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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter�20.�Hosting a Microsoft Distributed File System Tree</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"><link rel="home" href="index.html" title="The Official Samba 3.5.x HOWTO and Reference Guide"><link rel="up" href="optional.html" title="Part�III.�Advanced Configuration"><link rel="prev" href="InterdomainTrusts.html" title="Chapter�19.�Interdomain Trust Relationships"><link rel="next" href="classicalprinting.html" title="Chapter�21.�Classical Printing Support"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter�20.�Hosting a Microsoft Distributed File System Tree</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="InterdomainTrusts.html">Prev</a>�</td><th width="60%" align="center">Part�III.�Advanced Configuration</th><td width="20%" align="right">�<a accesskey="n" href="classicalprinting.html">Next</a></td></tr></table><hr></div><div class="chapter" title="Chapter�20.�Hosting a Microsoft Distributed File System Tree"><div class="titlepage"><div><div><h2 class="title"><a name="msdfs"></a>Chapter�20.�Hosting a Microsoft Distributed File System Tree</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Shirish</span> <span class="surname">Kalele</span></h3><div class="affiliation"><span class="orgname">Samba Team &amp; Veritas Software<br></span><div class="address"><p><br>
				<code class="email">&lt;<a class="email" href="mailto:samba@samba.org">samba@samba.org</a>&gt;</code><br>
			</p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">John</span> <span class="othername">H.</span> <span class="surname">Terpstra</span></h3><div class="affiliation"><span class="orgname">Samba Team<br></span><div class="address"><p><code class="email">&lt;<a class="email" href="mailto:jht@samba.org">jht@samba.org</a>&gt;</code></p></div></div></div></div><div><p class="pubdate">12 Jul 2000</p></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="msdfs.html#id388393">Features and Benefits</a></span></dt><dt><span class="sect1"><a href="msdfs.html#id388783">Common Errors</a></span></dt><dd><dl><dt><span class="sect2"><a href="msdfs.html#id388812">MSDFS UNIX Path Is Case-Critical</a></span></dt></dl></dd></dl></div><div class="sect1" title="Features and Benefits"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id388393"></a>Features and Benefits</h2></div></div></div><p>
<a class="indexterm" name="id388401"></a>
<a class="indexterm" name="id388410"></a>
<a class="indexterm" name="id388417"></a>
<a class="indexterm" name="id388424"></a>
<a class="indexterm" name="id388430"></a>
	The distributed file system (DFS) provides a means of separating the logical
	view of files and directories that users see from the actual physical locations
	of these resources on the network. It allows for higher availability, smoother
	storage expansion, load balancing, and so on.
	</p><p>
<a class="indexterm" name="id388443"></a>
<a class="indexterm" name="id388450"></a>
<a class="indexterm" name="id388456"></a>
	For information about DFS, refer to the <a class="ulink" href="http://www.microsoft.com/NTServer/nts/downloads/winfeatures/NTSDistrFile/AdminGuide.asp" target="_top">Microsoft
	documentation</a>.  This document explains how to host a DFS tree on a UNIX machine (for DFS-aware clients
	to browse) using Samba.
	</p><p>
<a class="indexterm" name="id388474"></a>
<a class="indexterm" name="id388481"></a>
<a class="indexterm" name="id388488"></a>
<a class="indexterm" name="id388495"></a>
	A Samba server can be made a DFS server by setting the global Boolean <a class="link" href="smb.conf.5.html#HOSTMSDFS" target="_top">host msdfs</a>
	parameter in the <code class="filename">smb.conf</code> file. You designate a share as a DFS root using the share-level Boolean
	<a class="link" href="smb.conf.5.html#MSDFSROOT" target="_top">msdfs root</a> parameter. A DFS root directory on Samba hosts DFS links in the form of
	symbolic links that point to other servers. For example, a symbolic link
	<code class="filename">junction-&gt;msdfs:storage1\share1</code> in the share directory acts as the DFS junction. When
	DFS-aware clients attempt to access the junction link, they are redirected to the storage location (in this
	case, <em class="parameter"><code>\\storage1\share1</code></em>).
	</p><p>
<a class="indexterm" name="id388551"></a>
<a class="indexterm" name="id388558"></a>
<a class="indexterm" name="id388564"></a>
<a class="indexterm" name="id388571"></a>
	DFS trees on Samba work with all DFS-aware clients ranging from Windows 95 to 200x.
	<a class="link" href="msdfs.html#dfscfg" title="Example�20.1.�smb.conf with DFS Configured">The following sample configuration</a> shows how to setup a DFS tree on a Samba server.
	In the <code class="filename">/export/dfsroot</code> directory, you set up your DFS links to 
	other servers on the network.
</p><pre class="screen">
<code class="prompt">root# </code><strong class="userinput"><code>cd /export/dfsroot</code></strong>
<code class="prompt">root# </code><strong class="userinput"><code>chown root /export/dfsroot</code></strong>
<code class="prompt">root# </code><strong class="userinput"><code>chmod 755 /export/dfsroot</code></strong>
<code class="prompt">root# </code><strong class="userinput"><code>ln -s msdfs:storageA\\shareA linka</code></strong>
<code class="prompt">root# </code><strong class="userinput"><code>ln -s msdfs:serverB\\share,serverC\\share linkb</code></strong>
</pre><p>
</p><div class="example"><a name="dfscfg"></a><p class="title"><b>Example�20.1.�smb.conf with DFS Configured</b></p><div class="example-contents"><table border="0" summary="Simple list" class="simplelist"><tr><td> </td></tr><tr><td><em class="parameter"><code>[global]</code></em></td></tr><tr><td><a class="indexterm" name="id388676"></a><em class="parameter"><code>netbios name = GANDALF</code></em></td></tr><tr><td><a class="indexterm" name="id388688"></a><em class="parameter"><code>host msdfs   = yes</code></em></td></tr><tr><td> </td></tr><tr><td><em class="parameter"><code>[dfs]</code></em></td></tr><tr><td><a class="indexterm" name="id388708"></a><em class="parameter"><code>path = /export/dfsroot</code></em></td></tr><tr><td><a class="indexterm" name="id388720"></a><em class="parameter"><code>msdfs root = yes</code></em></td></tr></table></div></div><br class="example-break"><p>
<a class="indexterm" name="id388734"></a>
<a class="indexterm" name="id388741"></a>
<a class="indexterm" name="id388748"></a>
	You should set up the permissions and ownership of the directory acting as the DFS root so that only
	designated users can create, delete, or modify the msdfs links. Also note that symlink names should be all
	lowercase. This limitation exists to have Samba avoid trying all the case combinations to get at the link
	name. Finally, set up the symbolic links to point to the network shares you want and start Samba.
	</p><p>
<a class="indexterm" name="id388761"></a>
<a class="indexterm" name="id388768"></a>
	Users on DFS-aware clients can now browse the DFS tree on the Samba server at
	<code class="constant">\\samba\dfs</code>. Accessing links linka or linkb (which appear as directories to the client)
	takes users directly to the appropriate shares on the network.
	</p></div><div class="sect1" title="Common Errors"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id388783"></a>Common Errors</h2></div></div></div><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>Windows clients need to be rebooted 
		if a previously mounted non-DFS share is made a DFS 
		root, or vice versa. A better way is to introduce a 
		new share and make it the DFS root.</p></li><li class="listitem"><p>Currently, there's a restriction that msdfs 
		symlink names should all be lowercase.</p></li><li class="listitem"><p>For security purposes, the directory 
		acting as the root of the DFS tree should have ownership 
		and permissions set so only designated users can 
		modify the symbolic links in the directory.</p></li></ul></div><div class="sect2" title="MSDFS UNIX Path Is Case-Critical"><div class="titlepage"><div><div><h3 class="title"><a name="id388812"></a>MSDFS UNIX Path Is Case-Critical</h3></div></div></div><p>
		A network administrator sent advice to the Samba mailing list
		after long sessions trying to determine why DFS was not working.
		His advice is worth noting.
		</p><p><span class="quote">&#8220;<span class="quote">
		I spent some time trying to figure out why my particular
		DFS root wasn't working. I noted in the documentation that
		the symlink should be in all lowercase. It should be
		amended that the entire path to the symlink should all be
		in lowercase as well.
		</span>&#8221;</span></p><p>
		<span class="quote">&#8220;<span class="quote">For example, I had a share defined as such:</span>&#8221;</span>
		</p><table border="0" summary="Simple list" class="simplelist"><tr><td> </td></tr><tr><td><em class="parameter"><code>[pub]</code></em></td></tr><tr><td><a class="indexterm" name="id388849"></a><em class="parameter"><code>path = /export/home/Shares/public_share</code></em></td></tr><tr><td><a class="indexterm" name="id388861"></a><em class="parameter"><code>msdfs root = yes</code></em></td></tr></table><p>
		<span class="quote">&#8220;<span class="quote">and I could not make my Windows 9x/Me (with the dfs client installed) follow this symlink:</span>&#8221;</span>
		</p><pre class="screen">
		damage1 -&gt; msdfs:damage\test-share
		</pre><p>
		</p><p>
		<span class="quote">&#8220;<span class="quote">Running a debug level of 10 reveals:</span>&#8221;</span>
		</p><pre class="programlisting">
		[2003/08/20 11:40:33, 5] msdfs/msdfs.c:is_msdfs_link(176)
		  is_msdfs_link: /export/home/shares/public_share/* does not exist.
		</pre><p>
		<span class="quote">&#8220;<span class="quote">Curious. So I changed the directory name from <code class="constant">.../Shares/...</code> to
		<code class="constant">.../shares/...</code> (along with my service definition) and it worked!</span>&#8221;</span>
		</p></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="InterdomainTrusts.html">Prev</a>�</td><td width="20%" align="center"><a accesskey="u" href="optional.html">Up</a></td><td width="40%" align="right">�<a accesskey="n" href="classicalprinting.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter�19.�Interdomain Trust Relationships�</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">�Chapter�21.�Classical Printing Support</td></tr></table></div></body></html>