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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230
12-5でブラウザ外で動作するWasmについての話をしましたが、ここ
では特に仮想サーバーやコンテナとの違いに注目してみます。
サーバー仮想化は仮想ハードウェアの構成定義によってハードウェアを
仮想化することで、アプリケーションは別々の仮想サーバーで動作しま
す。仮想ハードウェア単位で分離するため、アプリケーションからもOS
からも個別のハードウェアがあるように見えます。コンテナはコンテナエ
ンジンによるプロセス分離によりアプリケーションの実行空間（プロセ
ス）を分離しながらカーネルを共通的に使います。アプリケーションから
はコンテナという個別のアプリ実行場所があるように見えます。
Wasmは、Wasm ランタイムによりアプリケーションをサンドボックス
の単位で分離します。Wasmアプリはサンドボックスという個別のアプリ
実行場所があるように見えます。OSが管理するリソースへは WASI を使
用してアクセスします。
WASIは Wasm ランタイム用の APIを定義して、Wasm がホストの外部の
環境およびリソースにアクセスできるようにするもので、Wasmtimeや
Wasmerといった Wasm ランタイムで実装されています。
WASIの重要な点の1 つ目はポータビリティです。各種OSにWASIを配
置してWASIのインタフェースが統一されることで、Wasmバイナリ形式
にコンパイルしさえすればWASIが実行できるあらゆる環境でアプリケー
ションが実行できます（図12-17）。
重要な点の2
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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.