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1<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>
2 <code class="email">&lt;<a class="email" href="mailto:samba@samba.org">samba@samba.org</a>&gt;</code><br>
3 </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#id386537">Features and Benefits</a></span></dt><dt><span class="sect1"><a href="msdfs.html#id386927">Common Errors</a></span></dt><dd><dl><dt><span class="sect2"><a href="msdfs.html#id386956">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="id386537"></a>Features and Benefits</h2></div></div></div><p>
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9 The distributed file system (DFS) provides a means of separating the logical
10 view of files and directories that users see from the actual physical locations
11 of these resources on the network. It allows for higher availability, smoother
12 storage expansion, load balancing, and so on.
13 </p><p>
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17 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
18 documentation</a>. This document explains how to host a DFS tree on a UNIX machine (for DFS-aware clients
19 to browse) using Samba.
20 </p><p>
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25 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>
26 parameter in the <code class="filename">smb.conf</code> file. You designate a share as a DFS root using the share-level Boolean
27 <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
28 symbolic links that point to other servers. For example, a symbolic link
29 <code class="filename">junction-&gt;msdfs:storage1\share1</code> in the share directory acts as the DFS junction. When
30 DFS-aware clients attempt to access the junction link, they are redirected to the storage location (in this
31 case, <em class="parameter"><code>\\storage1\share1</code></em>).
32 </p><p>
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37 DFS trees on Samba work with all DFS-aware clients ranging from Windows 95 to 200x.
38 <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.
39 In the <code class="filename">/export/dfsroot</code> directory, you set up your DFS links to
40 other servers on the network.
41</p><pre class="screen">
42<code class="prompt">root# </code><strong class="userinput"><code>cd /export/dfsroot</code></strong>
43<code class="prompt">root# </code><strong class="userinput"><code>chown root /export/dfsroot</code></strong>
44<code class="prompt">root# </code><strong class="userinput"><code>chmod 755 /export/dfsroot</code></strong>
45<code class="prompt">root# </code><strong class="userinput"><code>ln -s msdfs:storageA\\shareA linka</code></strong>
46<code class="prompt">root# </code><strong class="userinput"><code>ln -s msdfs:serverB\\share,serverC\\share linkb</code></strong>
47</pre><p>
48</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="id386820"></a><em class="parameter"><code>netbios name = GANDALF</code></em></td></tr><tr><td><a class="indexterm" name="id386832"></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="id386852"></a><em class="parameter"><code>path = /export/dfsroot</code></em></td></tr><tr><td><a class="indexterm" name="id386864"></a><em class="parameter"><code>msdfs root = yes</code></em></td></tr></table></div></div><br class="example-break"><p>
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52 You should set up the permissions and ownership of the directory acting as the DFS root so that only
53 designated users can create, delete, or modify the msdfs links. Also note that symlink names should be all
54 lowercase. This limitation exists to have Samba avoid trying all the case combinations to get at the link
55 name. Finally, set up the symbolic links to point to the network shares you want and start Samba.
56 </p><p>
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59 Users on DFS-aware clients can now browse the DFS tree on the Samba server at
60 <code class="constant">\\samba\dfs</code>. Accessing links linka or linkb (which appear as directories to the client)
61 takes users directly to the appropriate shares on the network.
62 </p></div><div class="sect1" title="Common Errors"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id386927"></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
63 if a previously mounted non-DFS share is made a DFS
64 root, or vice versa. A better way is to introduce a
65 new share and make it the DFS root.</p></li><li class="listitem"><p>Currently, there's a restriction that msdfs
66 symlink names should all be lowercase.</p></li><li class="listitem"><p>For security purposes, the directory
67 acting as the root of the DFS tree should have ownership
68 and permissions set so only designated users can
69 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="id386956"></a>MSDFS UNIX Path Is Case-Critical</h3></div></div></div><p>
70 A network administrator sent advice to the Samba mailing list
71 after long sessions trying to determine why DFS was not working.
72 His advice is worth noting.
73 </p><p><span class="quote">&#8220;<span class="quote">
74 I spent some time trying to figure out why my particular
75 DFS root wasn't working. I noted in the documentation that
76 the symlink should be in all lowercase. It should be
77 amended that the entire path to the symlink should all be
78 in lowercase as well.
79 </span>&#8221;</span></p><p>
80 <span class="quote">&#8220;<span class="quote">For example, I had a share defined as such:</span>&#8221;</span>
81 </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="id386993"></a><em class="parameter"><code>path = /export/home/Shares/public_share</code></em></td></tr><tr><td><a class="indexterm" name="id387005"></a><em class="parameter"><code>msdfs root = yes</code></em></td></tr></table><p>
82 <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>
83 </p><pre class="screen">
84 damage1 -&gt; msdfs:damage\test-share
85 </pre><p>
86 </p><p>
87 <span class="quote">&#8220;<span class="quote">Running a debug level of 10 reveals:</span>&#8221;</span>
88 </p><pre class="programlisting">
89 [2003/08/20 11:40:33, 5] msdfs/msdfs.c:is_msdfs_link(176)
90 is_msdfs_link: /export/home/shares/public_share/* does not exist.
91 </pre><p>
92 <span class="quote">&#8220;<span class="quote">Curious. So I changed the directory name from <code class="constant">.../Shares/...</code> to
93 <code class="constant">.../shares/...</code> (along with my service definition) and it worked!</span>&#8221;</span>
94 </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>
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