でも、そのためだけにVPSにdockerとかコンテナを入れて使うってのは、構築も運用もめんどくさいし、ディスク容量食うし、やりたくない。systemd-nspawnも割と重たい雰囲気だし、LTSなubuntuだとそもそもsystemd入ってないし…
俺たちがほしいのは、ホストの環境の一部のみにアクセスできる、手軽なjailだー! ってわけで、ざっくり書いたのが、jailing。
/usr/bin等、OS由来のディレクトリをchroot環境にread-onlyでエクスポートしつつ、指定されたコマンドを、そのchroot環境で動かすスクリプトです。
/usr/localや/homeといったディレクトリはエクスポートしないので、chroot環境下のソフトウェアにセキュリティホールがあって侵入されたとしても、(カーネルにバグがなければ)chroot環境外の情報が漏洩することはありません。
ホストとchroot環境でディレクトリを共有するためには、--bindオプションを使います。
たとえば、/usr/local/apache下にインストールしたApacheをchroot環境下で動かしたいなって時、jailingを使えば、以下のようにコマンド一発でchroot環境を作成して実行できます。
% sudo jailing --root=/var/httpd-jail \ --bind /usr/local/apache \ -- \ /usr/local/apache/bin/httpd \ -c /usr/local/apache/conf/httpd.confあるいは、/usr/local/h2o下にインストールしたH2Oをchroot環境下で動かす場合は、こんな感じ。
% sudo jailing --root /var/h2o-jail \ --bind /usr/local/h2o \ -- \ /usr/local/h2o/bin/h2o \ -m daemon \ -c /usr/local/h2o/etc/h2o.confあるいは、jail内に入るには、
% sudo jailing --root /var/h2o-jail \ -- \ bashとかやればいいわけです。
簡単ですね!
詳しくは
man jailing
したりしてください。それでは〜
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