AWS - Architecture Best Practices
You configure an Auto Scaling group across two AZs with minimum capacity 4. If one AZ becomes unavailable, what is the expected behavior?
You configure an Auto Scaling group across two AZs with minimum capacity 4. If one AZ becomes unavailable, what is the expected behavior?
medium📝 Predict Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Auto Scaling group behavior
Auto Scaling maintains desired capacity by launching instances in healthy AZs.Step 2: Replace instances in healthy AZ
If one AZ fails, Auto Scaling compensates by launching instances in the other AZ.Final Answer:
Auto Scaling launches replacement instances in the healthy AZ to maintain capacity -> Option BQuick Check:
Auto Scaling maintains capacity across healthy AZs [OK]
Quick Trick: Auto Scaling keeps capacity by shifting instances to healthy AZs [OK]
Common Mistakes:
- Thinking Auto Scaling reduces capacity automatically
- Assuming Auto Scaling stops instances on AZ failure
- Believing instances launch in failed AZ
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