You want to ensure your Auto Scaling group scales out only when the ELB's average latency exceeds 200ms for 5 minutes. Which combination should you use?

hard📝 Architecture Q8 of 15

AWS - Auto Scaling

AManually increase desired capacity when latency is high.

BConfigure Auto Scaling group to scale based on CPU utilization only.

CSet ELB health check timeout to 200ms.

DCreate a CloudWatch alarm on ELB latency metric and use it as a scaling policy trigger.

Step-by-Step Solution

Solution:

Step 1: Identify metric for scaling trigger
ELB latency metric reflects response time relevant for scaling.
Step 2: Use CloudWatch alarm to trigger Auto Scaling
CloudWatch alarm on latency triggers scaling policy automatically.
Final Answer:
Create CloudWatch alarm on ELB latency and use it to scale. -> Option D
Quick Check:
CloudWatch alarm triggers scaling = A [OK]

Quick Trick: Use CloudWatch alarms on ELB metrics for scaling triggers [OK]

Common Mistakes:

MISTAKES

Using CPU utilization instead of ELB latency
Misconfiguring health check timeout as scaling trigger
Relying on manual scaling only

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You want to ensure your Auto Scaling group scales out only when the ELB's average latency exceeds 200ms for 5 minutes. Which combination should you use?

Step 1: Identify metric for scaling trigger

Step 2: Use CloudWatch alarm to trigger Auto Scaling

Final Answer:

Quick Check:

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