web server - Borland Technical Publications

Configuring your Apache web server to invoke a CORBA server
For example:
ClusterList=cluster1,cluster2,cluster3
cluster1.webcontainer_id = tc_inst1
cluster2.webcontainer_id = corbaloc::127.20.20.2:20202,:127.20.20.3:20202/
tc_inst2
cluster2.enable_loadbalancing = true
Note
Note
cluster3.webcontainer_id = tc_inst3
cluster3.enable_loadbalancing = false
In the above example, the following three clusters are defined:
1 The first, uses the osagent naming scheme and is enabled for load balancing.
2 The second cluster employs the corbaloc naming scheme, and is also enabled for
load balancing.
3 The third uses the osagent naming scheme, but has the load balancing features
disabled.
To disable use of a particular cluster, simply remove the cluster name from the
ClusterList list. However, we recommend you do not remove clusters with active http
sessions attached to the CORBA server (attached users), because requests to these
“live” sessions will fail.
Modifications you make to the WebClusters.properties file automatically take effect on
the next request. You do not need to restart your server(s).
Mapping URIs to defined clusters
Once the cluster entry is defined, all that remains is to identify which HTTP requests
received by the web server need to be forwarded to your CORBA server. Use the
UriMapFile.properties file to map http uri strings to web cluster names (CORBA
instances) configured in the WebClusters.properties file.
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In the UriMapFile.properties file, type:
=
where is a standard URI string or a wild-card string, and
is the cluster name as it appears in the ClusterList entry in the
WebClusters.properties file.
For example:
/examples = cluster1
/examples/* = cluster1
Note
/petstore/index.jsp = cluster2
/petstore/servlet/* = cluster2
In this example:
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Any URI that starts with /examples will be forwarded to a CORBA server running in
the “cluster1” web cluster.
URIs matching either /petstore/index.jsp or starting with /petstore/servlet will be
routed to “cluster2”.
With the URI mappings, the wild-card “*” is only valid in the last term of the URI and
may represent the follow cases:
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the whole term (and all inferior references) as in /examples/*.
the filename part of a file specification as in /examples/*.jsp.
Chapter 8: Apache web server to CORBA server connectivity 71