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Ubuntu

Install SugarCRM community edition in Ubuntu Intrepid Ibex Server

Post date: December 8, 2008, 22:12 Category: Software Views: 3541 Comments
Tutorial quote: SugarCRM is a complete CRM system for businesses of all sizes. Core CRM functionality includes sales force
automation, marketing campaigns, support cases, project management, calendaring, and more. It supports MySQL and
MS SQL Server.

Unix+clones

How to Set Up a Jabber Server

Post date: April 12, 2005, 16:04 Category: Software Views: 6441 Comments
Tutorial quote: Unless you have been living under a rock for the past few years, you must have heard about instant messaging and how it has changed the world of communications over the Internet. According to http://www.webopedia.com, Instant Messaging (IM) is a service that alerts users when their friends or colleagues are on line and allows them to communicate in real time through private online chat areas. Two of the most popular IM services are AOL Instant Messenger (AIM) and MSN Messenger. Unfortunately, most of the publicly available servers use proprietary protocols that only allow you to communicate with users on the same system. These systems are not compatible with each other and can't be accessed from other clients.

Jabber is an open source implementation of the IM server that aims to change this. It uses streaming XML protocols that are free, open, and public. These protocols have been formalized by the Internet Engineering Task Force (IETF) as the approved instant messaging and presence technology under the name of XMPP. The first Jabber technologies were developed in 1998 by Jeremie Miller and is now used on thousands of servers world-wide to enable millions of users to communicate with each other.

The biggest advantage of the Jabber server when compared with commercial IM servers is that, since it is open source, anyone can run a Jabber server and it can be restricted to a specific community like a company work force or a group of friends. In this article, I will document the steps I took to set up a Jabber server and how I managed to overcome the difficulties I faced. Hopefully this will make it easier for you to set up your own Jabber server.
Debian

Set Up A High-Availability Load Balancer With Perlbal/Heartbeat On Debian Etch

Post date: January 13, 2009, 12:01 Category: Installing Views: 3290 Comments
Tutorial quote: This article explains how to set up a two-node load balancer in an active/passive configuration with Perlbal 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. Perlbal 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

High-Availability Load Balancer With HAProxy/Wackamole/Spread On Debian Etch

Post date: January 6, 2009, 12:01 Category: Installing Views: 3602 Comments
Tutorial quote: This article explains how to set up a two-node load balancer in an active/passive configuration with HAProxy, Wackamole, and Spread 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 Wackamole and Spread, 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: 4494 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

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: 4690 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.).
Linux

Kernel parameters for enhance security

Post date: October 28, 2008, 05:10 Category: Security Views: 3187 Comments
Tutorial quote: The following list shows tunable kernel parameters you can use to secure your Linux server against attacks.

For each tunable kernel parameters you need to be add it to the /etc/sysctl.conf configuration file to make the change permanent after reboots
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: 3640 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

Enhancing kernel security with grsecurity

Post date: November 25, 2005, 21:11 Category: Security Views: 2871 Comments
Tutorial quote: Is your server as secure as it could be? Sure, you use a firewall, mandate strong passwords, and patch regularly. You even take a proactive approach by performing security audits with tools such as nmap and Nessus. Yet you may still be vulnerable to zero-day exploits and privilege escalation attacks. If these possibilities keep you awake at night, you're not alone. The sleepless folks with the grsecurity project have developed an easy-to-use set of security enhancements to help put your fears to rest.
Debian

How to set up an encrypted filesystem in several easy steps

Post date: December 10, 2006, 08:12 Category: Security Views: 3371 Comments
Tutorial quote: There's been a lot of talk lately about encrypted partitions, and Debian is proud to offer a feature to easily create them in the etch installer since beta3. But what about existing systems? This guide walks you through setting up an encrypted partition using cryptsetup and LUKS.
Web-based applications and online marketing solutions - LumoLink