Clustering › How to Set Up Load Balancing › Update the httpd.conf File

Update the httpd.conf File

Updating the httpd.conf file is a required task when you set up load balancing.

To update the httpd.conf file

1. Open the conf/httpd.conf file in the Apache HTTP Server installation directory and update it to include the following specifications:

   Listen 89
   LoadModule jk_module modules/mod_jk.so
   JkWorkersFile conf/workers.properties
   

   <VirtualHost *:89>
    ServerName load balancer host name
   

    JkMountFile conf/uriworkermap.properties
    JkLogFile logs/mod_jk.log
    JkLogLevel debug
   </VirtualHost>
   

2. Find the following lines:

   JkLogFile logs/mod_jk.log
   JkLogLevel debug
   

3. (Optional) Replace the lines in the previous step with the following lines:

   JkLogFile "|bin/rotatelogs.exe logs/mod_jk.log.%Y-%m-%d-%H_%M_%S 10M"
   JkLogLevel emerg
   

   This action modifies the mod_jk.log file on your production server to record only critical errors and to enable log automatic rollover when its file size reaches 10 MB.

4. Add a Listen directive with the port number for every VirtualHost port in the file.

   For example, suppose you have defined a virtual host at port 89, as follows:

   <VirtualHost *:89>
   

   In that case, add the Listen directive for this port in the httpd.conf file, for example:

   Listen 89
   

   Note: The commonly used port is 89.

   This specification enables the Apache HTTP Server to listen on this port and accept incoming requests.

5. Change the Default Type from text/plain to text/html.
   Note: This setting works well on most browsers. If you experience any difficulty with system performance or display quality after changing this option, return it to its original value.
6. Save and close the conf/httpd.conf file.
7. Adjust related settings in other locations.
8. Disable the HTTP ports of the cluster computers.

You have updated the httpd.conf file.

Adjust Related Settings

Adjusting related settings is a required task when you update the httpd.conf file.

To adjust related settings

1. Open your web browser and set the proper values for the ServerAdmin and ServerName options, if you have not done so.
2. Restart the Apache service, as follows:
   1. Open the Apache Service Monitor.
   2. Highlight the service to restart.
   3. Click Restart.
3. Test by accessing the link http://loadbalancerhostname:89/wl or any other context for CA Workflow and http://hostname:89/usm for Service View.

   Here, hostname specifies the load balancer computer, that is, the computer on which the Apache HTTP Server is configured for load balancing. For example, if the host name of the load balancer computer is ABC, then the link is http://ABC:89/wl.

4. Review the mod_jk.log file under the logs folder in the Apache directory to determine which jvmRoute node was called. An example follows:

   found worker HOST1__USMView (HOST1__USMView) for route COMPUTER1__USMView and partial sessionid
   

You have adjusted settings related to the httpd.conf file.