AWS - Auto Scaling
You configured an Auto Scaling group with MinSize=1, MaxSize=5, DesiredCapacity=3. After deployment, you notice it only runs 1 instance. What is the most likely cause?
You configured an Auto Scaling group with MinSize=1, MaxSize=5, DesiredCapacity=3. After deployment, you notice it only runs 1 instance. What is the most likely cause?
medium📝 Debug Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze instance count vs configuration
DesiredCapacity is 3, so Auto Scaling should run 3 instances if possible.Step 2: Identify possible launch failures
If only 1 instance runs, likely the launch configuration has errors (e.g., invalid AMI) preventing more instances from launching.Final Answer:
Invalid launch configuration causes instance launch failures -> Option BQuick Check:
Launch config errors cause fewer instances [OK]
Quick Trick: Check launch config if instances fewer than DesiredCapacity [OK]
Common Mistakes:
- Assuming MinSize limits instances to 1
- Thinking DesiredCapacity is ignored
- Believing MaxSize prevents scaling down
Master "Auto Scaling" in AWS
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