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15 <H1>Administration Reference</H1>
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18 <H2><A NAME="HDRCLI_THISCELL" HREF="auarf002.htm#ToC_30">ThisCell (client version)</A></H2>
19 <P><STRONG>Purpose</STRONG>
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25 <P>Defines client machine's cell membership
26 <P><STRONG>Description</STRONG>
27 <P>The client version of the <B>ThisCell</B> file defines the complete
28 Internet domain-style name (for example, <B>abc.com</B>) of the
29 cell to which the local client machine belongs. It must reside in the
30 <B>/usr/vice/etc</B> directory on every AFS client machine. To
31 change a client machine's cell membership, edit the file and reboot the
33 <P>The file is in ASCII format and contains a character string on a single
34 line. The <I>AFS Quick Beginnings</I> instructs the administrator
35 to create it during the installation of each client machine.
36 <P>The client machine's cell membership determines three defaults
37 important to its functioning:
39 <P><LI>The cell in which the machine's users authenticate by default.
40 The effect is two-fold:
42 <P><LI>The AFS-modified login utilities and the <B>klog</B> command
43 interpreter contact an Authentication Server in the cell named in the
44 <B>ThisCell</B> file (unless <B>-cell</B> argument to the
45 <B>klog</B> command specifies an alternate cell).
46 <P><LI>The command interpreters combine the cell name with the password that the
47 user provides, generating an encryption key from the combination. For
48 authentication to succeed, both the cell name and password must match the ones
49 used to generate the user's encryption key stored in the Authentication
52 <P><LI>The cell the Cache Manager considers its local, or home, cell. By
53 default, the Cache Manager allows programs that reside in its home cell to run
54 with setuid permission, but not programs from foreign cells. For more
55 details, see the <B>fs getcellstatus</B> and <B>fs setcell</B>
57 <P><LI>Which AFS server processes the local AFS command interpreters contact by
58 default as they execute commands issued on the machine.
60 <P>The client version of the <B>ThisCell</B> file is distinct from the
61 server version, which resides in the <B>/usr/afs/etc</B> directory on each
62 AFS server machine. If a server machine also runs as a client, it is
63 acceptable for the server and client versions of the file on the same machine
64 to name different cells. However, the behavior that results from this
65 configuration can be more confusing than useful.
66 <P><STRONG>Related Information</STRONG>
67 <P><A HREF="auarf033.htm#HDRSV_THISCELL">ThisCell (server version)</A>
68 <P><A HREF="auarf144.htm#HDRFS_GETCELLSTATUS">fs getcellstatus</A>
69 <P><A HREF="auarf159.htm#HDRFS_SETCELL">fs setcell</A>
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