I am running /usr/lib64/nagios/plugins/check_nrpe -H -c check_disk as root yet get NRPE: Unable to read output.

Any help?

  • 1
    What does grep check_disk /etc/nagios/nrpe.cfg return (cut-and-paste into your question, please)?
    – MadHatter
    Sep 30, 2014 at 20:35
  • 1
    After you try MadHatter's suggestion, you might want to try running the nrpe check as the nagios user on the remote host to make sure there are no permissions problems. 80% of the time when I get that error, its a permissions/ownership problem. You can also try the -n flag to check_nrpe to make sure that SSL is working properly. Lastly, if its not a supplied check (I write a lot of my own NRPE checks), you can get that error if the script outputs junk text. Unlikely to be the problem with check_disk, assuming it's defined in the nrpe.cfg and installed correctly. Sep 30, 2014 at 21:26
  • @MadHatter [root@1 ~]# ls /etc/nagios/nrpe.d/ nrpe-check_cpu.cfg nrpe-check_disk.cfg nrpe-check_load.cfg nrpe-check_ntp_time.cfg nrpe-check_ram.cfg nrpe-check_swap.cfg. I am using puppet to manage nagios. Contents of /etc/nagios/nrpe.d/nrpe-check_disk.cfg are # Configuration for check_disk (from the generic template) command[check_disk]=/usr/libexec/nagios/plugins/check_disk -l -X binfmt_misc -X rpc_pipefs -w 5% -c 2%
    – pcfreak30
    Sep 30, 2014 at 21:47
  • @SomeLinuxNerd I have ran this remotely and locally as nagios and on the client. Some commands return a value, some return the unable to read output.
    – pcfreak30
    Sep 30, 2014 at 21:50

1 Answer 1


Turns out the puppet module https://github.com/thias/puppet-nagios has a bug causing the commands to be referenced from a non existent folder /usr/libexec/nagios/plugins/ vs /usr/lib64/nagios/plugins/.

  • If by "bug" you mean "that's the default path if you install Nagios/NRPE from source"
    – Keith
    Oct 1, 2014 at 15:06
  • I use RPM's, not source on CentOS 6.5, so its stores in lib/lib64, rather than libexec. Puppet module wasn't using correct paths.
    – pcfreak30
    Oct 1, 2014 at 16:23

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