April 2016
Intermediate to advanced
364 pages
7h 54m
Japanese
Content preview from 初めてのAnsible
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175
9
章
Ansible
の高速化
本章では、
Ansible
による
playbook
の実行時間を短縮する方法について議論します。
9.1
SSH
マルチプレキシングと
ControlPersist
ここまで本書を読んで来ていれば、サーバーとの主要な通信の仕組みとして、
Ansible
が
SSH
を使っていることはおわかりでしょう。特に、デフォルトでは
Ansible
はシステムの
SSH
プログ
ラムを使います。
SSH
プロトコルは
TCP
プロトコルの上で動作するので、リモートマシンに
SSH
で接続する場
合は、新たな
TCP
接続を行う必要があります。クライアントとサーバーは、実際に有益な作業を
始める前に、この接続のネゴシエーションをしなければなりません。このネゴシエーションには、
わずかながら時間がかかります。
Ansible
が
playbook
を実行する際には、ファイルのコピーやコマンドの実行といったことを行
うために、多くの
SSH
接続を行うことになります。
Ansible
がホストに
SSH
で接続を行うたび
に、ネゴシエーションの時間がかかります。
OpenSSH
は、もっとも一般的な
SSH
の実装であり、ローカルマシンで
Linux
あるいは
Mac
OS X
を使っているのであれば、まず間違いなく
OpenSSH
のクライアントがインストールされて
いるはずです。
OpenSSH
は、
SSH
マルチプレキシング、あるいは
ControlPeersist
と呼ばれる最
適化の仕組みをサポートしています。
SSH
マルチプレキシングを使う場合、同一ホストへの複数 ...
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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.