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How to filter spam with Spamassassin and Postfix in Debian

Post date: April 20, 2008, 18:04 Category: Network Views: 3436 Comments
Tutorial quote: We have already discussed how to install mail server with postfix+Devcot+SASL +Squirrel Mail in this article we will see how to add spam filter for postfix mail server.Apache SpamAssassin is an extensible email filter that is used to identify spam. Once identified, the mail can then be optionally tagged as spam for later filtering. It provides a command line tool to perform filtering, a client-server system to filter large volumes of mail, and Mail::SpamAssassin, a set of Perl modules allowing Apache
SpamAssassin to be used in a wide variety of email systems.


The PartImage Handbook

Post date: May 21, 2005, 15:05 Category: Software Views: 2510 Comments
Tutorial quote: - Partition Image is a Linux/UNIX partition imaging utility: it saves partitions formatted using the Ext2FS (the linux standard), ReiserFS (a new journaled and powerful file system), JFS IBM journaled file systems from AIX, NTFS (Windows NT File System), FAT16/32 (DOS & Windows file systems), or HPFS (OS/2 file system) file system formats to an image file. Only used blocks are copied. The image file can be compressed in the GZIP/BZIP2 formats to save disk space, and split into multiple files to be copied on removable media (ZIP for example), or burned on a CD-R ...

- This allows the user to save a full Linux/Windows system, with a single operation. When problems occur (viruses, crash, error, ...), you just have to restore, and after several minutes, all your system is restored (boot, files, ...), and fully working.

- This is very useful when installing the same software on many machines: just install one of them, create an image, and then restore the image on all other machines. After the first one, each subsequent installation can be made automaticaly, and only requires a few minutes.

Benchmark: Apache2 vs. Lighttpd (Static HTML Files)

Post date: September 21, 2008, 12:09 Category: Benchmarks Views: 5674 Comments
Tutorial quote: This benchmark shows how Apache2 (version 2.2.3) and lighttpd (version 1.4.13) perform compared to each other when delivering a static HTML file (about 50KB in size). This benchmark was created with the help of ab (Apache benchmark) on a VMware vm (Debian Etch); if you try this yourself, your numbers might differ (depending on your hardware), but the tendency should be the same.

Rebuilding the OpenBSD kernel

Post date: April 24, 2005, 20:04 Category: System Views: 4068 Comments
Tutorial quote: Users who want their OpenBSD machine to perform specific functions or need additional device drivers might want to customize their kernel. In other OS's, like some types of Linux, it is very popular to rebuild the kernel because the default is so bloated. For most users, the default OpenBSD kernel is sufficient; however, you should still apply kernel patches, which will require rebuilding and installing a fresh kernel.

Getting started with RHEL4's built-in LVM tools

Post date: June 3, 2005, 16:06 Category: System Views: 6038 Comments
Tutorial quote: Many Unix administrators I know (you know who you are), always used to smirk when I talked about Linux. They could always point to the fact that regardless of whatever I could say, they had journaling file systems, which they could manage using various Logical Volume Management (LVM) tools, and I couldn't touch that.

Well, not any more! Not only does Red Hat offer ext3 as their default file system, but they offer great management tools to boot. As we know, ext2 had a great lifespan, but it was not an enterprise-ready file system that could handle large disk partitions, fast recovery from systems crashes, or large amounts of files. Journaling file systems give you the ability to recover almost instantly from a crash, as you do not need to run fsck after a restart. Similar to how databases recover from crashes, a journaling file system tracks changes to file system metadata and pretty much guarantees that either all or no updates have completed. Of course, these file systems also need elaborate tools to help better configure and manage them accordingly.

SongBird - free iTunes like Media player and web browser

Post date: September 12, 2008, 22:09 Category: Multimedia Views: 3326 Comments
Tutorial quote: Songbird is a free opensource customizable media player and web browse powered by Mozilla. Songbird runs on Mozilla’s XULRunner platform, thus capable of running on Microsoft Windows, Apple Mac OS X, Solaris and Linux. On the Windows and Macintosh platforms, Songbird utilizes the VideoLAN Client for media playback.

GNOME Do - Launcher tool to search and launch applications files and more

Post date: October 21, 2008, 22:10 Category: Desktop Views: 3381 Comments
Tutorial quote: GNOME Do (Do) is an intelligent launcher tool that makes performing common tasks on your computer simple and efficient. “GNOME Do” not only allows you to search for items in your desktop environment (e.g. applications, contacts, bookmarks, files, music), it also allows you to specify actions to perform on search results (e.g. run, open, email, chat, play).

Cleaning up a Debian GNU/Linux system

Post date: November 25, 2006, 08:11 Category: System Views: 3371 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.

Installing Dansguardian With Multi-Group Filtering & Squid With NTLM Auth (Debian Etch)

Post date: July 17, 2008, 10:07 Category: Installing Views: 4319 Comments
Tutorial quote: This how-to describes how to install and configure Dansguardian with multi-group filtering, Squid with NTLM auth, ipmasq, and dnsmasq to provide a full internet gateway solution for small to medium sized networks. This how-to requires two NICs in order to perform firewalling and transparent proxying.

Upgrade Your Desktop From Fedora 8 To Fedora 9 With PreUpgrade

Post date: May 20, 2008, 05:05 Category: Desktop Views: 2767 Comments
Tutorial quote: This document describes how to upgrade your desktop from Fedora 8 to Fedora 9 via PreUpgrade. PreUpgrade provides a frontend that allows the user to easily download all packages that are needed for the distribution upgrade, and then perform the distribution upgrade.
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