{"id":1359,"date":"2009-09-23T09:33:38","date_gmt":"2009-09-23T13:33:38","guid":{"rendered":"http:\/\/onlineappsdba.com\/index.php\/2009\/09\/23\/configure-oracle-http-server-infront-of-oracle-weblogic-server-mod_wl_ohs\/"},"modified":"2017-02-27T03:45:50","modified_gmt":"2017-02-27T07:45:50","slug":"configure-oracle-http-server-infront-of-oracle-weblogic-server-mod_wl_ohs","status":"publish","type":"post","link":"https:\/\/onlineappsdba.com\/index.php\/2009\/09\/23\/configure-oracle-http-server-infront-of-oracle-weblogic-server-mod_wl_ohs\/","title":{"rendered":"Configure Oracle HTTP Server infront of Oracle WebLogic Server mod_wl_ohs"},"content":{"rendered":"

\"\"<\/a><\/p>\n

mod_wl_ohs<\/strong>:\u00a0is a\u00a0module\u00a0in Oracle HTTP Server 11g R1\u00a0which\u00a0allows requests to be proxied from O<\/strong>racle H<\/strong>TTP S<\/strong>erver (OHS)\u00a0to Oracle WebLogic Server.<\/p>\n

mod_weblogic<\/strong>: This module is part of Apache HTTP Server and allows requests to be proxied from Apache HTTP Server to Oracle WebLogic Server.<\/p>\n

For\u00a0difference between mod_wl_ohs<\/strong> and mod_weblogic<\/strong> click here<\/a><\/p>\n

Things good to know about configuring OHS infront of weblogic
\n<\/u><\/strong><\/p>\n

1. <\/strong>You can use Fusion Middleware control \/em<\/strong>\u00a0(register OHS with weblogic Server to access it from control) , steps here<\/a>\u00a0 or directly update httpd.conf<\/strong>\u00a0 (steps given below) to configure mod_wl_ohs<\/strong><\/p>\n

2. <\/strong>If weblogic server is clustered then mod_wl_ohs <\/strong>uses simple round-robin to forwards requests from HTTP Server to all available weblogic servers.
\nmod_wl_ohs<\/strong> directs HTTP requests containing a cookie<\/strong>, URL-encoded session<\/strong>, or a session stored in the POST data<\/strong> to the server in the cluster that originally created the cookie.<\/p>\n

3. <\/strong>mod_wl_ohs (as of 11gR1) only support container level failover<\/strong> and\u00a0NOT <\/strong>application level failover. mod_wl_ohs continues to route requests to a down application as long as the managed server is up and running.<\/p>\n

4.<\/strong>\u00a0Configuration file of mod_wl_ohs <\/strong>is $INSTANCE_HOME\/ config\/ OHS\/ <component_name>\/ mod_wl_ohs.conf <\/strong>and included in $INSTANCE_HOME\/ config\/ OHS\/ <component_name>\/<\/strong> httpd.conf<\/strong> (entry like
\ninclude “${ORACLE_INSTANCE}\/ config\/ ${COMPONENT_TYPE}\/${COMPONENT_NAME}\/ mod_wl_ohs.conf”<\/span>)<\/p>\n

5. <\/strong>mod_wl_ohs module file is\u00a0available at\u00a0$ORACLE_HOME\/ ohs\/ modules\/ mod_wl_ohs.so<\/strong><\/p>\n

6.<\/strong> You can either use URL like \/console using location directive<\/strong> (<Location \/console>) or MatchExpression<\/strong>\u00a0directive<\/strong> in mod_wl_ohs.conf <\/strong>to\u00a0forward requests from HTTP Server to WebLogic Server.<\/p>\n

7.<\/strong> While starting OHS on Windows, if you see error like
\n—
\nC:\/atul\/ fmw\/ instances1\/ config\/ OHS\/ ohs1\/ mod_wl_ohs.conf:
\nCannot load C:\/ atul\/ fmw\/ ohs\/ modules\/ mod_wl_ohs.so into server: The specified module could not be found<\/span>
\n—<\/p>\n

Check mod_wl_ohs.so<\/strong> exists in specified location, if yes then
\nCopy “$ORACLE_HOME\\ oui\\ lib\\ win32\\ msvcp71.dll” to “c:\\ windows\\ system32” and try again<\/p>\n

.
\nConfigure HTTP Serer infront of WebLogic Server<\/u><\/strong><\/p>\n

1. <\/strong>Install WebLogic Server and define server listening on port XXXX (7001 in this example)<\/p>\n

2.<\/strong> Install Oracle HTTP Sever 11g steps here<\/a><\/p>\n

3.<\/strong> Modify mod_wl_ohs.conf<\/strong>
\n$ORACLE_INSTANCE\/ config\/ <COMPONENT_TYPE>\/ <COMPONENT_NAME>\/ mod_wl_ohs.conf<\/strong><\/p>\n

a) For weblogic single instance <\/strong><\/p>\n

<Location \/console<\/strong>>
\nSetHandler weblogic-handler
\nWebLogicHost server1<\/strong>
\nWeblogicPort 7001<\/strong>
\n<\/Location><\/p>\n

* This will forward \/console from HTTP server to \/console\u00a0on WebLogic Server server1:7001
\n<\/span>
\nb) For Weblogic instances in cluster <\/strong><\/p>\n

<Location \/myServerURL>
\nSetHandler weblogic-handler
\nWebLogicCluster server1:7010,server2:7010<\/strong>
\n<\/Location><\/p>\n

* This will forward \/myServerURL from HTTP server to \/myServerURL\u00a0on WebLogic\u00a0Cluster server1:7010 and server2:7010<\/span>
\n4. <\/strong>Restart HTTP Server
\n$INSTANCE_HOME\/ bin\/ opmnctl restartproc ias-component=ohs1<\/strong><\/p>\n

5. <\/strong>Test that you can access application deployed on Weblogic using Oracle HTTP Server like<\/p>\n

http:\/\/servername:ohs_http_port\/console<\/strong><\/p>\n

.<\/p>\n

References<\/u><\/strong><\/p>\n