AWS - Auto Scaling
A scheduled scaling action is set to increase capacity at 9 AM UTC daily, but the Auto Scaling group does not scale. Which misconfiguration is the most likely cause?
A scheduled scaling action is set to increase capacity at 9 AM UTC daily, but the Auto Scaling group does not scale. Which misconfiguration is the most likely cause?
medium📝 Debug Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Review scheduled scaling behavior
If a scheduled action has a StartTime in the past and no Recurrence, it triggers only once and won't trigger again.Step 2: Identify why scaling does not occur
Since the action is daily but lacks recurrence, it won't run after the initial time.Final Answer:
The scheduled action's StartTime is set in the past and no recurrence is defined -> Option DQuick Check:
Recurring schedules require Recurrence field [OK]
Quick Trick: No recurrence means one-time past StartTime won't trigger again [OK]
Common Mistakes:
- Assuming scaling fails because no instances are running
- Confusing scheduled scaling with metric-based scaling policies
- Setting desired capacity above max capacity causes failure
Master "Auto Scaling" in AWS
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