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Linux

How to set up a mail server on a GNU / Linux system

Post date: February 7, 2006, 07:02 Category: Network Views: 4739 Comments
Tutorial quote: Easy to follow howto on setting up a mail server with unlimited users and domains, with IMAP/Pop access, anti-spam, anti-virus, secure authentication, encrypted traffic, web mail interface and more.

Based on an Ubuntu distribution platform, but instructions are distro generic.
Linux

Tools to delete files securely in GNU/Linux

Post date: January 5, 2009, 18:01 Category: Benchmarks Views: 7343 Comments
Tutorial quote: Deleting a file or reformatting a disk does not destroy your sensitive data. The data can easily be undeleted. That’s a good thing if you accidentally throw something away, but what if your trying to destroy financial data, bank account passwords, or classified company information. In this article you will learn number of tools(Shred,Wipe,srm,smem,sfill,sswap,DBAN) to delete files securely in GNU/ Linux

Debian

Little-known APT utilities for Debian desktop users

Post date: July 30, 2006, 18:07 Category: Desktop Views: 2624 Comments
Tutorial quote: The Advanced Packaging Tool (APT) is a distinguishing feature of Debian-based systems. APT was the first major alternative in GNU/Linux to boast automatic dependency resolution. Most GNU/Linux users know it through the apt-get command, a utility that calls on the lower-level dpkg command. However, other APT-based utilities remain largely unknown to desktop users. Some of these utilities offer a range of functionality far beyond those of the basic tools.
RedHat

Choosing an I/O Scheduler for Red Hat Enterprise Linux 4

Post date: July 18, 2005, 22:07 Category: Benchmarks Views: 7401 Comments
Tutorial quote: The Linux kernel, the core of the operating system, is responsible for controlling disk access by using kernel I/O scheduling. Red Hat Enterprise Linux 3 with a 2.4 kernel base uses a single, robust, general purpose I/O elevator. The 2.4 I/O scheduler has a reasonable number of tuning options by controlling the amount of time a request remains in an I/O queue before being serviced using the elvtune command. While Red Hat Enterprise Linux 3 offers most workloads excellent performance, it does not always provide the best I/O characteristics for the wide range of applications in use by Linux users these days. The I/O schedulers provided in Red Hat Enterprise Linux 4, embedded in the 2.6 kernel, have advanced the I/O capabilities of Linux significantly. With Red Hat Enterprise Linux 4, applications can now optimize the kernel I/O at boot time, by selecting one of four different I/O schedulers.
Debian

Setting up Subversion and websvn on Debian

Post date: September 18, 2006, 14:09 Category: Network Views: 6079 Comments
Tutorial quote: This howto will illustrate a way to install and configure Subversion and websvn on a Debian server with the following features:
- multiple repository Subversion
- access to the repositories via WebDAV (https, https) and ssh
- Linux system account access control and/or Apache level access control
- a secured websvn (php web application for easy code browsing)
- configured syntax coloring in websvn with gnu enscript
Ubuntu

Insights for a quick and easy Ubuntu printer installation

Post date: June 4, 2006, 18:06 Category: Hardware Views: 7093 Comments
Tutorial quote: Ubuntu makes printing reasonably easy and straightforward. This brief article is for those who need a specific and encouraging step-by-step guide. I hope that this article will not only ensure that you print with ease, but that you have every reason to enjoy a productive GNU/Linux desktop.

Before you begin the installation steps below, connect your printer/s. You need to do this prior to turning your system on. This helps to ensure Ubuntu recognizes how the printer is connected to the system, and it allows Ubuntu to identify the specific printer port.

Please don’t be dismayed if you plug in your printer and it’s not immediately recognized. I assure you that Ubuntu recognizes the printer. However, you will first need to configure the printer as an available device so other programs can use it.

The Ubuntu Printing Configuration Tool is used to accomplish this. For my example I will use an HP Deskjet printer connected to the Ubuntu system via a USB cable. However, these steps will also apply to printers that connect via a direct or Parallel cable.
Linux

Application optimization with compilers for Linux on POWER

Post date: May 23, 2005, 16:05 Category: Optimizing Views: 2710 Comments
Tutorial quote: The Linux on POWER platform offers more than one option to produce binary C/C++ code. In addition to supporting both 32- and 64-bit runtime environments simultaneously, Linux on POWER has two compiler collections. The GNU Compiler Collection, or GCC, is consistent with other Linux implementations with specific exceptions for the POWER architecture. GCC is the leading compiler for portability but also features a number of performance enhancements for optimizing code. The IBM XL C/C++ compiler for Linux on POWER is derived from the high performance compiler for AIX but uses the GNU linker and assembler to create ELF objects that are fully compatible with objects produced by GCC. This document provides side-by-side comparisons of how these two compilers are controlled, overviews of what the compilers are capable of, in terms of optimization, and tips for writing code that is more easily optimized with either of these compilers.
Debian

Installing and Configuring Exim4

Post date: February 25, 2006, 12:02 Category: Network Views: 3168 Comments
Tutorial quote: Installion of Exim4 from the latest Debian GNU/Linux packages is easy. The installation is now based around debconf. If you are upgrading from a simple Exim3 configuration, you can use exim_convert4r4 to convert your configuration file to the new format. If you used the previous version of this guide, which covered Exim3, the conversion should succeed without incident. I intend to discuss configuration via debconf, including setting up local delivery to Maildir format, handling local domain email, and configuring smarthosting for outbound email.
Debian

Cleaning up a Debian GNU/Linux system

Post date: November 25, 2006, 08:11 Category: System Views: 3366 Comments
Tutorial quote: You arrive at a Debian GNU/Linux server which has some history of neglection. Let's suppose someone else neglected it but if your new-year resolution is to stop neglecting your beloved server, this applies as well.

One form of neglection is to install, install, install and never un-install any package. The common utility to perform installation and un-installation of packages is apt-get which adds to the problem because it doesn't have automatic removal of non-needed dependences.

That means that when phpMyAdmin was installed it also installed Apache, PHP and ton of other packages. phpMyAdmin was removed when it was no longer needed but Apache, PHP and the ton of packages remain there.

Aptitude to the rescue.
Ubuntu

Ten tips for new Ubuntu users

Post date: June 22, 2006, 15:06 Category: Miscellaneous Views: 6169 Comments
Tutorial quote: Ubuntu has become the most popular Linux distribution for new Linux users. It's easy to install, easy to use, and usually "just works." But moving to a different operating system can be confusing, no matter how well-designed it is. Here's a list of tips that might save you some time while you're getting used to Ubuntu.
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