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