Essential SNMP, 2nd Edition

OpenNMS

This web-based management solution focuses on three main areas: polling, performance, and event management. It leverages some other important open source packages, including RRDtool, Tomcat, and Curl (to name a few).

All of the images and screenshots in this section can be found at the OpenNMS web site located at http://www.opennms.org.

Figure G-4 shows the main OpenNMS web interface screen. This is the starting area, providing a high-level view into which areas of the network, if any, are experiencing outages. It also serves as a launching area for a variety of reports.

Figure G-4. OpenNMS—main web console screen

One nice feature that OpenNMS provides is notification escalations. Users state that they want to be notified about certain events. When the event occurs, an alert is sent out and the event is set as "outstanding." The user can then log in to the web interface and acknowledge that particular event. If after some (preset) time, the user does not acknowledge the event, OpenNMS escalates the event to another user or group.

Events are displayed in a table format, as shown in Figure G-5. Checkboxes make it easy to acknowledge an event. Admins can raise or lower an event's severity or drill down into more detail about the event.

Reports are displayed in the typical RRDtool fashion (as shown in Figure G-6). There's a report search section that you can use to find reports ...