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DuckReconMajor
Asked: 2020-05-20 06:27:02 +0800 CST

How to change Nagios check_snmp configuration to use SNMP v3

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I posted this on SuperUser but I realized this question is probably more relevant here.

I am trying to check uptime via Nagios's check_snmp plugin on a SNMP version 3 enabled UPS.

I'm able to do an snmpget call specifying version 3 with the proper credentials and get the proper response back from the UPS, so I know it's set up correctly there.

The nagios check_snmp plugin documentation shows it has options supporting v3.

However within Nagios configuration files, the only examples I find show "-C public"

I can't find within the nagios configuration files where to specify version 3 to the check_snmp plugin, whether it's in the host configuration file, the commands.cfg, or somewhere else entirely.

I've tried replacing "-C public" with the version 3 authentication data in my host config .cfg but no luck there so far.

snmp nagios check-snmp

1 Answers

  1. Looking at the man page again as Zoredache suggested I realized the case of options flags are different between snmpget and check_snmp for username and authPriv security level

    User is lowercase 'u' for snmpget and uppercase 'U' for check_snmp, security level is 'l' and 'L' for snmpget/check_snmp respectively.

    Also protocol specification goes form -v3 to --protocol=3

    in the objects/hostservice.cfg file I changed

    check_command    check_snmp!-C public -o sysUpTime.0

    to

    check_command    check_snmp!--protocol=3 -U [user] -L [noAuthNoPriv|authNoPriv|authPriv] -a [MD5|SHA] -A [password] -x [DES|AES] -X [password] -o sysUpTime.0

    and I get a proper response now

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