AWSは従量課金制の料金モデルを採用しており、使用したリソースに対してのみ料金を支払い、ほとんどのサービスで事前のコミットメントは不要です。料金モデル、一般的なコスト要因、コスト管理方法を理解することは実践的に重要な知識です(クラウドの請求額は予想外になることがあります)。
従量課金制モデル
Most AWS services charge based on USAGE, with no upfront cost:
→ COMPUTE — per second/hour an instance runs (EC2), or per request/duration (Lambda)
→ STORAGE — per GB stored per month (S3, EBS)
→ DATA TRANSFER — often charged for data OUT to the internet (a common surprise!)
→ REQUESTS/operations — per API call, per request (S3, DynamoDB, Lambda)
→ Pay for what you use; scale cost with usage.
無料利用枠(学習用)
AWS FREE TIER lets you try services free (great for learning):
→ ALWAYS FREE — some services have a perpetual free allowance (e.g. Lambda requests)
→ 12 MONTHS FREE — some free for a year for new accounts (e.g. 750 hrs/mo t2.micro EC2)
→ TRIALS — short-term free trials of some services
⚠️ Exceeding free-tier limits incurs charges — monitor usage!
