Nagios Plugin Return Codes

Sometimes you want to write a simple script to check a few things and have this script work with Nagios.   Well, one of the 1st things you need to understand are the return codes.  Below are the basic return codes your script should return.

Read the following if you really want to start writing your own plugins.  Let me know know too and I will even test them.  Ref: http://nagiosplug.sourceforge.net/developer-guidelines.html

Numeric
Value

Services
Status

Status Description
0 OK Plugin executed and results are within parameters
1 WARNING Plugin executed and results are in warning range, or are not functioning properly
2 CRITICAL Plugin detected the service is not running, or the service is in the critical threshold
3 UNKNOWN Typically invalid check parameters, missing values, missing plugin components, etc.