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Given this Auto Scaling group configuration:

medium📝 service behavior Q13 of 15
AWS - Auto Scaling
Given this Auto Scaling group configuration:
MinSize=1, MaxSize=3, DesiredCapacity=2
What happens if the load increases and the group scales out to 3 instances, then the load drops suddenly?
AThe group will scale in to 1 instance, respecting MinSize
BThe group will keep 3 instances running regardless of load
CThe group will scale in to 0 instances
DThe group will scale in to 2 instances, the DesiredCapacity
Step-by-Step Solution
Solution:
  1. Step 1: Understand scaling limits

    MinSize=1 means the group will never go below 1 instance, MaxSize=3 means it can scale up to 3.
  2. Step 2: Analyze behavior on load drop

    When load drops, Auto Scaling reduces instances but not below MinSize, so it scales down to 1.
  3. Final Answer:

    The group will scale in to 1 instance, respecting MinSize -> Option A
  4. Quick Check:

    MinSize limits minimum instances [OK]
Quick Trick: MinSize sets the lowest number of instances [OK]
Common Mistakes:
  • Thinking DesiredCapacity is fixed after scaling
  • Assuming scaling can go below MinSize
  • Believing MaxSize limits minimum instances

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