NRPE troubleshooting


 To make nrpe daemon log plugins output, add this to the command definition: 2>&1




 # 'check_local_mailq' command definition
define command{
        command_name    check_local_mailq
        command_line    /usr/bin/sudo /usr/lib64/nagios/plugins/check_mailq -w 1 -c 2 > /tmp/nagiosdebug 2>&1

Of course, make sure the user running nrpe or the plugin can write to the file (/tmp/nagiosdebug in this case).


# tail -f /tmp/nagiosdebug
sudo: sorry, you must have a tty to run sudo

I just added this in my sudo configuration

# Required for check_mailq
Defaults:nagios !requiretty

And now it works!

Important: once you're done debugging, remove the redirection, so that Nagios can get access to the output. Otherwise, you'll see "null" in the output instead of something like: OK: mailq is empty


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