Mod proxy ajp
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How to configure mod_proxy_ajp with Tomcat ?
mod_proxy_ajp is an Apache module which can be used to forward a client HTTP request to an internal Tomcat application server using the AJP protocol.
To respond to the question "Why should I use mod_proxy_ajp rather than a classic mod_proxy ?", here is a small recap:
- You can gain a lot of flexibility (lot of the apache modules/features can be used especially "name-based virtual hosting")
- Practical for those who need to support Java applications along with PHP / Perl … (only one apache server is needed)
- Certificates management is easier in apache configuration (this argument is a lot subjective)
- It's not Tomcat's main objective to serve http static resources (not optimized for that)
- Load balancing/cluster management is easier with an apache frontend
Tomcat configuration
You just have to create the AJP connector in the conf/server.xml file like that:
<Connector port="8009" enableLookups="false" redirectPort="8443" protocol="AJP/1.3" />
Apache2 configuration
One way (useful if this apache is a global front end) is to create a virtual host for this application.
Listen 1979
NameVirtualHost *:1979
<VirtualHost *:1979>
ServerName localhost
ErrorLog /var/log/apache2/ajp.error.log
CustomLog /var/log/apache2/ajp.log combined
<Proxy *>
AddDefaultCharset Off
Order deny,allow
Allow from all
</Proxy>
ProxyPass / ajp://localhost:8009/
ProxyPassReverse / ajp://localhost:8009/
</VirtualHost>
References
- http://tomcat.apache.org/tomcat-7.0-doc/proxy-howto.html
- http://httpd.apache.org/docs/2.2/mod/mod_proxy.html
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