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+<H1>Administration Reference</H1>
+<HR><P ALIGN="center"> <A HREF="../index.htm"><IMG SRC="../books.gif" BORDER="0" ALT="[Return to Library]"></A> <A HREF="auarf002.htm#ToC"><IMG SRC="../toc.gif" BORDER="0" ALT="[Contents]"></A> <A HREF="auarf018.htm"><IMG SRC="../prev.gif" BORDER="0" ALT="[Previous Topic]"></A> <A HREF="#Bot_Of_Page"><IMG SRC="../bot.gif" BORDER="0" ALT="[Bottom of Topic]"></A> <A HREF="auarf020.htm"><IMG SRC="../next.gif" BORDER="0" ALT="[Next Topic]"></A> <A HREF="auarf284.htm#HDRINDEX"><IMG SRC="../index.gif" BORDER="0" ALT="[Index]"></A> <P>
+<P>
+<H2><A NAME="HDRCLI_CSDB" HREF="auarf002.htm#ToC_17">CellServDB (client version)</A></H2>
+<P><STRONG>Purpose</STRONG>
+<A NAME="IDX3912"></A>
+<A NAME="IDX3913"></A>
+<A NAME="IDX3914"></A>
+<A NAME="IDX3915"></A>
+<A NAME="IDX3916"></A>
+<A NAME="IDX3917"></A>
+<A NAME="IDX3918"></A>
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+<P>Lists the database server machines in all cells accessible from the machine
+<P><STRONG>Description</STRONG>
+<P>The client version of the <B>CellServDB</B> file lists the database
+server machines in the local cell and any foreign cell that is to be
+accessible from the local client machine. Database server machines run
+the Authentication Server, Backup Server, Protection Server, and Volume
+Location (VL) Server (the <B>kaserver</B>, <B>buserver</B>,
+<B>ptserver</B>, and <B>vlserver</B>) processes, which maintain the
+cell's administrative AFS databases.
+<P>The Cache Manager and other processes running on a client machine use the
+list of a cell's database server machines when performing several common
+functions, including:
+<UL>
+<P><LI>Fetching files. The Cache Manager contacts the VL Server to learn
+the location of the volume containing a requested file or directory.
+<P><LI>Authenticating users. Client-side authentication programs (such as
+an AFS-modified login utility or the <B>klog</B> command interpreter)
+contact the Authentication Server to obtain a server ticket, which the AFS
+server processes accept as proof that the user is authenticated.
+<P><LI>Creating protection groups. The <B>pts</B> command interpreter
+contacts the Protection Server when users create protection groups or request
+information from the Protection Database.
+</UL>
+<P>The Cache Manager reads the <B>CellServDB</B> file into kernel memory
+as it initializes, and not again until the machine next reboots. To
+enable users on the local machine to continue accessing the cell correctly,
+update the file whenever a database server machine is added to or removed from
+a cell. To update the kernel-resident list of database server machines
+without rebooting, use the <B>fs newcell</B> command.
+<P>The <B>CellServDB</B> file is in ASCII format and must reside in the
+<B>/usr/vice/etc</B> directory on each AFS client machine. Use a
+text editor to create and maintain it. Each cell's entry must have
+the following format:
+<UL>
+<P><LI>The first line begins at the left margin with the greater-than character
+(<B>></B>), followed immediately by the cell's name without an
+intervening space. Optionally, a comment can follow any number of
+spaces and a number sign (<B>#</B>), perhaps to identify the organization
+associated with the cell.
+<P><LI>Each subsequent line in the entry identifies one of the cell's
+database server machines, with the indicated information in order:
+<UL>
+<P><LI>The database server machine's IP address in dotted-decimal
+format.
+<P><LI>One or more spaces.
+<P><LI>A number sign (<B>#</B>), followed by the machine's fully
+qualified hostname without an intervening space. This number sign does
+not indicate that the hostname is a comment. It is a required
+field.
+</UL>
+</UL>
+<P>No extra blank lines or newline characters are allowed in the file, even
+after the last entry. Their presence can prevent the Cache Manager from
+reading the file into kernel memory, resulting in an error message.
+<P>The AFS Product Support group maintains a list of the database server
+machines in all cells that have registered themselves as receptive to access
+from foreign cells. When a cell's administrators change its
+database server machines, it is customary to register the change with the AFS
+Product Support group for inclusion in this file. The file conforms to
+the required <B>CellServDB</B> format, and so is a suitable basis for the
+<B>CellServDB</B> file on a client machine. Contact the AFS Product
+Support group for directions on accessing the file.
+<P>The client version of the <B>CellServDB</B> file is distinct from the
+server version, which resides in the <B>/usr/afs/etc</B> directory on each
+AFS server machine. The client version lists the database server
+machines in every AFS cell that the cell administrator wants the
+machine's users to be able to access, whereas the server version lists
+only the local cell's database server machines.
+<P><STRONG>Examples</STRONG>
+<P>The following example shows entries for two cells in a client
+<B>CellServDB</B> file and illustrates the required format.
+<PRE> >abc.com # ABC Corporation
+ 192.12.105.2 #db1.abc.com
+ 192.12.105.3 #db2.abc.com
+ 192.12.107.3 #db3.abc.com
+ >test.abc.com # ABC Corporation Test Cell
+ 192.12.108.57 #testdb1.abc.com
+ 192.12.108.55 #testdb2.abc.com
+
+</PRE>
+<P><STRONG>Related Information</STRONG>
+<P><A HREF="auarf020.htm#HDRSV_CSDB">CellServDB (server version)</A>
+<P><A HREF="auarf154.htm#HDRFS_NEWCELL">fs newcell</A>
+<P><A HREF="auarf200.htm#HDRKLOG">klog</A>
+<P>
+<HR><P ALIGN="center"> <A HREF="../index.htm"><IMG SRC="../books.gif" BORDER="0" ALT="[Return to Library]"></A> <A HREF="auarf002.htm#ToC"><IMG SRC="../toc.gif" BORDER="0" ALT="[Contents]"></A> <A HREF="auarf018.htm"><IMG SRC="../prev.gif" BORDER="0" ALT="[Previous Topic]"></A> <A HREF="#Top_Of_Page"><IMG SRC="../top.gif" BORDER="0" ALT="[Top of Topic]"></A> <A HREF="auarf020.htm"><IMG SRC="../next.gif" BORDER="0" ALT="[Next Topic]"></A> <A HREF="auarf284.htm#HDRINDEX"><IMG SRC="../index.gif" BORDER="0" ALT="[Index]"></A> <P>
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