Raise the healthy threshold count and the health check interval so that targets have more time to answer the checks.
  2. B. Allow inbound traffic from the load balancer's security group in the instances' security group on the application port.
  3. C. Change the health check protocol to TCP so that the load balancer only checks that the application port is open.
  4. D. Change the health check path to a lightweight page, such as /health, that returns HTTP 200.
Show the answer and explanation

Answer: D

Explanation

An ALB marks a target healthy only when the health check response code matches the success codes, which default to 200. A redirect on the health check path fails every check even though the application works. Pointing the check at a page that returns 200, or adding 302 to the success codes, fixes it.

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