Community Support


Knowledge Base Find or create articles to solve specific known problems or instructions how to diagnose problems with OpenNMS and it’s components.
Topic Replies Activity
FortiGate 5.6.X OpenNMS asset population 2 November 7, 2019
Migration of JVM settings from Oracle JDK 8 to OpenJDK 11 3 November 6, 2019
Crash when Netflow 5 Adapter is not found in Telemetryd after upgrade 2 October 25, 2019
How to ask good questions

You run into a problem or you just can’t figure out how things work. This is where you want to start asking people in our community for help. Here are some guidelines on how to ask good questions where people are more w…

2 November 5, 2019
Upgrading PostgreSQL

Since OpenNMS Horizon 25 has a new requirement of PostgreSQL 10 or higher, it’s likely many of you are needing to look into how to go about upgrading it. Here is a short tutorial on what you need to do. NOTE: This tuto…

10 October 15, 2019
What is the difference between Minion and Remote Poller? 3 October 13, 2019
Sizing Cassandra for Newts 1 October 7, 2019
Datasources passwords in cleartext 3 October 7, 2019
Install an older version of OpenNMS Horizon 1 May 3, 2019
How to use NGINX as SSL Proxy with OpenNMS Horizon 5 September 17, 2019
WinRM in OpenNMS 1 August 28, 2019
:biohazard: Docker and Kernel Panic on Ubuntu 18.04 with kernel 4.15.0-60 5 September 12, 2019
Forwarding alarms northbound via Syslog messages and SNMP traps 3 September 6, 2019
Installing OpenNMS fails with ClassNotFoundException: com.sun.tools.attach.AttachNotSupportedException 1 December 7, 2018
Ensure time synchronization for your OpenNMS components 1 January 31, 2019
Troubleshoot data collections problems 1 December 12, 2018
SNMP traps - UI displays IP address varbinds in hex? 8 July 30, 2019
Web UI is not accessible with HTTP ERROR 503 after upgrade 5 July 25, 2019
Why node interfaces are getting deleted 5 July 22, 2019
Troubleshoot threshold configuration issues 2 July 18, 2019
OpenNMS doesn't start with systemd after installing on Ubuntu/Debian 1 May 10, 2019
Opennms webapp startup failure due to unresolved symlinks 1 April 18, 2019
Karaf CLI Cheat sheet 1 January 26, 2019
Why is a service in state not monitored? 1 June 6, 2019
How are node labels determined? 1 June 6, 2019
30 seconds outage 1 June 6, 2019
Dealing with Java Environments on CentOS and Ubuntu 1 May 8, 2019
Importing Nodes From Netbox via PRIS 1 June 5, 2019
Monitor operating system updates 1 June 5, 2019
Monitor required operating system restarts 1 June 5, 2019