Monitoring via SNMP

In addition to using NRPE to collect data, Nagios can also collect data via SNMP (Simple Network Management Protocol). This is especially useful for monitoring network equipment like routers and switches, which often have SNMP agents built into them.

How to do it...

1. Install the Nagios SNMP plugins:

   sudo apt-get install nagios-snmp-plugins
   

2. Define some SNMP checks using SNMPv2:

   define hostgroup {
           hostgroup_name snmp-hosts
   }
   
   define service {
           hostgroup_name                  snmp-hosts
           service_description             Load Average
           check_command                   \ check_snmp_load_v2!netsc!30!40!!public
           use                             generic-service
           notification_interval           0
   }
   
   define service {
           hostgroup_name                  snmp-hosts
           service_description             Interface Status
           check_command                   \ check_snmp_int_v2!!!public
           use                             generic-service...