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To get a more accurate picture of the availability of your IT-services, it’s a good idea to test the IT-services over the network-link that serves your centralized IT-services to other geographic locations.

This how-to paper will describe how to perform the most basic test, a test that checks the average roundtrip-time and measures packet loss using check_ping. The test will be performed by a remote Microsoft Windows server and called via check_nrpe and NSClient++. This test/check/service can then be added to a service group that you can use when generating SLA-reports.

Other, higher level test, can be performed in the same way. For example check_tcp or check_http can be used.

Configuration at your remote windows server

  • Download and install .net framework 2.0 or later.
  • Download latest binary version of nagiospluginsnt:
    http://exchange.nagios.org/directory/Plugins/*-Plugin-Packages/NagiosPluginsNT/details
  • Place the plugins in some directory, for example C:\plugins
  • Testrun check_ping.exe at command-line. A good idea is to perform the test against a couple of the servers providing your centralized IT-services.
    C:>C:\plugins\check_ping.exe -H mailserver.domain.com -w 100,20% -c 500,60%
  • Add a command to NSClient++’s configuration file custom.ini:
    command[check_ping]=C:\plugins\check_ping.exe -H $ARG1$ -w $ARG2$ -c $ARG3$

If you want the possibility to supply arguments, like in the above example, you must explicitly allow this using the setting allow_arguments=1 in op5.ini.

In previous versions of check-nt the argument-numbers are numbered with number one starting directly after the plugin-name (in the above example ARG1 is “-H” ARG2 is “mailserver.domain.com”), this is corrected in newer versions of check_nrpe. In newer versions ARG1 is always ARG1. If you’re using old plugins, then this command is the one to put in op5.ini: command[check_ping]=C:\plugins\check_ping.exe -H $ARG6$ -w $ARG7$ -c $ARG8$

 

  • Restart NSClient++ to load the new settings.

Configuration at your op5 Monitor server

  • Test your new nrpe command at command-line:
    monitor!monitor:~$ /opt/plugins/check_nrpe -H remote-windows-server.domain.com -c check_ping -a mailserver.domain.com 100,20% 500,60%
  • Add a check-command to your configuration:
    command_name: check_ping_remote
    command_line: $USER1$/check_nrpe -H $ARG1$ -c check_ping -a $ARG2$ $ARG3$ $ARG4$
  • Add a new service to the host that you want to test the responsetime to:
    service_name: Responsetime from location
    check_command: check_ping_remote
    check_command_args: remote-windows-server.domain.com!mailserver.domain.com!100,20%!500,60%