Linux Admin Zone

One of my colleage performed speedy installation of NRPE module in a machine but found that the Nagios server is not able to query that machine.

In Nagios screen it shows:
NRPE: Unable to read output.

Checking from the machine itself, NRPE is giving correct version but throwing same error for any other checks:
[root@domU:/usr/local/nagios/libexec] ./check_nrpe -H localhost
NRPE v2.8

[root@domU:/usr/local/nagios/libexec] ./check_nrpe -H localhost -c check_load
NRPE: Unable to read output

After further digging, I’ve found he installed Nagios-plugins using yum which placed plugins files in some different location then desired by NRPE.

Then I installed nagios-plugins manually:
# cd /usr/src
# wget http://osdn.dl.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.6.tar.gz
# tar xzf nagios-plugins-1.4.6.tar.gz
# cd nagios-plugins-1.4.6
# ./configure --without-mysql
# make
# make install

The problem is resolved immediately.