In Ubuntu, using apt-get to install mod_jk is really easy. However, sometimes I need to do this with alternative operating systems such as Solaris.
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There are still a few more steps. Go back and continue reading from Enable mod_jk of Apache Tomcat Connector.
References
Comparison against mod_proxy_http and mod_proxy_ajp - http://www.tomcatexpert.com/blog/2010/06/16/deciding-between-modjk-modproxyhttp-and-modproxyajp