April 2016
Intermediate to advanced
364 pages
7h 54m
Japanese
Content preview from 初めてのAnsible
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177
9.1 SSH マルチプレキシングと ControlPersist
ps 4388
とすれば、コントロールマスタープロセスが以下のように表示されるでしょう。
PID TT STAT TIME COMMAND
4388 ?? Ss 0:00.00 ssh: /tmp/ubuntu@myserver.example.com:22 [mux]
また、
-O exit
フラグを使えば、以下のようにマスター接続を終了させることもできます。
$ ssh -O exit ubuntu@myserver.example.com
これらの設定については、
ssh_config
の
man
ページに詳しい情報があります。
筆者は、
SSH
の接続の速度を以下のようにテストしてみました。
$ time ssh ubuntu@myserver.example.com /bin/true
こうすると、サーバーへの
SSH
接続を行い、
/bin/true
を実行するのにかかった時間が計測さ
れます。
/bin/true
は、リターンコード
0
で終了するだけの単純なプログラムです。
初回の実行時には、このコマンドの出力の時間計測の部分は、以下のようになりました
†
。
0.01s user 0.01s system 2% cpu 0.913 total
本当に重要なのは、トータルの時間である
0.913 total
の部分です。これは、このコマンド全体
の実行に
0.913
秒かかったということを示しています（トータルの時間は、ウオールクロック時間
と呼ばれることもあります。これは、壁がけ時計で時間を計っている場合にかかった時間だからで ...
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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.