HowTo monitor a linux server with NRPE – Introduction
This guide shows you howto monitor a linux server with NRPE. The Nagios Remote Plugin executor. It will shortly describe the steps to execute on the to be monitored server and provide the necessary tasks to include the services in Nagios or Icinga
Requirements and Definitions for monitoring a Linux Server with NRPE
Throughout this HowTo, the IP address of the Icinga/Nagios server will be 10.0.0.200
Linux Server Setup
In order to monitor a linux server with NRPE we have to install the NRPE software on your linux system which mostly consist of downloading and compiling it. We will also have to download the actual plugins and compile these on the system as well so everything is working with the architecture (32/64bit) and libraries on our linux server.
NRPE and Plugin Installation
yum install -y gcc openssl-devel openssl glibc.i686 cd /usr/src wget http://sourceforge.net/projects/nagios/files/nrpe-2.x/nrpe-2.15/nrpe-2.15.tar.gz -O nrpe.tgz tar -xzvf nrpe.tgz rm -f nrpe.tgz cd nrpe-2.15/ adduser nagios -s /sbin/nologin ./configure --enable-ssl make all make install make install-plugin make install-daemon make install-daemon-config echo "nrpe 5666/tcp # nrpe" >> /etc/services make install-xinetd cat /etc/xinetd.d/nrpe sed -i 's/127\.0\.0\.1/10.0.0.200/ig' /etc/xinetd.d/nrpe cat /etc/xinetd.d/nrpe cd /tmp wget https://www.monitoring-plugins.org/download/monitoring-plugins-2.1.2.tar.gz tar -xzvf monitoring-plugins-2.1.2.tar.gz rm -f monitoring-plugins-2.1.2.tar.gz cd monitoring-plugins-2.1.2 ./configure --with-openssl --prefix=/usr/local/nagios/ make all make install sed -i 's/127\.0\.0\.1/10.0.0.200/ig' /usr/local/nagios/etc/nrpe.cfg /etc/init.d/xinetd restart
Example NRPE Configuration ( /usr/local/nagios/etc/nrpe.cfg )
The following part of the nrpe.cfg file provides an example for monitoring a Linux Server with NRPE.
# COMMAND DEFINITIONS # Check Symantec Backup Client command[check_symantec]=/usr/local/nagios/libexec/check_procs -C beremote -c 1: -m PROCS # Check Swap Space command[check_swap]=/usr/local/nagios/libexec/check_swap -w 40 -c 20 # Check users command[check_users]=/usr/local/nagios/libexec/check_users -w 60 -c 80 # Check System load command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20 # Check Logical VOlume command[check_root]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/mapper/VolGroup00-LogVol00 # Check Zombie processes command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z # Check processes command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 800 -c 1000 # Check ntp time sync command[check_ntp_time]=/usr/local/nagios/libexec/check_ntp_time -H myNTPServer # Check Mail Queue command[check_mailq]=/usr/local/nagios/libexec/check_mailq -w 10 -c 20 # Check local webserver command[check_http]=/usr/local/nagios/libexec/check_http -H localhost -p 80 # Check local mail server command[check_mail_local]=/usr/local/nagios/libexec/check_smtp -H localhost -p 25 # Check remote mail server command[check_mail_remote]=/usr/local/nagios/libexec/check_smtp -H myMailGateway -p 25 # Check Print Queue command[check_lpstat]=/usr/local/nagios/libexec/check_lpstat.pl -w 1 -c 2