Performance Tuning

OpenX

Disable automatic maintenance
In the Maintenance Settings, disable http://ads.example.com/www/admin/account-settings-maintenance.php, disable Automatically perform maintenance during delivery if scheduled maintenance is not set up and enable maintenance as a cron task:

cd /etc/cron.d
echo '0 * * * * root /usr/local/bin/php -f /var/websites/ads.example.com/htdocs/openx-2.8.7/maintenance/maintenance.php' > openx-maintenance
chmod 644 openx-maintenance
touch /etc/crontab

There's a variety of other ways to configure the cron task.
Disable debug logging
Uncheck the checkbox on

Store Images in a Directory, not the Database
Rather than having the ad files stored within the databse, create a directory to hold them:

cd /var/websites/ads.example.com/htdocs
mkdir ads
chown nobody:nobody ads

In Configuration -> Global Settings -> Banner Storage Settings, enable Allow Webserver Local Banners.
For the storing method, choose Local Directory and specify the Local Directory:

/var/websites/ads.example.com/htdocs/ads

Resources
Performance Tuning Techniques
OpenX Performance Tuning Tips
Openx Handbook Openx Server Optimization And Performance Tuning

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SquidGuard

SquidGuard is a URL redirector used to use blacklists with the proxysoftware Squid. There are two big advantages to squidguard: it is fast and it is free.
NCurses Disk Usage

A disk usage analyzer with an ncurses interface, aimed to be run on a remote server where you don't have an entire gaphical setup, but have to do with a simple SSH connection. ncdu aims to be fast, simple and easy to use, and should be able to run in any minimal POSIX-like environment with ncurses installed.
WPKG

WPKG is an automated software deployment, upgrade and removal program for Windows.

It can be used to push/pull software packages, such as Service Packs, hotfixes, or program installations from a central server (for example, Samba or Active Directory) to a number of workstations.

It can run as a service to install software in the background (silent install), without user interaction.

It can install MSI, InstallShield, PackagefortheWeb, Inno Setup, Nullsoft, other software installers or .exe packages, .bat and .cmd scripts and similar: no more repackaging to perform software installation.

WPKG is open source software.
opsi

opsi (Open PC Server Integration) the Open Source client management system
Vagrant

Vagrant is a tool for building complete development environments. With an easy-to-use workflow and focus on automation, Vagrant lowers development environment setup time, increases development/production parity, and makes the "works on my machine" excuse a relic of the past.

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