High availability Tomcat Connect Tomcat servers to Apache and to each other to keep your site running

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Tutorial: High availability Tomcat Connect Tomcat servers to Apache and to each other to keep your site running

If you run only one instance of Tomcat, you lose requests/sessions whenever you upgrade or restart your site. In this article, author Graham King presents simple steps for connecting a pair (or more) of Tomcats to Apache using the JK2/AJP (Apache JServ Pr

Tutorial Details:

of the Tomcat servers can be stopped or started without affecting users. With an Apache/Tomcat cluster in place, you can easily adjust your configuration for a range of load-balancing and failover scenarios.

You've written a Web application that runs happily in production on Tomcat, probably on port 80. Some early problems might include complaints from your security team because your server runs as a root facing the outside world and excessive traffic—traffic beyond what a single server can deal with.

A far more likely problem, however, is that you will need to issue new releases of your application. You may even need to upgrade your version of Tomcat or the operating system. These tasks will require you to restart Tomcat. And whenever you do that, your site will become unavailable.

To prevent such an outcome, you move your main server to port 8081, set up a secondary server identical to the primary one on 8082, and some form of dispatcher on port 80. The dispatcher directs traffic to the secondary server while you upgrade the primary one.

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