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<TITLE>The Answer Guy 42: Loopback (localhost) NFS Mounting for FTP</TITLE>
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<H4>"The Linux Gazette...<I>making Linux just a little more fun!</I>"</H4>
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<H1><A NAME="answer">
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<font color="#B03060">The Answer Guy</font>
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<H4>By James T. Dennis,
<a href="mailto:linux-questions-only@ssc.com">linux-questions-only@ssc.com</a><BR>
LinuxCare,
<A HREF="http://www.linuxcare.com/">http://www.linuxcare.com/</A>
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
height="50" width="60" alt="(?) " border="0"
>Loopback (localhost) NFS Mounting for FTP</H3>
<p><strong>From Mark S. Turczan on Sun, 02 May 1999
</strong></p>
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Loopback (localhost) NFS Mounting for FTP
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<P><STRONG><IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
James,
</STRONG></P>
<P><STRONG>
Would you know of a way to setup a loopback mount within a <TT>/home/ftp</TT>
hierarchy?
</STRONG></P>
<P><STRONG>
Or could you provide a better method to achieve the following?
</STRONG></P>
<P><STRONG>
I've got a set of disks setup under software raid, and I've mounted them
under <TT>/mnt/raid.</TT> What I'd like to do is include a link from a directory
under <TT>/home/pub/Archive</TT> to the actual files under <TT>/mnt/raid/Archive.</TT>
I've tried doing this with a symbolic link, but it doesn't seem to
resolve it when I connect through ftp.
</STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
When you connect as "anonymous" or "ftp" through the
conventionally configure FTP service, or as any member of
a "guestgroup" to a WU-FTP daemon, you are in a chroot
jail. This is intended to prevent you (an FTP client)
from wandering around the filesystem peeking into things
where you don't belong (as an anonymous or guest user).
</BLOCKQUOTE>
<BLOCKQUOTE>
Naturally symbolic links don't pierce through a chroot
wall.
</BLOCKQUOTE>
<BLOCKQUOTE>
It's possible to configure your system to act as an
NFS server and client (concurrrently) and to export a
directory tree (presumably in read-only mode) to yourself.
</BLOCKQUOTE>
<BLOCKQUOTE>
This is one of several tricks that is referred to as a
"loopback mount" (not to be confused with the
<tt>mount -o loop=</tt>... option which is a way of mounting a
file image as a filesystem). In this case you're doing
a perfectly normal NFS export, and a perfectly normal
NFS mount. The only oddity is that the export and mount
are on the same machine and are going through the loopback
network interface.
</BLOCKQUOTE>
<BLOCKQUOTE>
So you put a line in your <TT>/etc/exports</TT> file like:
</BLOCKQUOTE>
<BLOCKQUOTE><BlockQuote><Code>
<TT>/mnt/raid/ftparea</TT> 127.0.0.1(ro,insecure)
</Code></BlockQuote></BLOCKQUOTE>
<BLOCKQUOTE>
... and possibly some lines like:
</BLOCKQUOTE>
<BLOCKQUOTE><BlockQuote><Code>
<TT>/mnt/raid/ftparea/no/</TT> (noaccess)
</Code></BlockQuote></BLOCKQUOTE>
<BLOCKQUOTE>
(to define a set of subdirectories under the
exported directory tree to which you want to deny
access).
</BLOCKQUOTE>
<BLOCKQUOTE>
... and then you use a command like:
</BLOCKQUOTE>
<BLOCKQUOTE><BLOCKQUOTE><CODE><BlockQuote>
mount -t nfs 127.0.0.1:/mnt/raid/ftparea <TT>/home/ftp/home</TT>
</BlockQuote></CODE></BLOCKQUOTE></BLOCKQUOTE>
<BLOCKQUOTE>
... or whatever.
</BLOCKQUOTE>
<BLOCKQUOTE>
Personally I think it's horrible kludge. But I've
done things sort of like this and it does work.
</BLOCKQUOTE>
<P><STRONG><IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Thanks for any help you can offer.
<br>--
<br>Mark Turczan
</STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Hope that makes sense.
</BLOCKQUOTE>
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<H5 align="center"><a href="http://www.linuxgazette.com/copying.html"
>Copyright &copy;</a> 1999, James T. Dennis
<BR>Published in <I>The Linux Gazette</I> Issue 42 June 1999</H5>
<H6 ALIGN="center">HTML transformation by
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