Network Router User Manual

GINA V4.0 System Administrator Guide – September 2000 45
Overview
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The communication structure of a system can be depicted by a graph with nodes and
edges. The nodes correspond to the applications, while the edges represent the communi-
cation channels. The first three blocks in the diagram define the nodes of the graph with
respect to the specific system, host or application; the last block describes the edges of the
graph.
From the input data (which has already been explained), the configuration generator
config creates the following output data for each application of each host:
– for each application:
a GINA-specific address file containing all addressable server applications
– for each application:
a configuration file for the transaction monitor used by GINA
– for each host:
a list of the necessary TNSX entries
The configuration can be performed on a central computer for the entire system. The files
created in the process can then be distributed to the target computers and installed there.
The final tasks which must be performed locally are carried out during this installation. Mov-
ing the final tasks to the target computers eliminates the need to install the transaction mon-
itor on the generation computer. Because the output data for the generation comprises only
text files, the hardware and operating system independence of the configuration process is
also guaranteed.
In the first version of the configuration tool, the procedure is that change requests are sent
to a central location and that a new configuration process will be implemented from there
only. The configuration generator makes it easier to configure the runtime environment for
T-ORB and T-ORB/Client. Revision generation is described in section 6.3 on page 88.
A central configuration is recommended for the following reasons:
– It does not make sense to change the configuration on the local target computers
because these modifications will be overwritten with the next global update process.
– Another argument against changing the settings locally is that modifications to the hier-
archy of the system often affect more than one host. It is precisely changes of this type
that require consistency checks, which are not possible on the local level.