Install and Configure NRPE in CentOS

 Install NRPE on Linux

NRPE is called as ‘Nagios Remote Plugin Executere’. NRPE allows nagios server
to remotely execute nagios commands or plugins on other Linux/Unix machines. NRPE is also available windows servers.
Following document shows you how to install NRPE, I am installing it on CentOS 6.4

1] Install NRPE required packages.

[root@server ~]# yum install openssl-devel gcc xinetd make

2] NRPE runs under the user "nagios", so let's add that user.

[root@server ~]# useradd nagios

3] Download and install Nagios-plugins.

[root@server downloads]# wget https://nagios-plugins.org/download/nagios-plugins-2.0.tar.gz

[root@server downloads]# tar -xvzf nagios-plugins-2.0.tar.gz

[root@server downloads]# cd nagios-plugins-2.0

[root@server nagios-plugins-2.0]# ./configure --with-nagios-user=nagios --with-nagios-group=nagios

[root@server nagios-plugins-2.0]# make install

4] Assign nagios user ownership to nagios commands.

[root@server nagios-plugins-2.0]# chown -R nagios:nagios /usr/local/nagios/libexec


5] Install and configure NRPE nagios client.

[root@server downloads]# wget http://downloads.sourceforge.net/project/nagios/nrpe-2.x/nrpe-2.15/nrpe-2.15.tar.gz?r=&ts=1363788540&use_mirror=hivelocity

[root@server downloads]# tar -xvzf nrpe-2.15.tar.gz

[root@server downloads]# cd nrpe-2.15.tar.gz

[root@server downloads]# ./configure --enable-ssl

[root@server nrpe-2.15]# make all

[root@server nrpe-2.15]# make install-plugin

[root@server nrpe-2.15]# make install-daemon

[root@server nrpe-2.15]# make install-daemon-config

[root@server nrpe-2.15]# make install-xinetd

6] Add following line at the end of file for NRPE in /etc/services

[root@server ~]# vi /etc/services
nrpe            5666/tcp                # NRPE

7] NRPE will run under xinetd daemon. So update xinetd file.

[root@server ~]# vi /etc/xinetd.d/nrpe

# default: on
# description: NRPE (Nagios Remote Plugin Executor)
service nrpe
{
        flags           = REUSE
        socket_type     = stream
        port             = 5666
        wait            = no
        user            = nagios
        group           = nagios
        server          = /usr/local/nagios/bin/nrpe
        server_args     = -c /usr/local/nagios/etc/nrpe.cfg --inetd
        log_on_failure  += USERID
        disable         = no
        only_from       = 127.0.0.1 192.168.1.1 --> [ Your Nagios Server IP ]
}

8] Star/Restart xinetd service.

[root@server ~]# service xinetd start

[root@server ~]# chkconfig xinetd on