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August, 15th 2013 was Debian’s 20th anniversary. The Debian Project is a massive community-driven open-source project devoted to a single goal: build a free Linux operating system. While many folks regularly use Debian operating system as end-users, system admins or developers, you may not know the interesting history and facts behind Debian itself. Below are a list of things that you may not know about Debian GNU/Linux.

Snort is by far the most popular open-source network intrusion detection and prevention system (IDS/IPS) for Linux. There are cases where you want to build Snort from source code, not install it from Linux packages. This tutorial describes how to compile and install Snort from source code.

Eclipse boasts of an extensible plug-in system for customizing IDE to support various programming languages including Java, C/C++, etc. Eclipse CDT is one such plugin which converts Eclipse into a fully functional IDE for C/C++ developers. This tutorial talks about how to set up C/C++ development in Eclipse by installing Eclipse CDT.

OpenVAS is an open-source framework consisting of a suite of tools for vulnerability scanning and management. OpenVAS is freely available on multiple platforms, and licensed under the GPL. This article talks about how to conduct security vulnerability assessment of a remote server with OpenVAS.

Nmap is popular network scanner software that can actively probe a particular host or a network to infer in-depth information about them. While Nmap itself is a command-line utility, you can run it along with its GUI front-end called Zenmap. This tutorial talks about how to scan particular hosts or networks by using Nmap GUI.

HandBrake is one of the most popular open-source video transcoder software. It is available on multiple platforms including MacOS, Windows and Linux. This tutorial talks about how to install HandBrake on different Linux distros.

In a server environment, it is wise to back up various server configurations in /etc directory regularly, to save trouble from any accidental changes in the directory, or re-installation of necessary packages. Better yet, it is a good idea to “version control” everything in /etc directory. This tutorial describes how to version control /etc directory in Linux with etckeeper.

If you store and maintain mission-critical data on your server, you probably want to back them up on a remote site for disaster recovery. Duplicity is a free command line backup tool in Linux. This tutorial describe how to create a secure incremental offsite backup in Linux with Duplicity.

Clonezilla is a feature-rich and user-friendly disk cloning and backup software which is under GPL. Clonezilla provides a convenient interface for cloning a disk/partition to another local device, or archiving a cloned image to an external SSH/Samba/NFS server. This tutorial describes how to back up or restore hard drives with Clonezilla.

Subversion (SVN) is supported by all major open-source project hosting sites such as Google Code, GitHub, SourceForge and Launchpad. You can of course set up your own SVN server in house. This tutorial talks about how to set up a SVN server on CentOS or Fedora.

Network-attached storage (NAS) is a dedicated disk storage appliance that is typically connected to a local network, in order to provide file-based or block-based data storage services to other client computers over the network. This tutorial describes how to build a network attached storage (NAS) server with Openfiler.

In Linux, doxygen is the de facto standard tool for automatically generating cross-reference documentation from annotated source code. Doxygen is helpful when you are trying to publish source-code documentation for your project, or reading other people's code. This tutorial talks about how to automatically generate documentation from source code in Linux.

When you run a virtual machine (VM) on VMware, the default boot sequence of the VM is “removable devices -> hard drive -> CD-ROM drive”. If you want to boot a VM from an ISO image instead, you need to change the boot sequence of the VM, so that it starts with CD-ROM drive. This tutorial describes how to change the boot order of a VMware VM.

Tiny Core Linux is a minimal Linux operating system whose size (12 MB) can easily fit into physical memory. It includes a base core system, as well as GUI extensions for FLTK/FLWM-based desktop environment. Additional functionality can be provided by extensions. Tiny Core Linux can boot from a live CD or a USB stick, and the entire operating system runs completely in main memory.

VirtualBox Guest Additions are a set of device drivers and system applications which are designed to be installed in the guest operating systems of VirtualBox. This tutorial describes how to install VirtualBox Guest Additions for Linux.

While a typical archive file relies on a separate program (e.g., tar, gunzip) to extract content from the archive file, a self-extracting (SFX) archive/installer is an executable itself, and can self-extract its content simply upon running. This tutorial describes how to create an SFX archive or installer in Linux

Microsoft offers free VMs for web browser testing purposes. This tutorial describes how to install Microsoft Windows as a guest VM on VirtualBox for free. If you wanted to run some native Windows applications on Linux platform, this tutorial should be helpful to you.

Most VirtualBox users may think that VirtualBox is only intended for use in a desktop environment. However, VirtualBox can in fact run on a headless server, and VirtualBox VMs launched in headless mode can be managed remotely from an external VirtualBox client. This tutorial describes how to set this up.

If you are using a virtualization package, your main concern will be its performance, or in another word, its virtualization overhead. This article presents performance evaluation of two most popular virtualization packages, VMware Player and VirtualBox.