Welcome to the OpenNMS 20.1.0-1 installer! Before installation, make sure you've got PostgreSQL (9.1 or higher) and a Sun-compatible JDK (7 or higher) installed. To install OpenNMS 20.1.0-1 just run the installer as a user with administrator privileges from the command line: java -jar standalone-opennms-installer-20.1.0-1.jar For details on installation, please see: http://www.opennms.org/wiki/QuickStart