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Apache: Creating A Session-Aware Loadbalancer Using mod_proxy_balancer (Debian Etch)
Since Apache 2.1, a new module called mod_proxy_balancer is available which lets you turn a system that has Apache installed into a loadbalancer. This loadbalancer retrieves requested pages from two or more backend webservers and delivers them to the user's computer. Users get the impression that they deal with just one server (the loadbalancer) when in fact there are multiple systems behind the loadbalancer that process the users' requests. By using a loadbalancer, you can lower the load average on your webservers. One important feature of mod_proxy_balancer is that it can keep track of sessions which means that a single user always deals with the same backend webserver. Most websites are database-driven nowadays with user logins etc., and you'd get weird results if a user logs in on one backend webserver, and then his next request goes to another backend webserver, meaning he'd get logged out again. You can avoid this by using mod_proxy_balancer's session-awareness.
nBox - Envision your network with nBox -- (Embedded Ntop)
The life of a systems or network administrator requires us to maintain an expansive understanding of our network infrastructure to more effectively manage it. Amidst volumes of complex data that some IT problems present and network management is no exception to these complications. Visual tools allow us to better see trends and make sense of the macro view of our networks. Ntop, nBox, nProbe are just the right FOSS tools that can help us gain greater insight.
Using Ruby On Rails With Apache2 On Debian Etch
This article shows how you can install Ruby on Rails (RoR) and integrate it in Apache2 on a Debian Etch system (including a short section at the end showing how to use RoR in a web site created with ISPConfig). Ruby on Rails is a web application framework which is rapidly gaining popularity among web programmers. It aims to increase the speed and ease with which database-driven web sites can be created and offers skeleton code frameworks (scaffolding) from the outset. Applications using the RoR framework are developed using the Model-View-Controller design pattern.
How to Configure OpenLDAP for the AXIGEN Mail Server
LDAP stands for Lightweight Directory Access Protocol. This protocol is used to access a directory listing. It is being implemented in Web browsers and e-mail programs to enable lookup queries (searches for certain types of information). When compared to other querying architectures such as SQL databases, lookup speed is the major advantage of using LDAP. In large companies, a huge number of requests are made and storing the information in a database becomes a very resource consuming approach. The basic principle behind LDAP is the optimization toward many record reads and few additions or modifications. From an administrator's point of view, LDAP is fairly easy to use as long as the concepts behind the system are understood. It is not the most user-friendly application to use, but the benefits it provides are worth the extra effort.
The Perfect Desktop - PCLinuxOS 2007
This tutorial shows how you can set up a PCLinuxOS 2007 desktop that is a full-fledged replacement for a Windows desktop, i.e. that has all the software that people need to do the things they do on their Windows desktops. The advantages are clear: you get a secure system without DRM restrictions that works even on old hardware, and the best thing is: all software comes free of charge. I found that PCLinuxOS is really easy to install and use, and it's a real alternative.
Running ISPConfig On Port 80 Using Apache's Reverse Proxy Feature (Debian Etch)
This article shows how you can configure a Debian Etch system that has the webhosting control panel ISPConfig installed so that ISPConfig can be accessed on port 80. By default ISPConfig uses port 81 which is a non-standard port and is blocked by some firewalls and ISPs. By using Apache's mod_proxy module, we can avoid this problem. It lets us create a reverse proxy that can fetch the pages from ISPConfig on port 81.
The Perfect Server - Mandriva 2007 Spring Free (Mandriva 2007.1)
This is a detailed description about how to set up a Mandriva 2007 Spring Free server that offers all services needed by ISPs and hosters: Apache web server (SSL-capable), Postfix mail server with SMTP-AUTH and TLS, BIND DNS server, Proftpd FTP server, MySQL server, Courier POP3/IMAP, Quota, Firewall, etc. This tutorial is written for the 32-bit version of Mandriva 2007 Spring, but should apply to the 64-bit version with very little modifications as well.
How to secure VNC remote access with two-factor authentication
VNC is the most popular remote access solution today. However, it was developed to provide remote access, not to provide secure remote access. Administrators have to add security to VNC by tunneling it through an encrpyted channel such as SSH and adding a layer of authentication. In this article, we will show you how to combine the NoMachine NX server to encrpyt VNC and remote X session combined with two-factor authentication from WiKID Systems to create a secure, fast remote access solution.
Beryl, Compiz, And Metisse - The 3D Desktop on Mandriva Linux 2007 Spring
After having included the AIGLX, Xgl and Compiz 3D desktop technologies in Mandriva Linux 2007, Mandriva has added all the latest 3D desktop updates in Mandriva Linux 2007 Spring, like Metisse and Beryl.
QoS And Traffic Shaping For VoIP Users Using iproute2 And Asterisk
The quality of my VoIP phone calls suffered whenever I was downloading or uploading anything. This was irritating, especially for those calling me (I heard them better than they heard me). So I poked at Iproute2 and other howtos, especially with regard to VoIP traffic, but I couldn't find anything that worked well. After some playing around, I've found settings that were right for me: consistant VoIP quality, regardless of any activities on the wire.