Given an Auto Scaling group with MinSize=1, MaxSize=4, and DesiredCapacity=3, what will be the number of instances after a scale-in event that decreases DesiredCapacity by 2?

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AWS - Auto Scaling

Given an Auto Scaling group with MinSize=1, MaxSize=4, and DesiredCapacity=3, what will be the number of instances after a scale-in event that decreases DesiredCapacity by 2?

A3 instances

B2 instances

C1 instance

D0 instances

Step-by-Step Solution

Solution:

Step 1: Calculate new DesiredCapacity after scale-in
DesiredCapacity 3 minus 2 equals 1.
Step 2: Check against MinSize
New DesiredCapacity 1 equals MinSize 1, so scaling down to 1 instance is allowed.
Final Answer:
1 instance -> Option C
Quick Check:
DesiredCapacity respects MinSize after scaling [OK]

Quick Trick: DesiredCapacity never goes below MinSize after scaling [OK]

Common Mistakes:

MISTAKES

Forgetting MinSize limit and expecting 0 instances
Not subtracting scale-in amount correctly

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Given an Auto Scaling group with MinSize=1, MaxSize=4, and DesiredCapacity=3, what will be the number of instances after a scale-in event that decreases DesiredCapacity by 2?

Step 1: Calculate new DesiredCapacity after scale-in

Step 2: Check against MinSize

Final Answer:

Quick Check:

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