From owner-freebsd-questions  Fri Dec  7 10:48:49 2001
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Date: Fri, 7 Dec 2001 19:49:17 +0100
From: Gabriel Ambuehl <gabriel_ambuehl@buz.ch>
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To: questions@freebsd.org
Subject: What happens on a system with LOTs of mount points (say >1500)?
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Hello,
I'm wondering how FreeBSD would behave if I did the following for eac
of about 400 directories (domains) per server:


cd /home/web/user_dom/
mkdir bin
mkdir sbin
mkdir etc
mkdir usr
mkdir temp
mount_null -o rdonly /bin bin
mount_null -o rdonly /sbin sbin
mount_null -o rdonly /etc etc
mount_null -o rdonly /usr usr

i.e. have about 1600 mount points on a single machine. The purpose of
the exercise is to create chroot() environments that get updated
automatically when the base system is updated...

#!/usr/bin/perl
$counter=0;
while($counter<500)
{

print counter;
 $counter++;
 system("mkdir $counter");
 system("mkdir $counter/usr");
 system("mkdir $counter/etc");
 system("mkdir $counter/bin");
 system("mkdir $counter/sbin");



 system("mount_null -o rdonly /usr $counter/usr");
 system("mount_null -o rdonly /sbin $counter/sbin");
 system("mount_null -o rdonly /bin $counter/bin");
 system("mount_null -o rdonly /etc $counter/etc");

  }

will happily create a test environment, afterwards
$ mount
of course looks pretty crowded, but what other things do I need to
consider? Has any one got any experience with this kind of stuff?




TIA & best regards,
 Gabriel
J

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