Nagios monitoring of PFsense interfaces

marion.miller

I am trying to monitor pfsense gateways with a nagios server. I seem to have everything setup fine since these commands work

sudo /usr/local/nagios/libexec/check_nrpe -H x.x.x.x -c check_load
sudo /usr/local/nagios/libexec/check_nrpe -H x.x.x.x -c check_users

but when I try

sudo /usr/local/nagios/libexec/check_nrpe -H x.x.x.x -c check_ifstatus -a Lan

I get "NRPE: Unable to read output"

I have added the check_ifstatus command into pfsense's NRPE settings. Any ideas?

Thanks in advance.

stephenw10

Was is the command? Does it run locally? Can you see what it's returning?

'Lan' there looks a bit suspicious. I expect that to be LAN or lan. Unless that's not the interface but some parameters.

Steve

marion.miller

@stephenw1You are correct, it should be LAN. it fails with that also. the command is check_ifstatus. I want to know when an interface goes down.

stephenw10

Ah, it;'s because:

[2.6.0-RELEASE][admin@cedev-6.stevew.lan]/usr/local/libexec/nagios: ./check_ifstatus 
Can't locate Net/SNMP.pm in @INC (you may need to install the Net::SNMP module) (@INC contains: /usr/local/libexec/nagios /usr/local/lib/perl5/site_perl/mach/5.32 /usr/local/lib/perl5/site_perl /usr/local/lib/perl5/5.32/mach /usr/local/lib/perl5/5.32) at ./check_ifstatus line 41.
BEGIN failed--compilation aborted at ./check_ifstatus line 41.

Looking.....

marion.miller

@stephenw10 INstalled Net-SNMP and enabled in on pfsense and get the same error.

stephenw10

Yeah, you need that package to get the SNMP perl module. But it appears to be in the correct location. Or at least a location that is referenced by the INC file. It should find it....

stephenw10

No, it is looking in the wrong place.

Try:

ln /usr/local/lib/perl5/site_perl/mach/5.32/SNMP.pm /usr/local/lib/perl5/5.32/Net/SNMP.pm

Then retest.

stephenw10

https://redmine.pfsense.org/issues/13509

marion.miller

Getting closer. It recognizes it but now gives these errors

Subroutine AUTOLOAD redefined at /usr/local/lib/perl5/site_perl/mach/5.32/SNMP.pm line 53.
Subroutine register_debug_tokens redefined at /usr/local/lib/perl5/site_perl/mach/5.32/SNMP.pm line 138.
Subroutine getenv redefined at /usr/local/lib/perl5/site_perl/mach/5.32/SNMP.pm line 144.
Subroutine setenv redefined at /usr/local/lib/perl5/site_perl/mach/5.32/SNMP.pm line 150.
Subroutine setMib redefined at /usr/local/lib/perl5/site_perl/mach/5.32/SNMP.pm line 158.
Subroutine initMib redefined at /usr/local/lib/perl5/site_perl/mach/5.32/SNMP.pm line 169.
Subroutine addMibDirs redefined at /usr/local/lib/perl5/site_perl/mach/5.32/SNMP.pm line 186.
Subroutine addMibFiles redefined at /usr/local/lib/perl5/site_perl/mach/5.32/SNMP.pm line 195.
Subroutine loadModules redefined at /usr/local/lib/perl5/site_perl/mach/5.32/SNMP.pm line 205.
Subroutine unloadModules redefined at /usr/local/lib/perl5/site_perl/mach/5.32/SNMP.pm line 216.
Subroutine translateObj redefined at /usr/local/lib/perl5/site_perl/mach/5.32/SNMP.pm line 222.
Subroutine getType redefined at /usr/local/lib/perl5/site_perl/mach/5.32/SNMP.pm line 251.
Can't locate object method "session" via package "Net::SNMP" (perhaps you forgot to load "Net::SNMP"?) at /usr/local/libexec/nagios/check_ifstatus line 128.

stephenw10

That's after adding the symlink?

marion.miller

@stephenw10
Yes

stephenw10

Mmm, OK I replicated that. That clearly that is loaded though. Something in the perl config maybe. Someone more familiar with perl will need to look at it.