LAMP

PHP the most popular scripting language in the world. Many people use it for different things. I recently worked on a custom joomla component that required a scheduled task (cronjob). The task required joomla libraries so I created a "cronjob" controller to handle this scenario. Controller gives access to all MVC features, such as models and therefore tables. If you know, Joomla has only one entry point and it is right through the front door (e.g. index.php) with parameters that route to desired destination. When I wanted to schedule my crontab I found out that it is not as simple as it seems. Here is what you have to do to create any cronjob that executes php page/script and required query string (key/value) parameters.

Virtualization is very popular nowadays. There is no need to have hundreds of phisical computers, one powerful server can manage 10+ virtual machines on its own. I worked on a distributed application with share nothing architecture that requiered minimum of 8 nodes and a master server. The nodes interact with master server via API calls and constantly processed little chunks of data (time consuming task with little CPU usage) and reported back to the master server. The problem arrised when VMware Server started getting slugish,  therefore all the nodes became very slow. To fix the problem I came out with idea to minimize the nodes at much as possible, living only importan operating system and application specific services running. In this article you will find out how to setup RHEL (Cent OS 5) server with minimal resource usage and how to work around crazy RHEL caching that uses 50%+ of RAM.

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