AWS - Architecture Best Practices
An AWS Auto Scaling group spans two Availability Zones (AZs). If one AZ becomes unreachable, what is the expected behavior of the Auto Scaling group?
An AWS Auto Scaling group spans two Availability Zones (AZs). If one AZ becomes unreachable, what is the expected behavior of the Auto Scaling group?
medium📝 Predict Output Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Auto Scaling behavior
Auto Scaling maintains the desired number of instances by launching new ones if some become unhealthy or unavailable.Step 2: Consider AZ failure impact
If one AZ fails, Auto Scaling launches instances in the remaining healthy AZ to keep capacity.Final Answer:
It launches new instances in the healthy AZ to maintain desired capacity -> Option AQuick Check:
Auto Scaling replaces unhealthy instances automatically [OK]
Quick Trick: Auto Scaling maintains capacity by launching in healthy AZs [OK]
Common Mistakes:
- Assuming Auto Scaling stops all instances on AZ failure
- Thinking traffic routes to failed AZ instances
- Believing Auto Scaling disables without manual action
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