There are always various ways to install software and the OpenNMS website provides several good tutorials at http://www.opennms.org/wiki/Tutorial for various operating systems. The following steps provide a less detailed albeit, slightly more advanced, and secure deployment procedure.
OpenNMS is a large and complex piece of software and its deployment can be intimidating. Making sure we are prepared will save us a lot of trouble along the road. Here are some of the things needed before getting started: