CentOS 6 NTP Server

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It is important for systems administrators to make sure that mission-critical servers are always using the correct system time.

The ntpd (Network Time Protocol daemon) program is an operating system daemon which sets and maintains the system time of day in synchronism with Internet standard time servers. Make sure that the time zone configuration of your computer is correct. ntpd itself does not do anything about the time zones, it just uses UTC internally.
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Install Varnish CentOS 6

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This tutorial is intended for system administrators wanting to install Varnish on CentOS 6. The reader should know how to configure a web server or application server and have basic knowledge of the HTTP protocol. Once finished the reader should have a basic Varnish cache up and running with the default configuration.

Varnish is a web application accelerator. You install it in front of your web application and it will speed it up significantly.

Varnish web application accelerator homepage: https://www.varnish-cache.org
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CentOS 6 Puppet Install

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In this tutorial we’ll be covering the very basics of installing and configuring Puppet. Puppet is a system for automating system administration tasks. Its automation saves you countless hours of frustration, monotony and reinventing the wheel. It lets you perform administrative task from a central systems to any number of systems running any variant of operating system.

For a more complete description visit Puppet Labs.
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Install Percona XtraDB Cluster on CentOS 6.2

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Percona XtraDB Cluster is a new high availability and high scalability solution for MySQL users. XtraDB Cluster integrates Percona Server with the Galera library of high availability solutions in a single product package. Percona XtraDB is an enhanced version of the InnoDB storage engine for MySQL and MariaDB. It has much faster performance than InnoDB and better scalability on modern hardware.
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