check_eximailqueue: query returned no output! [FIX]

If you are icinga/nagios user and dealing with exim, you probably know for wonderful plugin check_eximailqueue. This plugin warns you when there are specific amount of email in your exim mail queue. Usually this indicates spam.

I installed this plugin on CentOS 7 with Directadmin installed. When I was executing plugin locally, it worked fine. But when I tried to execute it remotely (from Icinga server), it failed.

This was error returned when executing from Icinga server:

> # /usr/local/libexec/nagios/check_nrpe -H my.serverhostname.com -c check_exim_queue
Mailqueue WARNING - query returned no output!

I added “nagios  ALL=(ALL) NOPASSWD:/usr/sbin/exim” to my /etc/sudoers file but error still persisted. I manually set Exim and sudo path in script. Error was still there.

If you check your nrpe process, you’ll see that it runs by nrpe user and not nagios!

[root@da ~]# ps -aux | grep nrpe
 nrpe 26993 0.0 0.0 46356 1460 ? Ss 10:44 0:00 /usr/sbin/nrpe -c /etc/nagios/nrpe.cfg -d

Solution is very simple. Just change “nagios ALL=(ALL) NOPASSWD:/usr/sbin/exim”  to “nrpe ALL=(ALL) NOPASSWD:/usr/sbin/exim”  in your /etc/sudoers – replace user nagios with nrpe. It should work.

I hope it helps 🙂

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