1.5. Preparing the Server Host Machine

On Linux, install the urw-fonts package. Java requires certain system fonts packages in order to label charts and graphs properly. If the urw-fonts package is not installed on Linux systems, then the monitoring graphics cannot be rendered.

Synchronize machine clocks. All JBoss ON servers and agents must have synchronized clocks. Clock variations cause issues in availability reporting, metric measurements, graphing, and even identifying and importing resources into inventory. The Network Time Protocol project, http://www.ntp.org/, has information on installing and configuring NTP to ensure your clocks are synchronized.

Configure DNS. Both forward and reverse DNS mapping entries must be present for all hosts involved in monitoring. This includes all JBoss ON servers and all machines running agents.

Configure the firewall to allow communication over the server and agent ports. Ensure the necessary ports have been opened to prevent the firewall from blocking the JBoss ON server and agents from communicating. The JBoss ON server typically uses port 7080, and the JBoss ON agents typically use port 16163.