nrpe 2.15 - nagios 3.5.1 problem -> wrong parameter list

[Mike_J]

I installed nagios 3.5.1 on ubuntu 14.04 (apt-get install nagios3, apt-get install nagios-nrpe-plugin). On a remote ubuntu 14.04 server, I installed nrpe-server (apt-get install nagios-nrpe-server). There seems to be a problem when not passing arguments. (Or maybe I'm missing something obvious)

I see these error messages in the web gui - CHECK_NRPE: Received 0 bytes from daemon. Check the remote server logs for error messages.

config sample on master: my.server.cfg has this service defined:

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define service{
        use                             generic-service         ; Name of service template to use
        host_name                       Server1
        service_description             Disk Space
        check_command                   check_nrpe!check_disk1
        }

config on remote server:

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dont_blame_nrpe=0
command[check_disk1]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /dev/hda1

From the command line, it works:

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$  /usr/lib/nagios/plugins/check_nrpe -H my.ip.add.ress -c check_disk1
DISK OK - free space: / 46920 MB (97% inode=97%);| /=1194MB;40208;45234;0;50260

I turned on debug on the master and I see this in the nagios.debug log:

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**** BEGIN MACRO PROCESSING ***********
Processing: '/usr/lib/nagios/plugins/check_nrpe -H $HOSTADDRESS$ -c $ARG1$ -a $ARG2$'
Done.  Final output: '/usr/lib/nagios/plugins/check_nrpe -H my.ip.add.ress -c check_disk1 -a '
**** END MACRO PROCESSING *************

NOTE that there is a '-a' at the end of the output line. Why is that? When I cut and paste that to a command line, the check fails:

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$ /usr/lib/nagios/plugins/check_nrpe -H my.ip.add.ress -c check_disk1 -a
/usr/lib/nagios/plugins/check_nrpe: option requires an argument -- 'a'

AND that is the problem. How do I stop nagios from putting "-a" at the end of the command when I'm not passing any parameters?

[lmiltchev]

You are trying to pass an argument:

/usr/lib/nagios/plugins/check_nrpe -H my.ip.add.ress -c check_disk1 -a
Processing: '/usr/lib/nagios/plugins/check_nrpe -H $HOSTADDRESS$ -c $ARG1$ -a $ARG2$'

that's why it is failing. You cannot pass arguments as on the remote server, in the nrpe.cfg, you have:

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dont_blame_nrpe=0

Try running from the CLI on the nagios server:

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/usr/lib/nagios/plugins/check_nrpe -H my.ip.add.ress -c check_disk1

This should work.

Is the "check_nrpe" command defined with a "-a" flag?

[Mike_J]

You can see in my original post - i tried your suggestion and it worked. Why is the nagios macro processing the command with "-a" when I don't have any parameters in the nagios cfg file?

Master server cfg snippet:
check_service check_nrpe!check_disk1 <=== NOTE: no parameters for check_disk1

What am I missing?

[lmiltchev]

Can you show us the "check_nrpe" command definition?

[Mike_J]

Thanks for pointing me in the right direction. There is a check_nrpe_1arg definition as well as a check_nrpe in /etc/nagios-plugins/config/check_nrpe.cfg. When I changed my server cfg file to use check_nrpe_1arg, everything began to work.

Thanks again!