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I decided to write this little guide to provide the relatively simple steps needed to migrate your linux system to a Xen (HVM) virtual instance. It is assumed that on your source and destination boxes, that you only have one root “/” partition. If you partitioned out your file system differently, you will have to […]

This post is intended to be a general guide for configuring “stickied” load balanced HTTP servers. Whether it’s F5 load balancers, foundry load balancers or open source based load balancers (keepalived/lvs), the concepts are the same and can be migrated across said platforms. If you have a paid of foundry’s and are looking to configure […]

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Through our research and implementation of many Xen environments, it has become necessary to develop a reliable and secure method for backing up our Xen instances that are mounted on Logical Volumes (LVM).

There seems to be a lot of tutorials with respect to how you can dump/restore FreeBSD implementations. However, none of them appear to be all encompassing what is actually required from start to finish during the entire process.

The following command ssh’s to your remote server, tar + gzips a directory, and then outputs the compressed stream to your local machine.

The idea behind this script is to have a centralized, highly secure and restricted key repository server. Each server in your environment would run this script to “pull” the updated key list from the central server. The script would run as a cron job and can run as often as you like. Ideally every 5-10 minutes would allow for quick key updates / distribution.

I decided to post this article on implementing a simple single mail server with anti-spam and anti-virus capabilities.

This guide hopefully will help you on your way to configuring a basic mail system on Linux (specifically Debian).

Since this setup uses one FTP account to create user home directories and upload files, a compromise to this FTP user would cause the attacker to gain access to all FTP user home directories.