Linux

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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Even though archiving standards are zip and gz some people like to deversify and use different archiving programs like rar. Fist of all, there is nothing wrong with using rar, it is a great program. Only problem is that rar is not always supported and need special software to open it. On windows users may use WinRAR or 7z, but on Linux this proces is little bit painful. In order for us to open rar archive we need to have unrar package installed.