To support and diagnose issues with OpenNMS the running configuration, settings and some system environment information are often required.
To support a CLI free way gathering information about a running OpenNMS instance you can use the “Generate System Report” functionality from the Web User Interface. For the reason it can contain security sensitive system specific information it is required the logged in user has a ROLE_ADMIN permission.
The report gives you very detailed information from the system environment, like Linux Kernel, Java version also stack traces.
In the zip compressed full output format you will also get configurations about open files and opennms log files.