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How to Install and Configure iptables under CentOS

Working with iptables from the command line requires root privileges, so you will need to become root for most things we will be doing. Iptables should be installed by default on all CentOS 3.x, 4.x and 5.x installations. You can check to see if iptables is installed on your system by: $ rpm -q iptables [...]

How to convert a table from one storage engine to another in MySQL

 MySQL supports several storage engines that act as handlers for different table types. MySQL storage engines include both those that handle transaction-safe tables and those that handle non-transaction-safe tables: MyISAM manages non-transactional tables. It provides high-speed storage and retrieval, as well as fulltext searching capabilities. MyISAM is supported in all MySQL configurations, and is the default storage engine [...]

How to Improve MySQL Replication Performance

  As the number of slaves connecting to a master increases, the load, although minimal, also increases, as each slave uses up a client connection to the master. Also, as each slave must receive a full copy of the master binary log, the network load on the master may also increase and start to create [...]

Database Replication in MySQL – Step by Step Guide

Replication enables data from one MySQL database server (called the master) to be replicated to one or more MySQL database servers (slaves). Replication is asynchronous – your replication slaves do not need to be connected permanently to receive updates from the master, which means that updates can occur over long-distance connections and even temporary solutions [...]

How to configure Virtual Hosting using Apache 2 on Ubuntu

Virtual Hosting allow web servers to host more than one website on a sing machine. This is how sharing hosting works. I become pretty handy as well while develloping different web project on the same machine and allows you to access to your local repository using addresses such as http://dev.mysite.com instead of http://localhost/~myuser/myproject/ :) . [...]

How to configure xinetd package in fedora

 xinetd, the eXtended InterNET Daemon, is an open-source daemon which runs on many Linux and Unix systems and manages Internet-based connectivity. It offers a more secure extension to or version of inetd, the Internet daemon. xinetd performs the same function as inetd: it starts programs that provide Internet services. Instead of having such servers started [...]

How to Manage xinetd Programs

Many network enabled Linux applications don’t rely on themselves to provide restricted access or bind to a particular TCP port; instead they often offload a lot of this work to a program suite made just for this purpose, xinetd. The xinetd RPM is installed by default in Fedora Linux and uses /etc/xinetd.conf as its main [...]

How to Run quotacheck command

When each quota-enabled file system is remounted, the system is now capable of working with disk quotas. However, the file system itself is not yet ready to support quotas. To do this, you must first run quotacheck. The quotacheck command examines quota-enabled file systems, building a table of the current disk usage for each one. This table is [...]

How to install Zend Optimizer

The Zend Optimizer is a free runtime application that enables PHP to run the files encoded by the Zend Guard. This can be freely used by anyone looking to run encoded applications. Please download and follow the installation instructions included in the distributions. The simplest way to get a PHP runtime that includes Zend Optimizer [...]

How to Enable TCP/IP Forwarding in Windows XP

This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem [...]

An Introduction to Basic IPv4 Routing

All of the operations considered in this article are operations upon a router, whether that router is a Linux box or Cisco dedicated hardware or some other type of machine. In this chapter I consider the traditional methods of IPv4 routing as using static configurations that are manually input by the network administrator. 1.1 Traditional [...]

How to Install and Configure the eAccelerator PHP cache on Apache

If you are looking for a way to speed up your PHP pages on Apache, this is the software you want to install. Huge performance gains can be had when using this software to precompile and cache your PHP pages, and it is very simple to install.

How to Enable PEAR on OS-X XAMPP

The current, OS-X version of XAMPP comes with PEAR but it’s not installed/configured. Here is what you need to do: sudo su – [and type admin password] /Applications/xampp/xamppfiles/lib/php/pear install PEAR /Applications/xampp/xamppfiles/lib/php/pear install Log /Applications/xampp/xamppfiles/lib/php/pear list The last command outputs the list of installed pear modules. Log should be one of them. Once you configure pear [...]