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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 17. Hosting a Microsoft Distributed File System tree on Samba</title><link rel="stylesheet" href="samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.60.1"><link rel="home" href="index.html" title="SAMBA Project Documentation"><link rel="up" href="optional.html" title="Part III. Advanced Configuration"><link rel="previous" href="InterdomainTrusts.html" title="Chapter 16. Interdomain Trust Relationships"><link rel="next" href="printing.html" title="Chapter 18. 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 17. Hosting a Microsoft Distributed File System tree on Samba</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="printing.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="msdfs"></a>Chapter 17. Hosting a Microsoft Distributed File System tree on Samba</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 & Veritas Software<br></span><div class="address"><p><br>
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<tt class="email"><<a href="mailto:samba@samba.org">samba@samba.org</a>></tt><br>
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</p></div></div></div></div><div><p class="pubdate">12 Jul 2000</p></div></div><div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><a href="msdfs.html#id2929286">Features and Benefits</a></dt><dt><a href="msdfs.html#id2930696">Common Errors</a></dt></dl></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2929286"></a>Features and Benefits</h2></div></div><div></div></div><p>
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The Distributed File System (or DFS) provides a means of separating the logical
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view of files and directories that users see from the actual physical locations
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of these resources on the network. It allows for higher availability, smoother
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storage expansion, load balancing etc.
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</p><p>
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For information about DFS, refer to
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<a href="http://www.microsoft.com/NTServer/nts/downloads/winfeatures/NTSDistrFile/AdminGuide.asp" target="_top">
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Microsoft documentation at http://www.microsoft.com/NTServer/nts/downloads/winfeatures/NTSDistrFile/AdminGuide.asp</a>.
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</p><p>
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This document explains how to host a DFS tree on a Unix machine (for DFS-aware
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clients to browse) using Samba.
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</p><p>
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To enable SMB-based DFS for Samba, configure it with the <i class="parameter"><tt>--with-msdfs</tt></i>
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option. Once built, a Samba server can be made a DFS server by setting the global
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boolean <a href="smb.conf.5.html#HOSTMSDFS" target="_top"><i class="parameter"><tt> host msdfs</tt></i></a>
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parameter in the <tt class="filename">smb.conf </tt> file. You designate a share as a DFS
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root using the share level boolean <a href="smb.conf.5.html#MSDFSROOT" target="_top"><i class="parameter"><tt>
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msdfs root</tt></i></a> parameter. A DFS root directory on Samba hosts DFS
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links in the form of symbolic links that point to other servers. For example, a symbolic link
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<tt class="filename">junction->msdfs:storage1\share1</tt> in the share directory acts
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as the DFS junction. When DFS-aware clients attempt to access the junction link,
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they are redirected to the storage location (in this case, \\storage1\share1).
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</p><p>
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DFS trees on Samba work with all DFS-aware clients ranging from Windows 95 to 200x.
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</p><p>
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Here's an example of setting up a DFS tree on a Samba server.
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</p><pre class="programlisting">
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# The smb.conf file:
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[global]
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netbios name = SMOKEY
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host msdfs = yes
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[dfs]
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path = /export/dfsroot
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msdfs root = yes
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</pre><p>In the /export/dfsroot directory we set up our dfs links to
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other servers on the network.</p><pre class="screen">
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<tt class="prompt">root# </tt><b class="userinput"><tt>cd /export/dfsroot</tt></b>
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<tt class="prompt">root# </tt><b class="userinput"><tt>chown root /export/dfsroot</tt></b>
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<tt class="prompt">root# </tt><b class="userinput"><tt>chmod 755 /export/dfsroot</tt></b>
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<tt class="prompt">root# </tt><b class="userinput"><tt>ln -s msdfs:storageA\\shareA linka</tt></b>
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<tt class="prompt">root# </tt><b class="userinput"><tt>ln -s msdfs:serverB\\share,serverC\\share linkb</tt></b>
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</pre><p>You should set up the permissions and ownership of
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the directory acting as the DFS root such that only designated
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users can create, delete or modify the msdfs links. Also note
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that symlink names should be all lowercase. This limitation exists
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to have Samba avoid trying all the case combinations to get at
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the link name. Finally set up the symbolic links to point to the
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network shares you want, and start Samba.</p><p>Users on DFS-aware clients can now browse the DFS tree
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on the Samba server at \\samba\dfs. Accessing
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links linka or linkb (which appear as directories to the client)
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takes users directly to the appropriate shares on the network.</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2930696"></a>Common Errors</h2></div></div><div></div></div><div class="itemizedlist"><ul type="disc"><li><p>Windows clients need to be rebooted
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if a previously mounted non-dfs share is made a dfs
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root or vice versa. A better way is to introduce a
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new share and make it the dfs root.</p></li><li><p>Currently there's a restriction that msdfs
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symlink names should all be lowercase.</p></li><li><p>For security purposes, the directory
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acting as the root of the DFS tree should have ownership
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and permissions set so that only designated users can
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modify the symbolic links in the directory.</p></li></ul></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="printing.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 16. 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 18. Classical Printing Support</td></tr></table></div></body></html>
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