Cannot get check_uptime plugin for Nagios to work. Unknown status?

Question

Hoping you guys might be able to spot what i'm missing here. I'm not able to get a simple check_uptime plugin to work in Nagios.

When I invoke help for the plugin using:

/usr/local/nagios/libexec/check_uptime -h

the result is:

 usage: /usr/local/nagios/libexec/check_uptime [-c OPTION]

This script checks uptime and optionally verifies if the uptime
is below MINIMUM or above MAXIMUM uptime treshholds

OPTIONS:
-h Help
-c CRITICAL MIN uptime (minutes)
-w WARNING MIN uptime (minutes)
-C CRITICAL MAX uptime (minutes)
-W WARNING MAX uptime (minutes)
-V Version

So I tried to implement this plugin on both the nagios linux server and a linux client. I basically want the plugin to run on the remote machine named machine1 in the format

check_uptime -w 15 -c 30

The plugin executes fine on both the server and the client. The plugin also exists on both of them under /usr/local/nagios/libexec/check_uptime.

Here are my settings:

On the server:

I appended the following to /usr/local/nagios/etc/objects/commands.cfg

# 'check_uptime' command definition for linux hosts
define command{
        command_name    check_uptime
        command_line    $USER1$/check_uptime -H $HOSTADDRESS$ -w $ARG1$ -c $ARG2$
}

I appended the following to /usr/local/nagios/etc/objects/hosts/machine1.cfg:

 define service{
        use                             generic-service
        host_name                       machine1
        service_description             Uptime
        check_command                   check_uptime
}

On the machine1:

I'm appending this to /usr/local/nagios/etc/nrpe.cfg:

command[check_uptime]=/usr/local/nagios/libexec/check_uptime -w 15 -c 30

Then I'm testing the configuration on the server by running:

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

And I'm getting 0 warnings and 0 errors, yet in the Nagios console the service shows up as unknown.

What am I missing?

Thanks guys!

Answer 1

Nver mind. I figured it out.

Looks like I have to invoke check_nrpe in /usr/local/nagios/etc/objects/hosts/machine1.cfg as follows:

    define service{
        use                             generic-service
        host_name                       machine1
        service_description             Uptime
        check_command                   check_nrpe!check_uptime
}

Edit: It also looks that the check_uptime command should not be invoked with the -H $HOSTADDRESS$ parameter in commands.cfg on the server end. Once that is removed, it will work on the server.

Hope this helps somebody else.

Answer 2

Just thought I would put my two cents in I am using Nagios Core 4.08 and in my commands.cfg file I used it like this:

# comment: `check_uptime` this is to check system up time on linux boxes

define command {
    command_name check_uptime
    command_line $USER1$/check_uptime
    }

Then in the host1.cfg I did the following:

# comment: Check uptime of the server

define service{
    use                             local-service
    host_name                       host1
    service_description             Uptime
    check_command                   check_uptime
    }

And the result was this:

Uptime
OK  06-23-2015 07:52:48 0d 0h 4m 19s    1/4 Uptime OK: 7 day(s) 23 hour(s) 5 minute(s) 

So with just a simple addition it worked for me. Hope this helps everyone. I apologize I don't know how to format this.