Date: Sat, 11 Jun 2005 21:05:37 +0930 From: Rob <rob@deathbeforedecaf.net> To: freebsd-questions@freebsd.org Subject: Jails and filesystems Message-ID: <bf0cb71c4d68e703938b2c0c986c196d@deathbeforedecaf.net>
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Fellow BSDers, I'm trying to figure out the best layout for multiple jails. I'd like to share binaries across jails - patches and packages only need to be installed once, and it saves a lot of space. So these directories would be shared and read-only: /bin /sbin /usr (except /usr/local/etc) /var/db/pkg And these would be private: /etc /usr/local/etc /var (except /var/db/pkg) The current plan is to move all the shared stuff into /shared, and mount it read-only into each jail with nullfs. Then /usr/local/etc is moved into /private. This is how it looks inside the jail: > root@tak /tmp/3569/root # env - /usr/sbin/chroot `pwd` /usr/bin/login > -f root > Last login: Sat Jun 11 09:16:11 on tty?? > Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994 > The Regents of the University of California. All rights > reserved. > > root@tak ~ # cd / > root@tak / # ll > total 27 > drwxr-xr-x 13 root wheel 512 Jun 9 14:38 . > drwxr-xr-x 13 root wheel 512 Jun 9 14:38 .. > -rw-r--r-- 1 root wheel 802 Jan 21 15:46 .cshrc > -rw-r--r-- 1 root wheel 251 Jan 21 15:46 .profile > -r--r--r-- 1 root wheel 6117 Jan 21 15:46 COPYRIGHT > lrwxr-xr-x 1 root wheel 11 Jun 9 14:38 bin -> /shared/bin > drwxr-xr-x 3 root wheel 512 Jan 21 15:46 boot > drwxr-xr-x 3 root wheel 1536 Jun 9 14:01 dev > drwxr-xr-x 16 root wheel 2048 Jun 9 14:27 etc > -rw-r--r-- 1 root wheel 0 Jun 9 14:01 kernel > drwxr-xr-x 2 root wheel 512 Jun 9 14:37 mnt > drwxr-xr-x 2 root wheel 4608 Jun 9 14:01 modules > drwxr-xr-x 3 root wheel 512 Jun 9 14:37 private > dr-xr-xr-x 2 root wheel 512 Jan 21 15:45 proc > drwxr-xr-x 2 root wheel 512 Jun 11 09:12 root > lrwxr-xr-x 1 root wheel 12 Jun 9 14:38 sbin -> /shared/sbin > drwxr-xr-x 6 root wheel 512 Jun 9 14:47 shared > drwxrwxrwt 2 root wheel 512 Jan 21 15:45 tmp > lrwxr-xr-x 1 root wheel 11 Jun 9 14:38 usr -> /shared/usr > drwxr-xr-x 20 root wheel 512 Jun 9 14:01 var > root@tak / # ll usr/local var/db > usr/local: > total 2 > drwxr-xr-x 2 root wheel 512 Jun 9 14:38 . > drwxr-xr-x 14 root wheel 512 Jun 9 14:26 .. > lrwxr-xr-x 1 root wheel 12 Jun 9 14:38 etc -> /private/etc > > var/db: > total 3 > drwxr-xr-x 3 root wheel 512 Jun 9 14:47 . > drwxr-xr-x 20 root wheel 512 Jun 9 14:01 .. > drwx------ 2 root wheel 512 Jan 21 15:45 ipf > -rw-r--r-- 1 nobody wheel 0 Jan 21 15:46 locate.database > -rw-r--r-- 1 root wheel 0 Jun 9 14:01 mountdtab > lrwxr-xr-x 1 root wheel 11 Jun 9 14:47 pkg -> /shared/pkg > root@tak / # ll shared private > private: > total 3 > drwxr-xr-x 3 root wheel 512 Jun 9 14:37 . > drwxr-xr-x 13 root wheel 512 Jun 9 14:38 .. > drwxr-xr-x 2 root wheel 512 Jun 9 14:27 etc > > shared: > total 7 > drwxr-xr-x 6 root wheel 512 Jun 9 14:47 . > drwxr-xr-x 13 root wheel 512 Jun 9 14:38 .. > drwxr-xr-x 2 root wheel 1024 Jun 9 14:26 bin > drwxr-xr-x 2 root wheel 512 Jun 9 14:47 pkg > drwxr-xr-x 2 root wheel 2048 Jun 9 14:26 sbin > drwxr-xr-x 14 root wheel 512 Jun 9 14:26 usr I think this will work, but it seems kind of messy. Am I missing a simpler way? Thanks Rob.
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