April 2016
Intermediate to advanced
364 pages
7h 54m
Japanese
Content preview from 初めてのAnsible
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255
13
章
Docker
Docker
プロジェクトは、
IT
の世界を席巻しました。これほど急速にコミュニティによって受
け入れられた技術を筆者は知りません。本章では、
Ansible
を使った
Docker
イメージの作成と、
Docker
コンテナのデプロイの方法を取り上げます。
コンテナとは何か？
コンテナは、仮想化の 1 つの形です。仮想化を利用してゲストのオペレーティングシステム内でプロセ
スを実行する場合、それらのゲストのプロセスからは、物理的なハードウェア上で動作しているホストオペ
レーティングシステムを見ることはできません。特に、ゲスト内で動作しているプロセスは、一見ルートア
クセス権を持っているように見えても、実際には物理リソースに直接アクセスすることはできません。
コンテナは、技術と区別するために、技術と呼
ばれることもあります。
ハードウェアの仮想化の場合、と呼ばれるプログラムが物理マシン全体を仮想化し、
そのマシンには仮想化された CPU、メモリ、そしてディスクやネットワークインターフェースといったデ
バイスが含まれます。マシン全体が仮想化されているので、ハードウェアの仮想化は非常に柔軟です。特
に、ホストとまったく異なるオペレーティングシステムを実行することが可能であり（例えば、Redhat
Enterprise Linux のホスト上で Windows Server 2012 のゲストを実行できます）、仮想マシンを物理
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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.
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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.