Re-adding an interface to a node in OpenNMS

Question

Our OpenNMS was having an issue with "too many open files" and high CPU, and in the midst of the poor responsiveness decided to delete both IP interfaces from one of my nodes. Now that node has no interfaces in OpenNMS at all.

I've tried re-scanning the node but OpenNMS doesn't pick anything up. Does anyone know how to re-add the interface to the node? I'd rather not delete and re-add the node as that will remove all past history for that server.

I'm using a very old OpenNMS, version 16.0.3.

Thanks.

Answer 1

If your node as no interfaces at all, there is nothing to rescan, as OpenNMS has to have at least one interface available. It will start with that interface and attempt to access the SNMP ipAddrTable to discover more.

You have a couple of options:

1) If the node is provisiond (i.e. exists in a requisition) you can simply edit that requisition and add an interface back. Synchronize it should be back to normal.

2) If not, you'll need to rediscover the node. Make a note of the nodeid of the original node. When the new node is discovered, you can copy all of the files from $OPENNMS_HOME/share/rrd/snmp/[old nodeid] to $OPENNMS_HOME/share/rrd/snmp/[new nodeid]and that should preserve your data.