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Linux

How to Avoid Getting Blacklisted

Post date: July 7, 2007, 23:07 Category: Security Views: 3634 Comments
Tutorial quote: A blacklist usually refers to a list of email or IP addresses known to send spam emails or some other type of unsolicited messages. Such lists are currently used by mail servers for filtering incoming emails and blocking the ones listed, in order to improve mail security and integrity. The blacklist is also the opposite of what is called a whitelist.
Linux

How To Patch BIND9 Against DNS Cache Poisoning (Debian/Fedora/CentOS)

Post date: July 29, 2008, 09:07 Category: Security Views: 3615 Comments
Tutorial quote: Dan Kaminsky earlier this month announced a massive, multi-vendor issue with DNS that could allow attackers to compromise any name server - clients, too. These two articles explain how you can fix a BIND9 nameserver on Debian Etch and Fedora/CentOS so that it is not vulnerable anymore to DNS cache poisoning.

http://www.howtoforge.com/how-to-patch-bind-to-avoid-cache-poisoning-debian-etch
http://www.howtoforge.com/how-to-patch-bind-to-avoid-cache-poisoning-fedora-centos
OpenSUSE

Measuring the performance/latency of OpenSuse system - LatencyTOP

Post date: February 17, 2009, 08:02 Category: Optimizing Views: 4839 Comments
Tutorial quote: Skipping audio, slower servers, everyone knows the symptoms of latency. But to know what's going on in the system, what's causing the latency, how to fix it... that's a hard question without good answers right now.

LatencyTOP is a Linux* tool for software developers (both kernel and userspace), aimed at identifying where in the system latency is happening, and what kind of operation/action is causing the latency to happen so that the code can be changed to avoid the worst latency hiccups.
Mepis

Upgrading to Linux from Windows 98

Post date: April 18, 2005, 07:04 Category: Miscellaneous Views: 6382 Comments
Tutorial quote: In this tutorial-style article, Michael C. Barnes outlines a strategy to avoid costly upgrades from Windows 98 to Windows XP -- in terms of both hardware and software -- by upgrading to Linux, instead. Barnes reviews the typical requirements of computers used for relatively generic purposes, and shows how to give a new lease on life to aging laptops and PCs by replacing obsolete OSes such as Windows 98 with a combination of Linux, free open source applications, and inexpensive commercial software.
Linux

Running ISPConfig On Port 80 Using Apache's Reverse Proxy Feature (Debian Etch)

Post date: May 23, 2007, 22:05 Category: System Views: 4593 Comments
Tutorial quote: 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.
Ubuntu

How to use apt-p2p For Faster Upgrades From Ubuntu 8.10 to 9.04

Post date: April 20, 2009, 07:04 Category: System Views: 3251 Comments
Tutorial quote: apt-p2p is a p2p proxy for apt dowloads, it will act as a proxy between apt requests and a repository server, downloading any request files from peers (if possible), else will fallback to direct HTTP download. In general, apt-p2p save bandwidth, use limited cpu and memory resources and reduce congestion on the ubuntu mirrors.apt-p2p will get the request files from peers, therefore, it will avoid the congestion on the ubuntu mirrors.

Unix+clones

CLI Magic: OpenSSH + Bash

Post date: January 25, 2006, 20:01 Category: Network Views: 2974 Comments
Tutorial quote: As a system administrator, I have used OpenSSH's piping abilities more times than I can remember. The typical ssh call gets me access to systems for administration with a proven identity, but ssh is capable of so much more. In combination with bash's subshell invocation, OpenSSH can distribute the heavy work, reduce trace interference on a system under test, and make other "impossible" tasks possible. I've even used it to make Microsoft Windows remote administration easier.

In the examples below, I have tried to avoid GNU-specific idioms for tools which have non-GNU counterparts. This practice improves portability of shell scripts in heterogeneous environments.
Linux

Building a Linux virtual server

Post date: June 9, 2005, 14:06 Category: Software Views: 2993 Comments
Tutorial quote: With the explosive growth of the Internet, the workload on servers providing Web, email, and media services has increased greatly. More and more sites are being challenged to keep up with the growing demands and are employing several techniques to avoid overloading their servers. Building a scalable server on a cluster of computers is one of the solutions that is being effectively put to use. With such a cluster, the increasing requests can be easily managed by simply adding one or more new servers to the existing cluster as required. In this article we will look at setting up one such scalable, network load-balancing server cluster using a virtual server via the Linux Virtual Server Project.
Debian

Installing memcached And The PHP5 memcache Module On Debian Etch (Apache2)

Post date: September 11, 2008, 11:09 Category: Optimizing Views: 6311 Comments
Tutorial quote: This guide explains how to install memcached and the PHP5 memcache module on a Debian Etch system with Apache2. memcached is a daemon that can store objects in the system's memory (e.g. results of database queries) which can speed up your web site tremendously. You can use memcached over a network (i.e., install your web application on one server and memcached on another server), but usually you install both on one server to avoid the networking overhead.
Web-based applications and online marketing solutions - LumoLink