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Linux

TrueCrypt Tutorial: Truly Portable Data Encryption

Post date: July 2, 2007, 23:07 Category: Security Views: 3482 Comments
Tutorial quote: TrueCrypt is a free software that encrypts data on-the-fly. Right now the newest version released is version 4.3. You can create an encrypted hard drive, a separate partition or a directory with TrueCrypt. It does not simply encrypt the content of files, but their names and the names of the directories they are in as well. Moreover there is no way to check the size of the encrypted directory/HDD/partition. TrueCrypt is available for Windows and Linux.
Debian

How To Automatically Add A Disclaimer To Outgoing Emails With alterMIME (Postfix On Debian Etch)

Post date: January 8, 2008, 11:01 Category: Network Views: 9073 Comments
Tutorial quote: This tutorial shows how to install and use alterMIME. alterMIME is a tool that can automatically add a disclaimer to emails. In this article I will explain how to install it as a Postfix filter on Debian Etch.
Ubuntu

How to setup FreeNX server and Client in Ubuntu 8.10 (Intrepid)

Post date: April 13, 2009, 07:04 Category: Software Views: 3675 Comments
Tutorial quote: FreeNX is a system that allows you to access your desktop from another machine over the Internet. You can use this to login graphically to your desktop from a remote location. One example of its use would be to have a FreeNX server set up on your home computer, and graphically logging in to the home computer from your work computer, using a FreeNX client.

FreeBSD

Some Vexim / Exim customizations

Post date: September 26, 2009, 11:09 Category: Software Views: 6137 Comments
Tutorial quote: How to apply the following changes to a Vexim mail server setup:
* Disable saving of passwords in clear text
* Tag spam in subject, not only in headers
* SMTP, POP and IMAP over SSL (multiple certificates/hosts)
* Option to automatically move spam to subfolders
* A shell script that parses folders and does some mainteance
* A Roundcube plugin that allows the users to edit their Vexim settings directly from the webmail settings page
Debian

Installing Simple Invoices On Debian Etch

Post date: August 21, 2007, 23:08 Category: Installing Views: 3864 Comments
Tutorial quote: This tutorial describes how to install Simple Invoices on a Debian Etch server. Simple Invoices is a web-based, basic invoicing system that lets you create and manage your invoices, export them as PDF or Excel files, email them to your customers, etc. It is intended for small businesses/organizations and home users.
Gentoo

Tunneling the hard way: using slirp, pppd and socat

Post date: January 29, 2006, 13:01 Category: Network Views: 11232 Comments
Tutorial quote: Every now and then you might come across a "bad" ISP. The one I have at home for example is dropping UDP packets ever so often when I try to play online games -- and it tends to drop random packets while I try to log onto a gameserver too which makes a certain game I like to play crash during the loading phase so it can't recover. I also heard of other ISPs blocking certain ports on external servers -- universities for example seem to like blocking p2p network ports and the school i was attending till last august blocked everything but port 80 for http -- including ftp which made even on-topic "research" a pita at times.
Usually there's three ways of working around this problem if "giving up" is not an option to you: a) change your ISP, b) use ssh to redirect ports, c) connect to an external VPN to route for you. a) can be tricky -- it's impossible if you're sharing the link with your parents and they insist on their email addresses or in the university/workplace/school scenario. b) will only work with single port/host combinations and for c) you will need a full-fledged rootbox idling around on the internet -- which tend to be expensive and "virtual servers" might not work because those often don't include tun/tap devices and/or kernel-level ppp support if you rent them and in case you rented them you probably can't fiddle around with its kernel to enable it (that was my problem at least). If any of this rings a bell to you, read on and discover method d)
Ubuntu

Creating Snapshot Backups Of Your Desktop With TimeVault On Ubuntu 7.10

Post date: December 20, 2007, 12:12 Category: Miscellaneous Views: 3204 Comments
Tutorial quote: This document describes how to set up, configure and use TimeVault on Ubuntu 7.10. The resulting system provides a powerful backup system for desktop usage. TimeVault is a simple front-end for making snapshots of a set of directories. Snapshots are a copy of a directory structure or file at a certain point in time. Restore functionality is integrated into Nautilus - previous versions of a file or directory that has a snapshot can be accessed by examining the properties and selecting the 'Previous Versions' tab.
Unix+clones

Creating (and Maintaining) Perl Modules

Post date: May 1, 2005, 17:05 Category: Programming Views: 2983 Comments
Tutorial quote: The goal of this web page is to help you write easily maintainable and re-usable code. In Perl, re-usability is implemented through modules, which are similar to libraries in other languages.

This page will guide you through creating your module and documenting it, as well as giving you some tips on how to make your code as maintainable and re-usable as possible.
Ubuntu

Monitoring Network Latency With Smokeping (Ubuntu 9.04)

Post date: July 16, 2009, 11:07 Category: Installing Views: 7574 Comments
Tutorial quote: This guide shows how to install and configure Smokeping on Ubuntu 9.04 to monitor network latency. SmokePing is a deluxe latency measurement tool. It can measure, store and display latency, latency distribution and packet loss. SmokePing uses RRDtool to maintain a longterm data-store and to draw pretty graphs, giving up to the minute information on the state of each network connection.
Debian

Virtual Hosting With vsftpd And MySQL On Debian Etch

Post date: June 24, 2007, 23:06 Category: Installing Views: 3417 Comments
Tutorial quote: Vsftpd is one of the most secure and fastest FTP servers for Linux. Usually vsftpd is configured to work with system users. This document describes how to install a vsftpd server that uses virtual users from a MySQL database instead of real system users. This is much more performant and allows to have thousands of ftp users on a single machine.
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