NRPE Remote Server Installation and Setup
Create Nagios user account on remote server to be monitored:
# useradd nagios
# passwd nagios Download and Install Nagios Plugins:
# mkdir -p /opt/Nagios/Nagios_Plugins # cd /opt/Nagios/Nagios_Plugins Save file to directory /opt/Nagios
As of this writing Nagios 3.0.6 (Stable) and Nagios Plugins 1.4.13 (Stable)
Extract Files:
# tar xzf nagios-plugins-1.4.13.tar.gz
# cd nagios-plugins-1.4.13 Compile and Configure Nagios Plugins
** You need the openssl-devel package installed to compile plugins with ssl support. **
# yum -y install openssl-devel Instal Plugins:
# ./configure --with-nagios-user=nagios --with-nagios-group=nagios # make # make install The permissions on the plugin directory and the plugins will need to be changed to nagios user
# chown nagios.nagios /usr/local/nagios # chown -R nagios.nagios /usr/local/nagios/libexec Package xinted is needed
# yum install xinetd Downlad and Install NRPE Daemon
# mkdir -p /opt/Nagios/Nagios_NRPE # cd /opt/Nagios/Nagios_NRPE Save file to directory /opt/Nagios
As of this writing NRPE 2.12 (Stable)
Extract the Files:
# tar -xzf nrpe-2.12.tar.gz # cd nrpe-2.12 Compile and Configure NRPE
** You need the openssl-devel package installed to compile NRPE with ssl support. **
# yum -y install openssl-devel Install NRPE:
# ./configure
General Options:
-------------------------
NRPE port: 5666
NRPE user: nagios
NRPE group: nagios
Nagios user: nagios
Nagios group: nagios
# make all
# make install-plugin
# make install-daemon
# make install-daemon-config
# make install-xinetd Post NRPE Configuration
Edit Xinetd NRPE entry:
Add Nagios Monitoring server to the “only_from” directive
# vi /etc/xinetd.d/nrpe
only_from = 127.0.0.1 <nagios_ip_address> Edit services file entry:
Add entry for nrpe daemon
# vi /etc/services
nrpe 5666/tcp # NRPE Restart Xinetd and Set to start at boot:
# chkconfig xinetd on
# service xinetd restart Test NRPE Daemon Install
Check NRPE daemon is running and listening on port 5666:
# netstat -at |grep nrpe Output should be:
tcp 0 0 *:nrpe *.* LISTEN Check NRPE daemon is functioning:
# /usr/local/nagios/libexec/check_nrpe -H localhost Output should be NRPE version:
NRPE v2.12 Open Port 5666 on Firewall
Make sure to open port 5666 on the firewall of the remote server so that the Nagios monitoring server can access the NRPE daemon.
Nagios Monitoring Host Server Setup
Downlad and Install NRPE Plugin
# mkdir -p /opt/Nagios/Nagios_NRPE # cd /opt/Nagios/Nagios_NRPE Save file to directory /opt/Nagios
As of this writing NRPE 2.12 (Stable)
Extract the Files:
# tar -xzf nrpe-2.12.tar.gz # cd nrpe-2.12 Compile and Configure NRPE
# ./configure
# make all
# make install-plugin Test Connection to NRPE daemon on Remote Server
Lets now make sure that the NRPE on our Nagios server can talk to the NRPE daemon on the remote server we want to monitor. Replace “<IP of Remote Server>” with the remote servers IP address.
# /usr/local/nagios/libexec/check_nrpe -H <IP of Remote Server>
NRPE v2.12 Create NRPE Command Definition
A command definition needs to be created in order for the check_nrpe plugin to be used by nagios.
# vi /usr/local/nagios/etc/objects/commands.cfg Add the following:
###############################################################################
# NRPE CHECK COMMAND
#
# Command to use NRPE to check remote host systems
###############################################################################
define command{
command_name check_nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
} Create Linux Object template
In order to be able to add the remote linux machine to Nagios we need to create an object template file adn add some object definitions.
Create new linux-box-remote object template file:
# vi /usr/local/nagios/etc/objects/linux-box-remote.cfg Add the following and replace the values “host_name” “alias” “address” with the values that match your setup:
** The “host_name” you set for the “define_host” section must match the “host_name” in the “define_service” section **
define host{
name linux-box-remote ; Name of this template
use generic-host ; Inherit default values
check_period 24x7
check_interval 5
retry_interval 1
max_check_attempts 10
check_command check-host-alive
notification_period 24x7
notification_interval 30
notification_options d,r
contact_groups admins
register 0 ; DONT REGISTER THIS - ITS A TEMPLATE
}
define host{
use linux-box-remote ; Inherit default values from a template
host_name Centos5 ; The name we're giving to this server
alias Centos5 ; A longer name for the server
address 192.168.0.5 ; IP address of the server
}
define service{
use generic-service
host_name Centos5
service_description CPU Load
check_command check_nrpe!check_load
}
define service{
use generic-service
host_name Centos5
service_description Current Users
check_command check_nrpe!check_users
}
define service{
use generic-service
host_name Centos5
service_description /dev/hda1 Free Space
check_command check_nrpe!check_hda1
}
define service{
use generic-service
host_name Centos5
service_description Total Processes
check_command check_nrpe!check_total_procs
}
define service{
use generic-service
host_name Centos5
service_description Zombie Processes
check_command check_nrpe!check_zombie_procs
} Activate the linux-box-remote.cfg template:
# vi /usr/local/nagios/etc/nagios.cfg And add:
# Definitions for monitoring remote Linux machine
cfg_file=/usr/local/nagios/etc/objects/linux-box-remote.cfg Verify Nagios Configuration Files:
# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
Total Warnings: 0
Total Errors: 0 Restart Nagios:
# service nagios restart Check Nagios Monitoring server that the remote linux box was added and is being monitored !
TroubleShooting
NRPE ./configure error:
checking for SSL headers… configure: error: Cannot find ssl headers
Solution:
You need to install the openssl-devel package
# yum -y install openssl-devel CHECK_NRPE: Error – Could not complete SSL handshake
Solution:
This is most likely not a probem with SSL but rather with Xinetd access restrictions.
Check the following files:
/etc/xinetd.d/nrpe
/etc/hosts.allow
/etc/hosts.deny
no acceptable c compiler found in $PATH
When I gave the ./configure command i got this error saying: no acceptable c compiler found in $PATH and then it stops.
After a quick google search I found a topic saying that i needed to install gcc so i entered:
yum install gcc glibc glibc-common gd gd-devel
(thanks to AgentOOX)
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