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Introducing Remo - An Easy Way to Secure an Insecure Online Application with ModSecurity
Say you have a nasty application on your Apache webserver that has been installed by some jerks from the marketing department and you can neither remove nor patch it. Maybe it is a time problem, a lack of know-how, a lack of source-code, or possibly even political reasons. Consequently you need to protect it without touching it. There is ModSecurity, but they say this is only for experts. A straightforward alternative is Remo, a graphical rule editor for ModSecurity that comes with a whitelist approach. It has all you need to lock down the application.
Virtual Users And Domains With Postfix, Courier And MySQL (Debian Etch)
This document describes how to install a mail server based on Postfix that is based on virtual users and domains, i.e. users and domains that are in a MySQL database. I'll also demonstrate the installation and configuration of Courier (Courier-POP3, Courier-IMAP), so that Courier can authenticate against the same MySQL database Postfix uses.
How To Block Spam Before It Enters The Server (Postfix)
The last few weeks have seen a dramatic increase in spam (once again). Estimates say that spam makes now up for 80 - 90% of all emails, and many mail servers have difficulties in managing the additional load caused by the latest spam, and spam filters such as SpamAssassin do not recognize large parts of that spam as they did before. Fortunately, we can block a big amount of that spam at the MTA level, for example by using blacklists, running tests on the sender and recipient domains, etc. An additional benefit of doing this is that it lowers the load on the mail servers because the (resource-hungry) spamfilters have to look at less emails.
The Perfect Xen 3.1.0 Setup For Debian Etch (i386)
This tutorial provides step-by-step instructions on how to install Xen (version 3.1.0) on a Debian Etch (4.0) system (i386). Xen lets you create guest operating systems (*nix operating systems like Linux and FreeBSD), so called "virtual machines" or domUs, under a host operating system (dom0).
Using Xen you can separate your applications into different virtual
machines that are totally independent from each other (e.g. a virtual
machine for a mail server, a virtual machine for a high-traffic web
site, another virtual machine that serves your customers' web sites, a
virtual machine for DNS, etc.), but still use the same hardware.
The Perfect Desktop - Fedora 7
This tutorial shows how you can set up a Fedora 7 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.
The Perfect Server - CentOS 4.5 (32-bit)
This tutorial shows how to set up a CentOS 4.5 based server that offers all services needed by ISPs and web hosters: Apache web server (SSL-capable), Postfix mail server with SMTP-AUTH and TLS, BIND DNS server, Proftpd FTP server, MySQL server, Dovecot POP3/IMAP, Quota, Firewall, etc. This tutorial is written for the 32-bit version of CentOS 4.5, but should apply to the 64-bit version with very little modifications as well.
Retrieving Emails From Remote Servers With fetchmail (Debian Etch)
Fetchmail is a program for retrieving emails from remote servers. Imagine you have five email accounts on five different servers. Of course, you don't want to connect to each of them to get your emails. This is where fetchmail comes into play. If you have a user account on a Linux server, you can make fetchmail download emails from remote servers and put them into just one mailbox (the one of your Linux user), from where you can retrieve them with your email client (e.g. Thunderbird or Outlook).
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.