August 2016
Intermediate to advanced
384 pages
9h 20m
Japanese
Content preview from Docker
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330
13 章 セキュリティとコンテナに対する制限
13.7.9
リソース制限の適用（
ulimit
）
Linux
のカーネルは、フォークできる子プロセス数の制限や、オープンできるファイルディスク
リプタ数など、プロセスに対して適用できるリソース制限を定義しています。これらは、
--uliit
フラグを
docker run
に渡すか、
Docker
デーモンの起動時に、コンテナ全体に対するデフォルト
を
--default-ulimit
に渡すことによって、
Docker
コンテナに対しても適用できます。この引数
は、コロンで区切られたソフトリミットとハードリミットという
2
つの値を取ります。この引数
の効果は、それぞれの値に応じて決まります。指定された値が
1
つだけなら、それはソフトリミッ
トとしても、ハードリミットとしても使われます。
指定できる値とその意味の完全な説明は、
man setrlimit
にあります（ただし、
as
による制限
はコンテナでは使えません）。特に注目しておくべきなのは、以下の値です。
cpu
使用できる
CPU
時間を、指定された秒数に制限します。ソフトリミット（この秒数に達する
と、コンテナには
SIGXCPU
が送られます）と、ハードリミット（
SIGKILL
が送られます）を取
ります。例として、「メモリの制限」や「
CPU
」の制限で使った
stress
ユーティリティをここ
でも使って、
CPU
を最大限に使いましょう。
$ time docker run --ulimit cpu=12:14 amouat/stress ...
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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.