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authorAlexander Bokovoy <ab@samba.org>2003-04-30 21:26:24 +0000
committerAlexander Bokovoy <ab@samba.org>2003-04-30 21:26:24 +0000
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+<chapter id="msdfs">
+
+<chapterinfo>
+ <author>
+ <firstname>Shirish</firstname><surname>Kalele</surname>
+ <affiliation>
+ <orgname>Samba Team &amp; Veritas Software</orgname>
+ <address>
+ <email>samba@samba.org</email>
+ </address>
+ </affiliation>
+ </author>
+
+ <pubdate>12 Jul 2000</pubdate>
+</chapterinfo>
+
+
+<title>Hosting a Microsoft Distributed File System tree on Samba</title>
+
+<sect1>
+
+ <title>Instructions</title>
+
+ <para>The Distributed File System (or 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 etc. For more information about Dfs, refer to <ulink
+ url="http://www.microsoft.com/NTServer/nts/downloads/winfeatures/NTSDistrFile/AdminGuide.asp">
+ Microsoft documentation</ulink>. </para>
+
+ <para>This document explains how to host a Dfs tree on a Unix
+ machine (for Dfs-aware clients to browse) using Samba.</para>
+
+ <para>To enable SMB-based DFS for Samba, configure it with the
+ <parameter>--with-msdfs</parameter> option. Once built, a
+ Samba server can be made a Dfs server by setting the global
+ boolean <ulink url="smb.conf.5.html#HOSTMSDFS"><parameter>
+ host msdfs</parameter></ulink> parameter in the <filename>smb.conf
+ </filename> file. You designate a share as a Dfs root using the share
+ level boolean <ulink url="smb.conf.5.html#MSDFSROOT"><parameter>
+ msdfs root</parameter></ulink> 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
+ <filename>junction-&gt;msdfs:storage1\share1</filename> 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, \\storage1\share1).</para>
+
+ <para>Dfs trees on Samba work with all Dfs-aware clients ranging
+ from Windows 95 to 2000.</para>
+
+ <para>Here's an example of setting up a Dfs tree on a Samba
+ server.</para>
+
+ <para><programlisting>
+# The smb.conf file:
+[global]
+ netbios name = SAMBA
+ host msdfs = yes
+
+[dfs]
+ path = /export/dfsroot
+ msdfs root = yes
+ </programlisting></para>
+
+
+ <para>In the /export/dfsroot directory we set up our dfs links to
+ other servers on the network.</para>
+
+ <para><prompt>root# </prompt><userinput>cd /export/dfsroot</userinput></para>
+ <para><prompt>root# </prompt><userinput>chown root /export/dfsroot</userinput></para>
+ <para><prompt>root# </prompt><userinput>chmod 755 /export/dfsroot</userinput></para>
+ <para><prompt>root# </prompt><userinput>ln -s msdfs:storageA\\shareA linka</userinput></para>
+ <para><prompt>root# </prompt><userinput>ln -s msdfs:serverB\\share,serverC\\share linkb</userinput></para>
+
+
+ <para>You should set up the permissions and ownership of
+ the directory acting as the Dfs root such 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.</para>
+
+ <para>Users on Dfs-aware clients can now browse the Dfs tree
+ on the Samba server at \\samba\dfs. Accessing
+ links linka or linkb (which appear as directories to the client)
+ takes users directly to the appropriate shares on the network.</para>
+
+ <sect2>
+ <title>Notes</title>
+
+ <itemizedlist>
+ <listitem><para>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.</para>
+ </listitem>
+
+ <listitem><para>Currently there's a restriction that msdfs
+ symlink names should all be lowercase.</para>
+ </listitem>
+
+ <listitem><para>For security purposes, the directory
+ acting as the root of the Dfs tree should have ownership
+ and permissions set so that only designated users can
+ modify the symbolic links in the directory.</para>
+ </listitem>
+ </itemizedlist>
+ </sect2>
+</sect1>
+
+
+
+</chapter>