Chad, Rob, -
On linux you can do a

% mount -bind olddir newdir

to remount a piece of the FS somewhere else.  The NullFS on FBSD seems
to allow similar things.  However, as much as I could find on NullFS


I'm currently setting up my 4.9-RELEASE webserver to do something similar - each jail gets a root filesystem, but /usr is shared readonly by all of them. The exception is /usr/local/etc, which is symlinked to /etc/local (in the jail).

My impression, though I don't have much to back this up with, is that
nullfs is reliable enough in read-only mode. Other folks may have a
different opinion.

Personally, I use (localhost) nfs-mounts to remount parts of the file system somewhere else. Works quite well.

Martin Brecher
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