I have a small site which runs PostgreSQL, Nginx, and PHP. I'm looking
into running nginx inside a jailed host on my server for security
reasons (eg, if there is a hole in a php script).

The website root is actually a working copy of my subversion
repository. I have svnserve running through OpenVPN. My plan would be
to have svnserve and OpenVPN running on the "main" system, and
nginx/php running inside a jail.

I was wondering if it would be somehow possible to run a command on
the main system that updates the svn working copy inside the jail for
nginx to serve. Would I need to do the "svn up" over tcp/ip from the
jail to the main system? Or can I somehow update it via
file://path/to/main/repo?  I've never used or setup a jail before, so
how everything works is a bit confusing to me. Right now, I use an svn
post-commit hook to update the www working copy.

Also, how memory-intensive is a jail? I'm willing to run postgresql in
another jail as well if it wouldn't be too memory-intensive.  And
possibly even an IRC server.

I'm running FreeBSD 7.2-RELEASE-p3.

Thank you for the suggestions, advise, and criticisms.
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