Housekeeping Tasks

This section describes housekeeping tasks that you may want to perform to ensure optimum system performance. We recommend that you complete some of these tasks before upgrading your Horizon instance.

Before upgrading

Prune unneeded events

Use vacuumd or cron to regularly prune unneeded events. This helps to clean up your events table, and reduces the amount of data in your backups. We also recommend doing this before you begin the Horizon upgrade process.

For example, run the following to delete events older than six weeks that have no associated outages:

DELETE FROM events WHERE NOT EXISTS
(SELECT svclosteventid FROM outages WHERE svclosteventid = events.eventid
UNION
SELECT svcregainedeventid FROM outages WHERE svcregainedeventid = events.eventid
UNION
SELECT eventid FROM notifications WHERE eventid = events.eventid)
AND eventtime < now() - interval '6 weeks';

After upgrading

Troubleshooting

If your Horizon instance fails to start after upgrading, you can run the Fix Karaf script to delete cached items. The script tries to fix configuration problems by pruning /opt/opennms/data and restoring all Karaf-related configuration files to a pristine state.

/opt/opennms/bin/fix-karaf-setup.sh

The Fix Karaf script can be destructive to files that may contain user-specific configuration settings. We recommend that you back up /opt/opennms/etc before running the script.