Check SNMP Uptime

I understand this is 8 years old and there might be better alternatives people are using already, but in 2019 this was one of the first plugins that came up for a search of "nagios snmp uptime" so thought it was worth commenting on.

Maybe it was the author's intention, but by using snmpEngineUptime instead of sysUpTime this plugin does not check the uptime of the OS/device, it checks the uptime of the SNMP daemon so it will show a different time if eg. snmpd has been restarted at any point.

[root@server1 nagios]# ./check_snmp -H server2 -C public -o snmpEngineTime.0 -P 2c
SNMP OK - 958 seconds | SNMP-FRAMEWORK-MIB::snmpEngineTime.0=958

[root@server1 nagios]# ./check_snmp -H server2 -C public -o sysUpTime.0 -P 2c
SNMP OK - 96767 | DISMAN-EVENT-MIB::sysUpTimeInstance=96767

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My "commands.cfg" file.
define command{
command_name check_snmp_uptime
command_line /usr/local/nagios/libexec/check_snmp_uptime.pl -H $HOSTADDRESS$ -C "$ARG1$"
}
#####################################
My "Linux.cfg" file
define service{
use generic-service
host_name cPanel
service_description UPTIME
check_command check_snmp_uptime!public
}
#######################
commands output:
/usr/local/nagios/libexec/check_snmp_uptime.pl -H 192.168.1.1 -C public

SNMP uptime: 35 days, 0 hours, 12 minutes, 21 seconds : OK
#######################

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This was exactly what I needed! Nice job! =)

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