ZABBIX is a 24×7 monitoring solution without high cost.

ZABBIX is software that monitors numerous parameters of a network and the health and integrity of servers. ZABBIX uses a flexible notification mechanism that allows users to configure e-mail based alerts for virtually any event. This allows a fast reaction to server problems. ZABBIX offers excellent reporting and data visualisation features based on the stored data. This makes ZABBIX ideal for capacity planning.

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From DebianHelp:

Nagios® is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. It has been designed to run under the Linux operating system, but works fine under most *NIX variants as well. The monitoring daemon runs intermittent checks on hosts and services you specify using external "plugins" which return status information to Nagios. When problems are encountered, the daemon can send notifications out to administrative contacts in a variety of different ways (email, instant message, SMS, etc.). Current status information, historical logs, and reports can all be accessed via a web browser.

Read the full thing at http://www.debianhelp.co.uk/oreon1.3.htm

From Howtoforge.com:

THE DEFINITIVE GUIDE TO SETTING UP A LINUX RELAY SERVER FOR MICROSOFT EXCHANGE SERVER 2000/2003

There are a couple of linux how-tos floating on the Internet that deal with this very subject. As a matter of fact, those guides are what inspired to write this one. In the spirit of keeping it simple, let me recommend the Mandrake or as it’s currently known Mandriva Linux distro. This guide has been written with this distro in mind.

Read the full Mandriva Howto

From Howtoforge:

This tutorial shows how to install and use suPHP with PHP4 and PHP5. suPHP is a tool for executing PHP scripts with the permissions of their owners instead of the Apache user. With the help of suPHP you can also have PHP4 and PHP5 installed at the same time which I will describe at the end of this article.

Read the full thing at http://www.howtoforge.com/apache2_suphp_php4_php5

From Linux.com:

The auto complete feature of the Bourne Again SHell makes bash one of the most loved and newbie-friendly Linux shells. Just by pressing the Tab key you can complete commands and filenames. Press the Tab key twice and all files in the directory get displayed. But you can do more with autocomplete -- such as associating file types with applications, and automatically designating whether you're looking for directories, text, or MP3 files. With simple commands such as complete and the use of Escape sequences, you can save time and have fun on the command line.

Read the full thing at http://www.linux.com/article.pl?sid=06/04/28/1447222

From Linux.com:

Creating and reading PDF files in Linux is easy, but manipulating existing PDF files is a little trickier. Countless applications enable you to fiddle with PDFs, but it's hard to find a single application that does everything. The PDF Toolkit (pdftk) claims to be that all-in-one solution. It's the closest thing to Adobe Acrobat that I've found for Linux.

Read the full thing at http://www.linux.com/article.pl?sid=06/04/17/1943230

From HowtoForge:

This tutorial shows how you can mirror your web site from your main web server to a backup server that can take over if the main server fails. We use the tool rsync for this, and we make it run through a cron job that checks every x minutes if there is something to update on the mirror. Thus your backup server should usually be up to date if it has to take over.

Read the full thing at http://www.howtoforge.com/mirroring_with_rsync

From Linux.com:

Nagios, the premier open source network monitoring program, is celebrating its 2.1 release. With four years of development under its belt, Nagios is powerful enough to replace expensive proprietary monitoring products and become a tool your organization can't live without.

Read the full thing at http://www.linux.com/article.pl?sid=06/03/31/2050238

From Howtoforge:

This tutorial shows you how to configure BIND9 DNS server to serve an internal network and an external network at the same time with different set of information. To accomplish that goal, a new feature of BIND9 called view is used. As a tutorial it'll walk you through the whole set up, but initial knowledge of BIND and DNS is required, there are plenty of documents that cover that information on the Internet.

Read the full thing at http://www.howtoforge.com/two_in_one_dns_bind9_views

From O'Reilly SysAdmin:

Employee turnover in most organizations runs high. So unless you run a small shop with a stable user base, you need to learn how to clean up after an employee leaves. Too many so-called system administrators do not understand the stakes involved when they manage users. Disgruntled former employees can often cause significant trouble for a company by gaining access to the network.

Read the full thing at http://www.oreillynet.com/sysadmin/blog/2006/03/howto_remove_an_user_and_impro.html