Nsclient++ Check_Mem

[slansing]

Did you copy your nsclient/nsc.ini file? Or manually remove a large chunk of it, even for the unexpanded file yours is very bare. You may need to look at re-installing nsclient, perhaps version 3.9.x instead of 4.0.x as it will already be expanded and should work from the start.

[FTL]

Steps you need to do:

On Windows remote client you are monitoring:

• Install NSClient++ - do not start the service.
  Check whatever firewall is on the machine (if any) and make sure port 5666 is open. Do a telnet from your nagios machine to remote server ip 5666 to check.
  Open up a cmd prompt and type in "cd C:\Program Files\NSClient++" without the "" - hit enter
  type in "nscp settings --generate --add-defaults --load-all" - without the "" - hit enter
  Go into C:\program files\nsclient++ and open up the nsclient.ini file

Match the following lines i am giving you in your nsclient.ini file (do a ctrl+f and copy the top line in and find it, then change the value)[/list]

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; NRPE server - A simple server that listens for incoming NRPE connection and handles them.
NRPEServer = 1

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; ALLOWED HOSTS - A comaseparated list of allowed hosts. You can use netmasks (/ syntax) or * to create ranges.
allowed hosts = your nagios servers IP

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; Section for NRPE (NRPEServer.dll) (check_nrpe) protocol options.
[/settings/NRPE/server]

; COMMAND ARGUMENT PROCESSING - This option determines whether or not the we will allow clients to specify arguments to commands that are executed.
allow arguments = true

; COMMAND ALLOW NASTY META CHARS - This option determines whether or not the we will allow clients to specify nasty (as in |`&><'"\[]{}) characters in arguments.
allow nasty characters = true

; PORT NUMBER - Port to use for NRPE.
port = 5666

You can leave everything else as default for now.

Start the NSClient service from services.msc


On your Nagios box

Install check_nrpe as the root user - so change to the root user in a terminal

• cd ~/downloads
  wget http://sourceforge.net/projects/nagios/ ... z/download
  tar xzf nrpe-2.15.tar.gz
  cd nrpe-2.15
  ./configure
  make all
  make install-plugin

Now configure your Nagios with the following (substitute "use" and host_name" to match your requirements)

The actual service check for the host

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define service{
    use            your template              ; See Service Templates section below    
    host_name        your host                    
    service_description    MEMORY USAGE                    
    check_command        check_memory                   ; See Commands section below
    }

The command check for check_memory

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# 'check_memory' command defintion
define command{
    command_name    check_memory
    command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -p 5666 -c checkMEM -a MaxWarn=XX% MaxCrit=XX% type=physical
    }

This is it - you will now have your memory monitored using check_nrpe via NSClient.

You need to do no more.

[tenda21]

but wrong result:

Error: /usr/local/nagios/libexec/check_nrpe -H 192.168.1.218 -c check_memory
UNKNOWN: No handler for that command

Have version 3.9. as recommended slansing

[slansing]

Excellent outline FTL,

By default, NSClient++ has a handful of NRPE definitions which are slotted with "alias_" in front of them, give this one a shot:

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/usr/local/nagios/libexec/check_nrpe -H 192.168.1.218 -c alias_mem

If you look in your NSC.ini file, you should see this:

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alias_mem=checkMem MaxWarn=80% MaxCrit=90% ShowAll=long type=physical type=virtual type=paged type=page

[tenda21]

Done
works, solved the problem changing NSClient + + 4.2.x, NSClient++ 3.9.x, and using alias mem.
Tanks for help

[FTL]

but wrong result:

Error: /usr/local/nagios/libexec/check_nrpe -H 192.168.1.218 -c check_memory
UNKNOWN: No handler for that command

Have version 3.9. as recommended slansing

No..........."check_memory" is just what i have called my own command is isnt the actual command parameter.

The actual check_nrpe command is checkMEM

so its

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check_nrpe -H 192.168.1.218 -p 5666 -c checkMem -a Maxwarn=90% Maxcrit=95% type=physical

[lmiltchev]

@tenda21
I am glad your issue has been resolved! I am locking this topic.

@FTL
Thanks for the help!