From OSSEC Wiki

Step-by-step installation guides

The following installation guides were written about ossec:

*A list of dependencies is available here.

• Installation videos by The Academy

• Building OSSEC - A Young Man’s Journey by Steve McMaster

• How to setup OSSEC on your Ubuntu box by Stephen Bunn

• Securing Your Server With A Host-based Intrusion Detection System by Falko Timme.

• OSSEC step-by-step installation on FreeBSD 6.1 and Windows by Peter Steevensz and Ruurd Bakker.

Non-english docs:

• Using OSSEC (from installation, configuration to the usage) By Rodrigo Montoro in Portuguese. part 2

• Installing OSSEC on Ubuntu by "ubuntu-br Security team" in Portuguese.

• Te gustaria saber que peligros rondan a tu(s) servidor(es)? by Guba in Spanish.

Please note that some of these documents were based on old versions of OSSEC.
Always make sure to download the latest version available here.