http://www.cyberz.org/blog Andrea Leofreddi's homepage Tue, 10 Aug 2010 17:19:43 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 http://www.cyberz.org/blog/2009/01/03/nagios-nrpe-and-sudo-nrpe-unable-to-read-output/ http://www.cyberz.org/blog/2009/01/03/nagios-nrpe-and-sudo-nrpe-unable-to-read-output/#comments Sat, 03 Jan 2009 18:21:21 +0000 andrea http://www.cyberz.org/blog/?p=49 On CentOS 5 (and RedHat EL as well), you can encounter the following behaviour when configuring an nrpe plugin with sudo:

[andrea@feyd ~]$ /usr/lib/nagios/plugins/check_nrpe -H 1.2.3.4 -c check_md_raid
NRPE: Unable to read output


Given that check_md_raid is defined as follows, in nrpe.conf:

command[check_md_raid]=sudo /usr/local/bin/nagios_check_md_raid

And given (for completeness) its relative /etc/sudoers line as follows:

nagios ALL=(ALL) NOPASSWD:/usr/local/bin/nagios_check_md_raid

Then the problem is in the requiretty options in /etc/sudoers, enabled by default on CentOS. Simply comment it as follows:

#Defaults requiretty

After that the plugin should work as expected:

[andrea@feyd ~]$ /usr/lib/nagios/plugins/check_nrpe -H 1.2.3.4 -c check_md_raid
RAID OK: All arrays OK [1 array checked]


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