Nagios Support Forum

Posted: **Wed Dec 23, 2015 9:08 am**

I am curious when someone uses:

command_line $USER1$/check_snmp_printer -H $HOSTADDRESS

in a command definition, how $HOSTADDRESS is resolved? Being on a unix box I know things do not always resolve physical names on the network.

So in my host definition am I supposed to enter the fully qualified domain name there? I have the IP listed as well as "address" but doesn't seem to be working right. Thought that field was just a display name not necessarily the actual machine name.

Here is what I'm doing.

In the printer.cfg:

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define host{
        use             generic-printer         ; Inherit default values from a template
        host_name       Dell_2130cn_Color_Laser ; The name we're giving to this printer
        alias           Dell LaserJet 2130n     ; A longer name associated with the printer
        address         192.168.0.4             ; IP address of the printer
        hostgroups      network-printers        ; Host groups this printer is associated with
        }


define service {
        host_name Dell_2130cn_Color_Laser
        use generic-service
        service_description Yellow2
        check_command check_printer!public!"CONSUM yellow"!20!10

In the command.cfg:

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define command{
        command_name check_printer
        command_line $USER1$/snmp_check_printer -H $HOSTADDRESS -C $ARG1$ -x $ARG2 -w $ARG3$ -c $ARG4$
        }

Output I get is:

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WARNING: No SNMP response from -C! Make sure host is up and SNMP is configured properly

This works manually so thinking the hostaddress isn't being passed as it seems to be using the -C as the device name.

JR

Posted: **Wed Dec 23, 2015 9:37 am**

Your problem is that you are missing the $ that goes at the end, it should be $HOSTADDRESS$

jriker1 wrote:So in my host definition am I supposed to enter the fully qualified domain name there? I have the IP listed as well as "address" but doesn't seem to be working right. Thought that field was just a display name not necessarily the actual machine name.

The address directive is what $HOSTADDRESS$ relates to.

Posted: **Wed Dec 23, 2015 9:43 am**

Bingo. Thanks. I can run some commands OK manually, but when the definitions are setup, they don't always work like this. Is there anyway to physically see what Nagios executed when the test ran?

Like when I do:

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./snmp_check_printer -H 192.168.0.4 -C public -x "CONSUM yellow"

I get:

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Yellow Cartridge is at 10% - WARNING!

When Nagios runs with the setup in my first post, I get

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UNKNOWN - OID not found! Your printer may not support checking this consumable. Use the CONSUM TEST option to determine which consumables may be monitored.

Thanks.

JR

Posted: **Wed Dec 23, 2015 9:54 am**

Note found the problem in an older post. With authors of the plugins would update things but guess good they have created these at all. Sample from author was missing the end dollar sign after $ARG2. Still like to know if there is a way to see the output of what Nagios ran when it executes these things.

JR

Posted: **Wed Dec 23, 2015 11:39 am**

For that level of troubleshooting you would need to enable debug logging in nagios.cfg (-1) and then watch the nagios.debug log file.

Posted: **Wed Dec 23, 2015 11:50 am**

Not exactly what you're looking for, but you can get a ton of information if you do the following:

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vi /usr/local/nagios/etc/nagios.cfg 
change debug_level=0 to debug_level=-1
service nagios restart
tail -f /usr/local/nagios/var/nagios.debug

Nagios Support Forum

Use of $HOSTADDRESS

Use of $HOSTADDRESS

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Re: Use of $HOSTADDRESS