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If traffic suddenly spikes, which setting controls the maximum servers it can scale up to, and what should it be set to?

hard📝 Best Practice Q15 of 15
AWS - Auto Scaling
You want an Auto Scaling group to always run at least 2 servers, never more than 8, and normally keep 5 running. If traffic suddenly spikes, which setting controls the maximum servers it can scale up to, and what should it be set to?
AMaxSize controls maximum servers; set to 8
BDesiredCapacity controls maximum servers; set to 8
CMinSize controls maximum servers; set to 5
DDesiredCapacity controls maximum servers; set to 2
Step-by-Step Solution
Solution:
  1. Step 1: Identify which setting limits maximum servers

    MaxSize sets the upper limit of servers allowed in the group.
  2. Step 2: Match requirement to setting

    To never exceed 8 servers, MaxSize must be set to 8.
  3. Step 3: Understand DesiredCapacity and MinSize roles

    DesiredCapacity is the target number (5), MinSize is the minimum (2), neither limits maximum scaling.
  4. Final Answer:

    MaxSize controls maximum servers; set to 8 -> Option A
  5. Quick Check:

    MaxSize = max servers allowed [OK]
Quick Trick: MaxSize limits max servers; DesiredCapacity is target [OK]
Common Mistakes:
  • Confusing DesiredCapacity with MaxSize
  • Setting MinSize as maximum limit
  • Not setting MaxSize high enough for spikes

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