AWS - EC2 Fundamentals
You want to optimize costs by combining Reserved and Spot Instances for a web application. Which approach is best?
You want to optimize costs by combining Reserved and Spot Instances for a web application. Which approach is best?
hard📝 Best Practice Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand workload pattern
Web app has steady baseline and variable extra traffic.Step 2: Match pricing models to workload
Reserved Instances cover steady baseline at low cost; Spot Instances handle variable load cheaply but with interruptions.Step 3: Evaluate other options
Spot only risks interruptions; Reserved only misses cost savings; On-Demand for baseline is costlier.Final Answer:
Use Reserved Instances for steady baseline and Spot for extra capacity -> Option CQuick Check:
Combine Reserved baseline + Spot extra = cost optimized [OK]
Quick Trick: Baseline on Reserved, spikes on Spot saves money [OK]
Common Mistakes:
- Using Spot only risking downtime
- Ignoring cost benefits of Reserved
- Confusing On-Demand role
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