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An Auto Scaling group has MinSize=1, MaxSize=3, DesiredCapacity=2. If an instance fails health checks and is terminated, what will Auto Scaling do?

medium📝 Predict Output Q5 of 15
AWS - Auto Scaling
An Auto Scaling group has MinSize=1, MaxSize=3, DesiredCapacity=2. If an instance fails health checks and is terminated, what will Auto Scaling do?
ADo nothing and keep DesiredCapacity at 1
BLaunch a new instance to maintain DesiredCapacity
CIncrease MaxSize to 4 automatically
DTerminate all instances
Step-by-Step Solution
Solution:
  1. Step 1: Understand Auto Scaling health check behavior

    When an instance fails health checks, Auto Scaling terminates it and launches a replacement to maintain DesiredCapacity.
  2. Step 2: Confirm DesiredCapacity enforcement

    DesiredCapacity is 2, so Auto Scaling will launch a new instance to keep 2 running.
  3. Final Answer:

    Auto Scaling launches a new instance to maintain DesiredCapacity -> Option B
  4. Quick Check:

    Failed instance triggers replacement [OK]
Quick Trick: Failed instances get replaced to keep DesiredCapacity [OK]
Common Mistakes:
  • Thinking Auto Scaling reduces DesiredCapacity automatically
  • Assuming MaxSize changes automatically
  • Believing all instances get terminated on failure

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