Release Found: Red Hat Enterprise Linux 5

Problem

The module mod_jk is currently included as part of the Application Stack channel and is not available in the base Red Hat Enterprise Linux channel. This is an issue when there is a requirement to connect httpd and the back end server using the AJP protocol, and an Application Stack entitlement is not a possibility.

Assumptions

• You have Red Hat Enterprise Linux 5 installed.

• You do not have an Application Stack subscription.

• There is a requirement to connect httpd and the back end server using the AJP protocol.

Solution

The httpd package provides a module by the name mod_proxy_ajp that can be used to connect httpd and the back end server using the AJP protocol.

The mod_proxy_ajp configuration file is located at /etc/httpd/conf.d/proxy_ajp.conf. Edit this configuration file according to the needs of the environment.

Examples

Example 1: Forward all requests to the /examples/ context to a single Tomcat back end serving the Tomcat jsp examples:

ProxyPass /examples/ ajp://localhost:8009/jsp-examples/

Example 2: Forward all requests to the /jmx-console/ context and jsp pages under the /myapp/ context to two JBoss back ends with equal load balancing weight.

<Proxy balancer://mycluster>
  BalancerMember ajp://192.168.1.2:8009 route=node1 loadfactor=1 ping=10 ttl=600
  BalancerMember ajp://192.168.1.3:8009 route=node2 loadfactor=1 ping=10 ttl=600
</Proxy>

ProxyTimeout 10
ProxyStatus On

ProxyPass /jmx-console balancer://mycluster/jmx-console stickysession=JSESSIONID timeout=10
ProxyPassMatch ^/myapp/(.*.jsp) balancer://mycluster/myapp/$1 stickysession=JSESSIONID timeout=10

ProxyPassReverse / ajp://192.168.1.2:8009/
ProxyPassReverse / ajp://192.168.1.3:8009/

References

[1] How do I migrate from Apache mod_jk to mod_proxy_ajp or mod_proxy_http using JBoss Server?.