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?
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
Step-by-Step Solution
Solution:
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.Step 2: Confirm DesiredCapacity enforcement
DesiredCapacity is 2, so Auto Scaling will launch a new instance to keep 2 running.Final Answer:
Auto Scaling launches a new instance to maintain DesiredCapacity -> Option BQuick 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
Master "Auto Scaling" in AWS
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