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Linux

Install OpenWRT, Chillispot, FreeRadius Based Managed Hotspot(s) Including PayPal Payment Gateway

Post date: March 23, 2008, 14:03 Category: Miscellaneous Views: 6653 Comments
Tutorial quote: If you have ever tried to implement one of the hotspot HowTos on this and other sites, it might have dawned on you that this is not an easy feat to accomplish. Amazingly most solutions also leave out the most important part – how to get paid by the punters using the hotspot. Some will offer prepaid solution or access tickets that need to be printed, but this will require staff being involved on the premises. And in particular, once you want to offer a professional service and not just a toy concept it gets tricky – and expensive. Just imagine all the servers you need to provide redundant and load balanced freeradius, mysql and web servers. It is generally not worth the effort and expense for just one hotspot – unless of course you are willing to accept outages, unhappy customers etc.
Linux

Passive Checks and NSCA using Nagios

Post date: December 8, 2008, 10:12 Category: Network Views: 5493 Comments
Tutorial quote: Nagios is a very powerful platform because it is easy to extend. A great feature that Nagios offers is the ability for third-party software or other Nagios instances to report information on the status of services or hosts. This way, Nagios does not need to schedule and run checks by itself, but other applications can report information as it is available to them. Nagios also offers a tool for sending passive check results for hosts and services over a network.

This chapter describes passive checks in detail. It gives practical examples of when and how they can be used. It also shows how to use NSCA (Nagios Service Check Acceptor)for sending notifications.
XenServer+Express

Virtualization With XenServer Express 5.0.0

Post date: October 14, 2008, 10:10 Category: Installing Views: 7730 Comments
Tutorial quote: This Howto covers the installation of XenServer Express 5.0.0 and the creation of virtual machines with the XenCenter administrator console. XenServer Express is the free virtualization platform from Citrix, the company behind the well known Xen virtualization engine. XenServer Express makes it easy to create, run and manage Xen virtual machines with the XenCenter administrator console. The XenServer Express installation CD contains a full Linux distribution which is customized to run XenServer Express.
Ubuntu

Installing Ubuntu From A Windows System With Wubi

Post date: September 11, 2007, 22:09 Category: Installing Views: 3713 Comments
Tutorial quote: Wubi is an Ubuntu installer for Windows that lets you install and uninstall Ubuntu from a Windows desktop. Wubi adds an entry to the Windows boot menu which allows you to run Linux. Ubuntu is installed within a file in the Windows file system (a loopmounted partition), this file is seen by Ubuntu as a real hard disk. That way the hard drive does not have to be repartitioned before the Ubuntu installation. The resulting Ubuntu installation is a "real" Linux system, not just a virtual machine. Wubi makes it easy for Linux newbies to play around with Ubuntu.
OpenSUSE

fdupes - Command line tool to find and list/delete duplicate files

Post date: October 28, 2008, 08:10 Category: Miscellaneous Views: 4524 Comments
Tutorial quote: fdupes is a simple Command Line utility to find and list duplicate files in the specified directories. fdupes can also delete the found duplicate files if instructed. fdupes can follow Symlinks and can be instructed to ignore hardlinks. fdupes can also show the size of the duplicate files. fdupes is a simple and very efficient tool, easy to use.
Debian

Creating a Wiki with kwiki

Post date: December 17, 2005, 22:12 Category: Software Views: 3212 Comments
Tutorial quote: Wikis are simple interactive websites which are extremely easy to use for storing easily updated text content. Using a Wiki you can easily create a lot of content with hyperlinks between them. Debian has packaged several different Wiki systems and here we'll look at installing just one of them: KWiki.

Wikis have become familiar to many people thanks to the popularity of large sites such as Wikipedia and can be very useful for creating collaborative websites.

Whilst there are many Wiki packages included in the Debian GNU/Linux distribution I've always had a soft spot for KWiki due to its simplicity, Perl nature, and low requirements.

Installing the software under Debian is very simple and we will show how to setup a new installation using the Debian Apache2 webserver package.
Linux

NFS over CIPE-VPN tunnels

Post date: May 23, 2005, 16:05 Category: Network Views: 3370 Comments
Tutorial quote: The Network File System (NFS) is a standard protocol for sharing file services with Linux and Unix computers. It is a distributed file system that enables local access to remote disks and file systems and is based on the client\server architecture. Although easy to configure, it is typically used only to transfer data over an intranet or LAN because of its transparency and security potholes when exposed to the risks of the Internet. However, it still can be employed -- without compromising security -- to share files over the Internet by configuring it to run on a Virtual Private Network (VPN) connection. This article will show you how to set up NFS to run over a CIPE-VPN connection between two Linux systems.
Linux

Automating the Login Script

Post date: April 17, 2005, 10:04 Category: Miscellaneous Views: 3003 Comments
Tutorial quote: In a perfect world, you could spend a few weeks creating a system and the result would be a system that never required manual maintenance or modifications. Whether this ideal will ever be achieved is debatable, but it definitely won't happen in the near future. In the meantime, we still have to do things manually, even if only once in a while. When I must do things manually, I'm not usually happy about it. In fact, it usually means that there has been an emergency, so other people aren't happy about it either. In times like this, it is nice to have a consistent and efficient user interface on every machine. The information and examples presented in this article assume that you are using the bash shell. However, you can modify all of the scripts so that they work in other shells. In some cases, they might even work unmodified (like in the standard Bourne Shell [sh]). Other shells will also work, but they might have different methods for changing the prompt and creating command aliases. The principles in this article should be relatively easy to adapt to the shell of your choice.
Unix+clones

Learn REXX fast

Post date: September 1, 2005, 01:09 Category: Programming Views: 3851 Comments
Tutorial quote: If you’ve programmed under IBM operating systems, you’ve undoubtedly heard of Rexx. Rexx is the scripting and command language IBM bundles with all its mainframe, mid-range, and lower-end operating systems. What you might not be aware of is that Rexx also runs on almost every other operating system in the known universe. You can download Rexx free for all versions of Windows®, Linux, UNIX®, BSD, Mac OS, and DOS, and many other systems. It even runs on the three major operating systems for handheld devices: Windows CE, Palm OS, and Symbian/EPOC32.

What this means is, if you learn Rexx, you’ll know a scripting language that runs everywhere from mainframes to handhelds—and everything in between. Rexx is a general-purpose language that's powerful enough for mainframes yet flexible enough for other platforms. Best of all, Rexx is easy to learn.
Debian

Intrusion Detection For PHP Applications With PHPIDS

Post date: June 24, 2008, 14:06 Category: Security Views: 5204 Comments
Tutorial quote: This tutorial explains how to set up PHPIDS on a web server with Apache2 and PHP5. PHPIDS (PHP-Intrusion Detection System) is a simple to use, well structured, fast and state-of-the-art security layer for your PHP based web application. The IDS neither strips, sanitizes nor filters any malicious input, it simply recognizes when an attacker tries to break your site and reacts in exactly the way you want it to. Based on a set of approved and heavily tested filter rules any attack is given a numerical impact rating which makes it easy to decide what kind of action should follow the hacking attempt. This could range from simple logging to sending out an emergency mail to the development team, displaying a warning message for the attacker or even ending the users session.
Web-based applications and online marketing solutions - LumoLink