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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CentOS Warning: RPMDB altered outside of yum

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Yum is an automatic updater and package installer/remover for rpm-based systems. It automatically computes dependencies and figures out what things should occur in order to safely install, remove, and update rpm packages. Yum also efficiently and easily retrieves information on any package installed or available in a repository to the installer.

When trying to update your server via the yum command you might see the following error / warning message:

Warning: RPMDB altered outside of yum.

Total download size: 28 k
Installed size: 53 k
Is this ok [y/N]: y
Downloading Packages:
nethogs-0.8.0-1.el6.x86_64.rpm | 28 kB 00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction

Warning: RPMDB altered outside of yum.

Installing : nethogs-0.8.0-1.el6.x86_64 1/1

Installed:
nethogs.x86_64 0:0.8.0-1.el6

Complete!

How do you fix this problem?

+George Rushby