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OSF DCE Administration Guide—Introduction
The files in the dceshared subtree can be kept on local machines or, preferably, they can
be exported to other machines in the DCE cell by using DFS. Therefore, shareable files,
including binaries that are addressed by @sys, are stored under dceshared. The
dceshared subtree is read-only.
All files generated by a DCE build, all files delivered to binary licensees, and if
appropriate, all files delivered to source licensees are initially stored in the dceshared
subdirectories. All files in the dceshared subdirectories are kept unmodified over the
lifetime of an installed DCE release. Configuration and data files are only stored as
templates in dceshared. The actual working set of data files is located in the
dcelocal/var and dcelocal/etc subdirectories.
The default pathname prefix for dceshared is /opt/dce, which is a symbolic link to
/opt/dce1.0, or for DFS, to /:/opt/dce1.0 (the short form of /.:/fs/opt/dce1.0). This entry
is always physically located at the local machine.
Therefore, the local system
administrator (or the respective software administrator) must have write permission to
modify this link. You can redirect this link from the fileset on the local machine to the
cell-wide accessible fileset as soon as the local machine is configured and the cell is
available; for example, redirect /opt/dce to /:/opt/dce1.0.
Note: Special care must be taken because this link is crucial for protecting the
local machine if it is running as client and for protecting the server
machine if it is acting as service provider. This symbolic link must be
created in a protected directory, which is comparable to /etc. Only the
local system administrator needs to have write and modify permissions to
this directory.
To avoid having replicas of dceshared files on local machines, you can use a symbolic
link to access the cell-wide versions of these files. In case DFS users do not want to
have replicas of these files physically stored on their local machine, they can remove the
dceshared subtree that is installed on the local machine and redirect the default symbolic
link to the cell-wide dceshared subtree, if these particular files are available there. The
subdirectory that dceshared points to has a version number associated with the pathname
that provides the capability of running multiple versions of DCE in one cell. This
capability is sometimes required in an intermediate phase of upgrading to a new release.
An additional advantage is a simplified deinstallation procedure.
If necessary, you can create copies or symbolic links from the other locations to
/opt/dce/*, such as dcelocal/var, dcelocal/etc, dcelocal/bin, and /usr/bin. These
guidelines are based on the assumption that you want to use the DCE capability of cell-
wide file sharing.
The pathname for dceshared is set at compile time and is not
associated with any particular version number.
4.2 The dcelocal Subtree
In order to initially boot a server and configure the cell, the appropriate files for
mandatory servers (CDS and Security) need to be available on that server machine (in
the dcelocal subtree). It is strongly recommended that copies of the minimum set of
programs and data files that were installed during the default DCE installation procedure
be
kept
locally
on server
machines
for standalone
operation
and emergency
4− 2
Tandem Computers Incorporated
124244
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