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System Administration

Connecting Apache's Web Server to Multiple Instances of Tomcat


An obstacle to running multiple instances is each instance would have to run on a unique port. Enter Apache's Web server. With the use of mod_jk, we were able to forward requests to specific hosts and contexts to the respective running instance of Tomcat.Pulling all of this together was not the hardest thing I've done; however, it did prove challenging due to a lack of documentation. By no means, though, is this statement a stab at any of the development teams. In fact, the developers themselves helped me on numerous occasions when I found myself in over my head. When the documentation had me confused or I could not find exactly what I was looking for, I would head over to #tomcat or #apache on and pose my question there. Usually, I received a response within minutes.

The following software was used for the purposes of this article. See the resources section at the end of this article for download locations:


Hosting servlets via Apache, mod_jk, Tomcat, mod_ssl and a few rewrite rules


Hosting multiple Java Web-enabled applications with Apache/SSL in combination with Tomcat is potentially highly detailed. Separating the dynamic from the static content requires URL rewriting and aliases. This article discusses one viable configuration. I describe the basics of how to host multiple Java Web applications using a pure Apache project approach. In other words, I explain how to apply Apache, mod_ssl, some rewrite rules and the Tomcat Servlet container to gain control of a consistent and viable production environment. I condense the experience gained and explain the most relevant details here. I take this article somewhat further by adding the ability to provide secure communication via SSL and show how to optimize performance by separating dynamic content, such as JSP pages, from static content, such as HTML and images. Further security issues also are nodded at briefly.


Mod Evasive for Apache (First line of defence against DOS attacks)


Mod Evasive (mod_evasive) is a module for Apache web server. Within this, you can define certain limits on it for people trying

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to access a page on your website, such as ability to access the same page (more than once) within a


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second. This is normally an indication of DOS attack. Mod_evasive successfully intercepts such attack and returns a 403 (Forbidden) message to the attacker. Here is how it will be implemented.



Mod Bandwidth for Apache (Control your Website Bandwidth)


It is used to limit bandwidth utilization of your normal and virtual hosts.

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