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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148
8- 4
Immutableの効用
変更不可（Immutable）IaC
変更可能なIaCとは、インフラ変更を行う際に既存のリソースを変更・
更新するアプローチです。リソースの設定を手動で変更して更新するた
め、同じ環境でインフラとしてのバージョン管理が必要になります。
それに対し、変更不可なIaCとは、インフラ変更を行う際に、新しい
リソースを構築し、既存のリソースを削除するアプローチです。このアプ
ローチは一貫性を保ち、変更の影響を最小限に抑え、環境のバージョン管
理も不要になります（図8-8）。
Log4j（Application Programming Interface）というオープンソースのロ
ギングAPIが世界中の Java アプリケーションで広く利用されています。し
かし、2021 年 12 月に Log4jの重大な脆弱性が見つかり、大人気ゲーム
「Minecraft」や Apple 社の「iCloud」など、一般に身近なサービスへの影響
も確認されました（図8-9）。
Log4jの脆弱性に対処するためのパッチ適用について、パッチの提供タ
イミング、インフラの複雑さやアプリケーションの依存関係、テストと検
証などの要因によって異なる時間がかかります。
既存リソースを調査してパッチ適用するのはあまりにも時間がかかるた
め、新しいバージョンのアプリケーションイメージをビルドしてコンテナ
化するか、仮想マシンイメージを更新し、この新しいイメージには対策済
みのLog4j を入れる方が効率的です。 ...
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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.
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.