May 2024
Intermediate
248 pages
6h 59m
Japanese
Content preview from 図解まるわかり 仮想化のしくみ
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Lambdaは処理の時間だけ関数を起動する AWSのサーバーレスコンピ
ューティングサービスです。OSなどのインフラストラクチャーの管理は
AWSが対応しているため、利用者は関数コードを登録するだけで実行で
きます。関数処理時間だけ課金されるため、インフラストラクチャーの運
用コストを削減できます（図9-13）。
Lambdaは Java、Ruby、Python、Node.js、.NET、Go などのランタイムを
サポートし、外部ライブラリを共有できる機能を備えているイベント駆動
型の関数実行サービスです。イベントを実行するためには、トリガーを設
定する必要があります。トリガーは同期と非同期呼び出しの2 種類があり
ます。APIゲートウェイや手動実行が同期呼び出しトリガーに該当しま
す。1 回実行の同期呼び出しとは違い、非同期呼び出しではLambda側か
ら定期的にポーリングして、イベントが発生するたびに処理が実行されま
す。S3をトリガーとした非同期呼び出しの例を図9-14に記載しています。
Lambda関数が他の AWSサービスを操作できるようにするために、適切
な権限（必要最小限の権限）のある IAMロールをLambda 関数に関連づけ
る必要があります。
Lambdaの利用には制限があります。1回の実行につき15 分までという
起動時間の制限があり、長時間の処理は実行を分割するなどの設計が必要
です。また、関数の呼び出し回数が同一アカウントの同一リージョン内で
1,000 までという同時実行数の制限 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.