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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 22. 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 V1.59.1"><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="VFS.html" title="Chapter 21. Stackable VFS modules"><link rel="next" href="integrate-ms-networks.html" title="Chapter 23. Integrating MS Windows networks with Samba"></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 22. Hosting a Microsoft Distributed File System tree on Samba</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="VFS.html">Prev</a> </td><th width="60%" align="center">Part III. Advanced Configuration</th><td width="20%" align="right"> <a accesskey="n" href="integrate-ms-networks.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><h2 class="title"><a name="msdfs"></a>Chapter 22. Hosting a Microsoft Distributed File System tree on Samba</h2></div><div><div class="author"><h3 class="author">Shirish Kalele</h3><div class="affiliation"><span class="orgname">Samba Team & Veritas Software<br></span><div class="address"><p><br>
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<tt><<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 class="toc"><p><b>Table of Contents</b></p><dl><dt><a href="msdfs.html#id2899111">Instructions</a></dt><dd><dl><dt><a href="msdfs.html#id2899858">Notes</a></dt></dl></dd></dl></div><div class="sect1" lang="en"><div class="titlepage"><div><h2 class="title" style="clear: both"><a name="id2899111"></a>Instructions</h2></div></div><p>The Distributed File System (or Dfs) provides a means of
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separating the logical view of files and directories that users
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see from the actual physical locations of these resources on the
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network. It allows for higher availability, smoother storage expansion,
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load balancing etc. For more information about Dfs, refer to <a href="http://www.microsoft.com/NTServer/nts/downloads/winfeatures/NTSDistrFile/AdminGuide.asp" target="_top">
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Microsoft documentation</a>. </p><p>This document explains how to host a Dfs tree on a Unix
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machine (for Dfs-aware clients to browse) using Samba.</p><p>To enable SMB-based DFS for Samba, configure it with the
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<i><tt>--with-msdfs</tt></i> option. Once built, a
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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><tt>
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host msdfs</tt></i></a> parameter in the <tt>smb.conf
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</tt> file. You designate a share as a Dfs root using the share
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level boolean <a href="smb.conf.5.html#MSDFSROOT" target="_top"><i><tt>
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msdfs root</tt></i></a> parameter. A Dfs root directory on
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Samba hosts Dfs links in the form of symbolic links that point
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to other servers. For example, a symbolic link
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<tt>junction->msdfs:storage1\share1</tt> in
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the share directory acts as the Dfs junction. When Dfs-aware
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clients attempt to access the junction link, they are redirected
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to the storage location (in this case, \\storage1\share1).</p><p>Dfs trees on Samba work with all Dfs-aware clients ranging
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from Windows 95 to 2000.</p><p>Here's an example of setting up a Dfs tree on a Samba
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server.</p><pre class="programlisting">
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# The smb.conf file:
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[global]
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netbios name = SAMBA
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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><p><tt>root# </tt><b><tt>cd /export/dfsroot</tt></b></p><p><tt>root# </tt><b><tt>chown root /export/dfsroot</tt></b></p><p><tt>root# </tt><b><tt>chmod 755 /export/dfsroot</tt></b></p><p><tt>root# </tt><b><tt>ln -s msdfs:storageA\\shareA linka</tt></b></p><p><tt>root# </tt><b><tt>ln -s msdfs:serverB\\share,serverC\\share linkb</tt></b></p><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 class="sect2" lang="en"><div class="titlepage"><div><h3 class="title"><a name="id2899858"></a>Notes</h3></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><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="VFS.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="integrate-ms-networks.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 21. Stackable VFS modules </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 23. Integrating MS Windows networks with Samba</td></tr></table></div></body></html>
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