September 2025
Intermediate
544 pages
19h 22m
Japanese
Content preview from マルチクラウドセキュリティの教科書 クラウド横断で実現する堅牢なセキュリティ基盤
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Chapter 3 クラウドプラットフォームとインフラセキュリティ
234
• Open Policy Agent（OPA）
※50
OPAはCloud Native Computing Foundation（CNCF）がホストするオープンソースの汎用ポリシーエンジンで、
インフラ構成管理を含むさまざまなシステムでポリシーを一貫して適用できるように設計されています。ポリシーをコー
ドとして記述し、入力となる構成データに対して評価を行うことで、条件違反を検出したり許可、拒否の判断を下したり
できます。たとえば、
Terraform計画内容（terraform planコマンドの結果）を OPAに渡し、「許可されていないポー
トが開放されていないか」「タグ命名規則に従っているか」といったルールをチェックする用途で使われます。
OPA自体
は汎用エンジンなので、
KubernetesのAdmission Controller（Gatekeeper）によるリソース検証や、CIパイプライ
ン内での
IaCコードスキャンなど幅広い場面で Policy as Codeを実現できます。
• HashiCorp Sentinel
※51
HashiCorp SentinelはHashiCorp社が提供するポリシーコードフレームワークで、Terraform Enterprise / Cloud
に統合されています。Sentinelを使うとTerraformの実行（plan / apply）の過程で独自ポリシーによる検証を挟み、
違反があれば適用を停止するといったことが可能です。 ...
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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.
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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.