Owl Monitoring System Manager Installation Manual

6. Changing Queries on Existing Owl Sensors

	6.1.		Adding New Queries
	6.2.		Deleting Old Queries

From time to time, you might decide to change the queries being performed by the Owl sensors. This could be adding new queries to some or all of the sensors, stopping some of the queries from being performed, or modifying existing queries. Regardless of the changes, there are actions that must be taken on the Owl manager and all affected Owl sensors.

6.1. Adding New Queries

Adding new queries to the Owl manager is a matter of informing Nagios that it should report on new data. This is accomplished by adding new Nagios objects for the sensor. The following actions must be performed:

1. Wait for the query changes to take place in the Owl sensor. You will know this has happened when new sensor data files start appearing in the sensor's data directory, if you are adding queries, or fewer data files are arriving, if you are removing queries.

2. Build new Nagios objects for the new queries' data files. This may be most simply accomplished by rerunning owl-newsensor for the affected sensor. This will rebuild all the sensor's Nagios objects, so you must take this into account if you have made manual changes to the object file. See section 4.7 and section 4.8 for more information on creating new Nagios objects.

3. Perform the actions in section 4.10. in order to restart Nagios.

4. With sensor query data arriving, you might want to consider modifying your graphs to display the changes in sensor data. See section 5 for information on defining graphs.

6.2. Deleting Old Queries

Deleting existing queries to the Owl manager is a matter of informing Nagios that it should stop reporting on existing data. This is accomplished by deleting Nagios objects for the sensor. The following actions must be performed:

1. Edit the Nagios object files to delete the objects for the unwanted queries. See section 4.7 and section 4.8 for more information on Nagios objects.

2. Perform the actions in section 4.10 in order to restart Nagios.