CV0-003 Question #425: Real Exam Question with Answer & Explanation

The correct answer is C: Review auto-scaling policies to detect a misconfiguration.. Rapid repeated scale-up and scale-down events (thrashing) indicate misconfigured auto-scaling policies, such as overlapping thresholds or missing cooldown periods.

Troubleshooting

Question

While reviewing the auto-scaling events for a web application, a cloud engineer identified that the application upsized and downsized multiple times within the last hour. Which of the following should the cloud engineer do NEXT?

Options

AAdd more systems into the scaling group.
BReview the load balancer configuration settings.
CReview auto-scaling policies to detect a misconfiguration.
DMonitor auto-scaling events for the next 24 hours.

Explanation

Rapid repeated scale-up and scale-down events (thrashing) indicate misconfigured auto-scaling policies, such as overlapping thresholds or missing cooldown periods.

Common mistakes.

A. Adding more instances to the scaling group does not address the root cause of thrashing and may increase costs without resolving the flapping behavior.
B. Load balancer configuration governs traffic distribution across existing instances, not the triggers that initiate scaling events, so it is not the source of this problem.
D. Monitoring for an additional 24 hours delays remediation when the likely cause - policy misconfiguration - can be investigated and corrected immediately.

Concept tested. Auto-scaling policy thrashing and cooldown misconfiguration

Reference. https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-scaling-cooldowns.html

Topics

#auto-scaling#scaling policies#misconfiguration#performance tuning

Community Discussion

No community discussion yet for this question.

Full CV0-003 Practice