April 2016
Intermediate to advanced
364 pages
7h 54m
Japanese
Content preview from 初めてのAnsible
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256
13 章 Docker
Docker
は、単なるコンテナ以上のものです。
Docker
は、コンテナをビルディングブロックと
するプラットフォームと考えてください。例えるなら、
Docker
にとってのコンテナは、
IaaS
クラ
ウドに取っての仮想マシンのようなものです。
Docker
を構成するもう
2
つの大きなピースは、そ
のイメージフォーマットと
Docker API
です。
Docker
のイメージは、仮想マシンのイメージと同じようなものと考えることができます。
Docker
のイメージには、多少のメタデータと共に、オペレーティングシステムがインストールさ
れたファイルシステムが含まれます。重要な違いの
1
つとして、
Docker
のイメージはレイヤー化
されています。新しい
Docker
のイメージは、既存の
Docker
のイメージに対して、ファイルの追
加や変更、削除を行うことによって作成します。新しい
Docker
イメージの表現には、オリジナ
ルの
Docker
のイメージとと共に、オリジナルと新しいイメージとのファイルシステムの差分が
含まれます。例えば、公式の
nginx
の
Docker
イメージ（
https://github.com/nginxinc/docker-
nginx/tree/master/stable
）は、様々な
os
のイメージ上のレイヤーとして構築されています。レ
イヤーを使うアプローチを取っていることで、
Docker
のイメージは通常の仮想マシンのイメージ
よりも小さくなっているので、インターネット経由で転送する場合に ...
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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.