Nagios: Enable external commands

"Here we are again, back witho ur old friend Nagios. If you’ve been following you know I have covered quite a bit of ground with this outstanding network monitoring tool (check all Ghacks Nagios articles). There is a reason for this, Nagios is an incredible tool. But for many of you, you might have come across an error when attempting to run a few of the more powerful features. This error happens when you attempt to use any of Nagios’ external commands. But what are these external commands? Nagios is capable of running commands from external applications. This allows Nagios to expand farther than it could otherwise.

"But when you see this error you know that your Nagios installation isn’t able to use any external commands. Fear not, this error is simple to over come, and in this article I am going to walk you through the fix."

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