Nagios, 2nd Edition

7.6 Keeping Tabs on the Number of Logged-In Users

The plugin check_users is used to monitor the number of logged-in users:

user@linux:nagios/libexec$ ./check_users -w 5 -c 10
USERS CRITICAL - 20 users currently logged in |users=20;5;10;0

It has just two options:

-w number / --warning=number

This is the threshold for the number of logged-in users after which the plugin should give a warning.

-c number / --critical=number

This is the threshold for a critical state, measured by the number of logged-in users.

The performance data after the | is as usual visible only on the command line; Nagios does not include it in the Web interface.