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Unix+clones

Bash tips and tricks

Post date: November 26, 2007, 05:11 Category: Software Views: 40519 Comments
Tutorial quote: For the uninitiated, bash is the default shell in many Linux distros, including Fedora, Ubuntu, Redhat etc etc. If you use a Linux based OS, then chances are that you are using bash. For this reason, I outline below a few common annoyances, and the simple ways to overcome them.
Debian

Running network services as a non-root user

Post date: April 20, 2006, 10:04 Category: Security Views: 3819 Comments
Tutorial quote: There are many times when it is convenient to allow non-root users to run services, or daemons, which bind to "privileged ports". There are several approaches to this problem each with its own set of pros and cons. Read on for a brief look at the most common approaches.
Debian

Updating multiple machines on low bandwidth

Post date: June 16, 2006, 21:06 Category: Network Views: 3512 Comments
Tutorial quote: There are situations where it is common to want to update multiple machines running Debian GNU/Linux whilst minimizing the bandwidth used for downloading packages and updates. There are several different solutions for this problem and here we'll look at one of them: apt-proxy.
eBox

Using eBox As A Gateway: Firewall, Traffic Shaping, HTTP Proxy And More

Post date: June 11, 2010, 12:06 Category: Installing Views: 6751 Comments
Tutorial quote: eBox Platform is the Linux small business server that allows you to manage all your network services like firewall, DHCP, DNS, VPN, proxy, IDS, mail, file and printer sharing, VoIP, IM and much more. These functionalities are tightly integrated, automating most tasks, avoiding mistakes and saving time for system administrators. This article will show you step by step how to use eBox as a Gateway, featuring network configuration, load balancing between two Internet connections with WAN failover and multigateway rules for policy routing, traffic shaping, DHCP and DNS cache for the LAN network and HTTP proxy with different content filtering policies and antivirus.
Unix+clones

Installing and securing Squid

Post date: March 13, 2006, 15:03 Category: Software Views: 5527 Comments
Tutorial quote: Squid is a high-performance proxy caching server for web clients, supporting FTP, gopher, and HTTP data objects. Unlike traditional caching software, Squid handles all requests in a single, non-blocking, I/O-driven process. Squid keeps meta data and especially hot objects cached in RAM, caches DNS lookups, supports non-blocking DNS lookups, and implements negative caching of failed requests. Squid supports SSL, extensive access controls, and full request logging. By using the lightweight Internet Cache Protocol, Squid caches can be arranged in a hierarchy or mesh for additional bandwidth savings.

After the installation and base configuration of squid we will add another layer of security by chrooting it.
Ubuntu

Newbie-Friendly Post-Installation Ubuntu Usability Setup Guide

Post date: November 5, 2009, 12:11 Category: Desktop Views: 4225 Comments
Tutorial quote: This tutorial is designed for new Linux users that are familiar with Microsoft Windows. The goal is to address some of the most common issues that these people face. (Namely, media codecs, and general terminology.) I tried to write it as someone might explain it vocally; I attempted to add humor in an effort to keep it interesting, although I make no guarantees that it is actually funny.
Unix+clones

Postfix performance tuning

Post date: May 21, 2005, 11:05 Category: Optimizing Views: 4090 Comments
Tutorial quote: Postfix is fast out of the box, but like other packages, you can usually tune it to work even faster. Furthermore, there are situations where Postfix may not perform as well as you expected, whether because of hardware or software limitations on the server system or other adverse conditions, such as a big influx of spam or undeliverable mail. This article shows you how to find and analyze the most common performance problems.
CentOS

Installing Xen On CentOS 5.2 (i386)

Post date: November 9, 2008, 12:11 Category: Installing Views: 5545 Comments
Tutorial quote: This tutorial provides step-by-step instructions on how to install Xen on a CentOS 5.2 system. 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. This saves money, and what is even more important, it's more secure. If the virtual machine of your DNS server gets hacked, it has no effect on your other virtual machines. Plus, you can move virtual machines from one Xen server to the next one.
Ubuntu

Transform Linux into a Talking Companion

Post date: November 24, 2007, 22:11 Category: Miscellaneous Views: 4916 Comments
Tutorial quote: Text-to-speech is really convenient, especially when you are lazy like me. Festival enables us to achieve a TTS system with limitless possibilities thanks to our Linux bash shell. I will show you some ways that we can use Festival as an enabler to our laziness and also produce some really cool and useful effects when coupling this technology with common things like PHP, cron, dnotify, or login scripts.
FreeBSD

My FreeBSD installation guide

Post date: November 6, 2006, 21:11 Category: Installing Views: 10078 Comments
Tutorial quote: This is a guide to installing FreeBSD, together with some very common applications (Apache webserver, MySQL, Courier-IMAP, Postfix, PHP, ISC-Dhcp server, CLAMAV antivirus (for e-mail), and much more.
Please inform author if you spot an error somewhere in his guide.
Guide is published under Creative Commons License 'Attribution-NonCommercial-ShareAlike 2.5'
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