Nagios Support Forum

Posted: **Mon Jun 22, 2015 9:53 pm**

Having a bit of trouble with this plugin check_uptime http://nagios-plugins.org/doc/man/check_uptime.html

I'm able to run the command manually from the nagios server and return a value

useraccount@nagios:/usr/local/nagios/etc/objects/company$ /usr/local/nagios/libexec/check_nrpe -H 192.168.2.117 -c check_uptime
OK: uptime: 4d 02:31h, boot: 2015-Jun-19 00:07:50 (UTC)|'uptime'=354702s;172800;86400

But when trying to add this into a host.cfg file I'm getting a (No output returned from plugin).

I can also see when manually running the above command I can see from the nscp log "nrpe Accepting connection from: 192.168.11.222, count=1" on the windows host which then gives me the above result a second after, but when trying to force a recheck from nagios web interface this doesn't occur on the command window.

host.cfg
define service{
use generic-service
host_name Test_Machine1
service_description check_uptime
check_command check_nrpe!check_uptime -H 192.168.2.117 days 3 5
}

command.cfg
# 'check_uptime' command definition for linux hosts
define command{
command_name check_uptime
command_line $USER1$/check_uptime -o $ARG1$ -w $ARG2$ -c $ARG3$
}

What I ultimately want is check_uptime -o days -w 70 -c 90

Any Idea's?

Posted: **Tue Jun 23, 2015 9:12 am**

Mcw33 wrote:host.cfg
define service{
use generic-service
host_name Test_Machine1
service_description check_uptime
check_command check_nrpe!check_uptime -H 192.168.2.117 days 3 5
}

command.cfg
# 'check_uptime' command definition for linux hosts
define command{
command_name check_uptime
command_line $USER1$/check_uptime -o $ARG1$ -w $ARG2$ -c $ARG3$
}

In the above service definition you're running the command check_nrpe, not check_uptime. While this is proper, we cannot troubleshoot without seeing your check_nrpe command definition. Based upon what you have though, it should look something like this:

Code: Select all

define command {
       command_name                             check_nrpe
       command_line                             $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}

define service {
       .....
       check_commnad                            check_nrpe!check_uptime
       .....
}

If you have arguments enabled you can pass your thresholds as such:

Code: Select all

define service {
       .....
       check_commnad                            check_nrpe!check_uptime -u days -w 70 -c 90
       .....
}

Otherwise you'll have to handle it in nrpe.cfg.

Posted: **Tue Jun 23, 2015 3:28 pm**

Hi, Thanks for the reply.

This is the only "nrpe.cfg file I can find "check_nrpe.cfg" what modifications wouldn I need to make here? Located in /etc/nagios-plugins/config

# this command runs a program $ARG1$ with arguments $ARG2$
define command {
command_name check_nrpe
command_line /usr/lib/nagios/plugins/check_nrpe -H $HOSTADDRESS$ -c $ARG1$ -a $ARG2$
}

# this command runs a program $ARG1$ with no arguments
define command {
command_name check_nrpe_1arg
command_line /usr/lib/nagios/plugins/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}

Posted: **Tue Jun 23, 2015 3:53 pm**

Well, you will need to edit the nrpe.cfg file on the remote nrpe host, add the command there, and then call it through check_nrpe from the nagios server. The following steps assume that nrpe and the nagios-plugins package are installed on the remote host with defualt ./configure options.
On the remote host, edit:

Code: Select all

/usr/local/nagios/etc/nrpe.cfg

Add:

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command[check_uptime]=/usr/local/nagios/libexec/check_uptime  $ARG1$

Also, verify that nrpe is configured to support arguments:

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dont_blame_nrpe=1

Save out and restart nrpe:

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service xinetd restart

Or:

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service nrpe restart

Now, we need to check the command and service check definitions on the nagios box:

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host.cfg
define service{
use generic-service
host_name Test_Machine1
service_description check_uptime
check_command check_uptime!-u days -w 70 -c 90
}

command.cfg
# 'check_uptime' command definition for linux hosts
define command{
command_name check_uptime
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c check_uptime -a $ARG1$
}

Does this make sense?

Posted: **Sun Jun 28, 2015 4:38 pm**

Hi sorry been a bit busy with other work things.

It's made sense and I've made the changes advised, one thing I have found is there is no nrpe.cfg file on the remote host, I wasn't the one to setup this nagios box so I don't know why.
I've tried a quick google to see what I need to do to setup this but haven't come across whats needed. I've created the file in /usr/local/nagios/etc/nrpe.cfg and listed the following

Code: Select all

command[check_uptime]=/usr/local/nagios/libexec/check_uptime  $ARG1$

dont_blame_nrpe=1

edit: Sorry installed the nagios-nrpe-server plugin and added the above details. Still showing as no "(No output returned from plugin)" and I can't see the nsclient.log file receiving the command. I have been able to return a output from the nagios server to this host so I know there isn't any FW/Network issues in between them

Posted: **Sun Jun 28, 2015 7:43 pm**

Lets see if we can find the nrpe.cfg file as the one you create may not be reference.

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find / -name 'nrpe.cfg'

Does this file exist: /etc/xinetd.d/nrpe

If so, it will reference the nrpe.cfg file

Posted: **Mon Jun 29, 2015 9:55 pm**

Hi, I get the following

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User@nagios:~$ sudo find / -name 'nrpe.cfg'
[sudo] password for user:
/etc/nagios/nrpe.cfg
/usr/local/nagios/etc/nrpe.cfg

Posted: **Mon Jun 29, 2015 10:31 pm**

I believe this file:

/etc/nagios/nrpe.cfg

is what you need to define the following in:

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command[check_uptime]=/usr/local/nagios/libexec/check_uptime $ARG1$

dont_blame_nrpe=1

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