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Debian

Setting Up A High-Availability Load Balancer (With Failover and Session Support) With HAProxy/Keepalived On Debian Etch

Post date: October 29, 2007, 09:10 Category: Network Views: 4691 Comments
Tutorial quote: This article explains how to set up a two-node load balancer in an active/passive configuration with HAProxy and keepalived on Debian Etch. The load balancer sits between the user and two (or more) backend Apache web servers that hold the same content. Not only does the load balancer distribute the requests to the two backend Apache servers, it also checks the health of the backend servers. If one of them is down, all requests will automatically be redirected to the remaining backend server. In addition to that, the two load balancer nodes monitor each other using keepalived, and if the master fails, the slave becomes the master, which means the users will not notice any disruption of the service. HAProxy is session-aware, which means you can use it with any web application that makes use of sessions (such as forums, shopping carts, etc.).
Debian

Setting Up A High-Availability Load Balancer (With Failover and Session Support) With HAProxy/Heartbeat On Debian Etch

Post date: November 7, 2007, 11:11 Category: Network Views: 4499 Comments
Tutorial quote: This article explains how to set up a two-node load balancer in an active/passive configuration with HAProxy and heartbeat on Debian Etch. The load balancer sits between the user and two (or more) backend Apache web servers that hold the same content. Not only does the load balancer distribute the requests to the two backend Apache servers, it also checks the health of the backend servers. If one of them is down, all requests will automatically be redirected to the remaining backend server. In addition to that, the two load balancer nodes monitor each other using heartbeat, and if the master fails, the slave becomes the master, which means the users will not notice any disruption of the service. HAProxy is session-aware, which means you can use it with any web application that makes use of sessions (such as forums, shopping carts, etc.).
Debian

Protect Your Files With TrueCrypt 5.1a On Debian Etch (GNOME)

Post date: May 13, 2008, 10:05 Category: Desktop Views: 3210 Comments
Tutorial quote: This document describes how to set up TrueCrypt 5.1a on Debian Etch (GNOME). Taken from the TrueCrypt page: "TrueCrypt is a software system for establishing and maintaining an on-the-fly-encrypted volume (data storage device). On-the-fly encryption means that data are automatically encrypted or decrypted right before they are loaded or saved, without any user intervention. No data stored on an encrypted volume can be read (decrypted) without using the correct password/keyfile(s) or correct encryption keys. Entire file system is encrypted (e.g., file names, folder names, contents of every file, free space, meta data, etc)."
Debian

Upgrading Debian Etch (Stable) to Lenny (Testing)

Post date: October 3, 2008, 03:10 Category: System Views: 2856 Comments
Tutorial quote: Lenny is updated everyday with the most recent software available, however the software may not be stable which is what Debian is really all about. However if like me you can’t stand the thought of having outdated software, heres how to upgrade.
Debian

Installing Xen 3.0 upon Debian Unstable, with a custom Kernel

Post date: December 29, 2005, 07:12 Category: System Views: 3526 Comments
Tutorial quote: Recently we demonstrated the process of installing a binary release of Xen 3.0 on Sarge, since the packages on Debian Unstable are not yet available for Xen 3.0 we're now going to look at installing it via the packages provided by Ralph Passgang. This also includes building a custom Xen kernel from source.

The advantage to building the Xen kernel from source is that you can add, or remove, drivers - so the kernel is utterly customised for your system.
Debian

How To Enable Multiple HTTPS Sites For One IP On Debian Etch Using TLS Extensions

Post date: November 19, 2007, 11:11 Category: Software Views: 3644 Comments
Tutorial quote: This guide is Debian specific but could be ported to other distributions since the concept is the same. In order to use TLS Extensions we have to patch and recompile Apache2 and recompile OpenSSL with the enable-tlsext directive. Since TLS extensions are relatively new, some Internet browsers will not work so the Apache2 server will deliver just the default site as http 1.0 does on an http 1.1 server.
Linux

How To Set Up VMware Tools On Various Linux Distributions

Post date: October 2, 2007, 07:10 Category: Miscellaneous Views: 7994 Comments
Tutorial quote: This document explains how to set up the VMware Tools in the following guest operating systems: Ubuntu 7.04, Fedora 7, PCLinuxOS 2007 and Debian Etch. Installing VMware Tools in your guest operating systems will help maximize performance, provide mouse synchronization and copy & paste functionality. This article also shows a way of making VMware Tools start automatically when you start a guest operating system.
Debian

Creating a Wiki with kwiki

Post date: December 17, 2005, 22:12 Category: Software Views: 2722 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.
Fedora+Core

Set Up A Fedora 7 Mail Server Using Qmail Toaster

Post date: June 20, 2007, 23:06 Category: Installing Views: 8123 Comments
Tutorial quote: This document describes how to install a Fedora 7 mail server based on Qmail using Qmail Toaster. Qmail is an Internet Mail Transfer Agent (MTA) for UNIX-like operating systems. It is a drop-in replacement for the Sendmail system provided with UNIX operating systems. Qmail uses the Simple Mail Transfer Protocol (SMTP) to exchange messages with MTAs on other systems.
Linux

Delete Qmail Server messages Queue

Post date: January 12, 2007, 18:01 Category: Software Views: 2735 Comments
Tutorial quote: qmail is a mail transfer agent that runs on Unix. It was more secure replacement for the popular Sendmail program. The author offered a $500 prize for the first person to publish a verifiable security hole in the latest version of the software.

This is a useful thing to do in a number of situations. For instance, if you are hit with a spamming attack, you can temporarily instate a second Qmail installation (once the spam run is finished), allow it to take over mail receipt,and then use this tool to clean the offending mails out of the queue before switching over to the main Qmail installation once again.
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