How to Install a Production Ready Naemon Monitoring Server-Arnold
Naemon is the new monitoring suite that aims to be fast, stable and innovative while giving you a clear view of the state of your network and applications.This is a replacement for nagios server and very stable and uses an amazing dashboard called thruk. Setting up naemon is very easy and has live status inbuild .In this tutorial, I will show you how to install and configure naemon in a production environment along with pnp4nagios for graphs. Naemon is very stable, I will show you how to maintain the configs in a large scale environment.In this tutorial, I will be using four Servers
[*] 192.168.1.170 - Naemon Server - centos 7
[*] 192.168.1.21 - nrpe client - centos 6
[*] 192.168.1.182 - nrpe client - ubuntu
[*] 192.168.1.75 - nscp client - windows server 2012R2
Installation of Naemon Server
I am using a CentOS 7 host with a minimal installation, SELinux disabled and firewalld enabled.
# sestatus
SELinux status: disabled
#
Installing the repo:
# yum -y install https://labs.consol.de/repo/stable/rhel7/x86_64/labs-consol-stable.rhel7.noarch.rpm
enabling the epel repo:
yum -y install epel-release
Installing the Naemon package:
# yum install naemon*
Naemon uses the same Nagios plugin and nrpe to monitor hosts. We will now install them:
# yum install nagios-plugins nagios-plugins-all nagios-plugins-nrpe nrpe -y
We will add the firewall rules:
# firewall-cmd --add-service=http --permanent
success
# firewall-cmd --add-service=https --permanent
success
# firewall-cmd --reload
success
# firewall-cmd --list-all
public (active)
target: default
icmp-block-inversion: no
interfaces: eno16777736
sources:
services: dhcpv6-client http https ssh
ports:
protocols:
masquerade: no
forward-ports:
sourceports:
icmp-blocks:
rich rules:
#
Installation of pnp4nagios.
yum install gcc-c++ rrdtool perl-Time-HiRes perl-rrdtool php-gd php php-cli wget
Downloading pnp4nagios.
# wget https://svwh.dl.sourceforge.net/project/pnp4nagios/PNP-0.6/pnp4nagios-0.6.25.tar.gz
# tar -zxvf pnp4nagios-0.6.25.tar.gz
# cd pnp4nagios-0.6.25/
# ./configure --with-nagios-user=naemon --with-nagios-group=naemon
# make all
# make fullinstall
# make install-webconf
# make install-config
# make install-init
Restarting and enabling the service.
# systemctl enable httpd && systemctl restart httpd
# systemctl enable naemon && systemctl restart naemon
# systemctl enable thruk && systemctl restart thruk
# systemctl enable npcd && systemctl restart npcd
you should be able to access the URL from http://192.168.1.170/thruk
The default username is thrukadmin, password is thrukadmin.
In case you want to change the thrukadmin password, run:
# htpasswd /etc/thruk/htpasswd thrukadmin
Installation of Monitoring Client to monitor the nodes
Installation of nrpe clients for monitoring Linux hosts
192.168.1.21 - nrpe client - centos 6
Installation of the Nagios plugin and nrpe client:
# yum install nagios-plugins nagios-plugins-all nagios-plugins-nrpe nrpe -y
Take a backup of the nrpe.cfg:
# cp /etc/nagios/nrpe.cfg /etc/nagios/nrpe.cfg.bkp
Replace the content of the nrpe.conf file with the below content:
# cat /etc/nagios/nrpe.cfg
log_facility=daemon
pid_file=/var/run/nrpe/nrpe.pid
nrpe_user=nrpe
nrpe_group=nrpe
allowed_hosts=127.0.0.1,192.168.1.170
dont_blame_nrpe=1
debug=0
command_timeout=60
connection_timeout=300
include_dir=/etc/nrpe.d/
#
Under allowed_host add the naemon server ipaddress here it is 192.168.1.170.
Now we need to restart the nrpe service:
# service nrpe restart # chkconfig nrpe on
192.168.1.182 - nrpe client - ubuntu
root@ubuntu:~# apt-get install nagios-nrpe-server nagios-plugins -y
Take a backup of the nrpe.cfg:
# cp /etc/nagios/nrpe.cfg /etc/nagios/nrpe.cfg.bkp
Replace the content of the nrpe.conf file with the below content:
root@ubuntu:~# cat /etc/nagios/nrpe.cfg
log_facility=daemon
pid_file=/var/run/nagios/nrpe.pid
nrpe_user=nagios
nrpe_group=nagios
allowed_hosts=127.0.0.1,192.168.1.170
dont_blame_nrpe=1
debug=0
command_timeout=60
connection_timeout=300
include_dir=/etc/nagios/nrpe.d/
root@ubuntu:~#
Now we need to restart the nrpe service:
root@ubuntu:~# systemctl restart nagios-nrpe-server.service root@ubuntu:~# systemctl enable nagios-nrpe-server.service
Installation of Nscp on Windows
192.168.1.75 - nscp client - windows server 2012R2
Download nscp from this website:
https://www.nsclient.org/download/
Once downloaded, please follow the installation screenshots
Choose generic.
Choose complete:
Choose the default path:
Now, under allowed hosts, please add the naemon host. Here in our setup it is 192.168.1.170.
Make sure you give a complex password. For this example, I have used the password as "howtoforge". Next check enable nsclient and nrpe.
Once the installation is complete, please make sure the service is up and running.
We will now validate from naemon host, to make sure we are able to reach it.
Validate nrpe and nscp from Naemon Server to check the connectivity
# /usr/lib64/nagios/plugins/check_nrpe -H 192.168.1.182
NRPE v2.15
# /usr/lib64/nagios/plugins/check_nrpe -H 192.168.1.21
NRPE v2.15
#
# /usr/lib64/nagios/plugins/check_nt -H 192.168.1.75 -p 12489 -v CLIENTVERSION -s 'howtoforge'
NSClient++ 0.5.0.62 2016-09-14
#
Monitoring of Servers
We will monitor the server's performance in this tutorial.
In a production environment, we will need to monitor the CPU , memory and harddisk utilization, along with the host alive check.
Adding the following lines in nrpe conf /etc/nrpe.d/base.cfg
192.168.1.21 - nrpe client - centos 6
# cat /etc/nrpe.d/base.cfg
command=/usr/lib64/nagios/plugins/check_disk -w $ARG1$ -c $ARG2$ -p $ARG3$
command=/usr/lib64/nagios/plugins/check_disk -X nfs -X cifs -X none -X tmpfs -w $ARG1$ -c $ARG2$
command=/usr/lib64/nagios/plugins/check_memory -w $ARG1$ -c $ARG2$
command=/usr/lib64/nagios/plugins/check_load -w $ARG1$ -c $ARG2$
command=/usr/lib64/nagios/plugins/check_procs -w $ARG1$ -c $ARG2$
command=/usr/lib64/nagios/plugins/check_procs -c $ARG1$ -C $ARG2$
command=/usr/lib64/nagios/plugins/check_procs -c $ARG1$ -a $ARG2$
Save and restart the file, then restart nrpe.
# /etc/init.d/nrpe restart
Shutting down nrpe:
Starting nrpe:
#
Memory plugin will not be available as default plugin. We will use the below plugin.
# cd/usr/lib64/nagios/plugins/
# vim check_memory
Add the below content.
#! /usr/bin/perl -w
##Included Perf data
#The nagios plugins come with ABSOLUTELY NO WARRANTY. You may redistribute
#copies of the plugins under the terms of the GNU General Public License.
#
use strict;
use Getopt::Long;
my ($opt_f, $opt_h, $opt_c, $opt_w);
my ($result, $message, $ram_percent);
my $PROGNAME="check_memory";
$opt_f = "";
Getopt::Long::Configure('bundling');
GetOptions(
"h" => \$opt_h, "help" => \$opt_h,
"c=s" => \$opt_c, "Warning_Percentage"=> \$opt_c,
"w=s" => \$opt_w, "Critical_Percentage" => \$opt_w,
);
if ($opt_h) {
&print_help();
exit 0;
}
$opt_w = shift unless ($opt_w);
$opt_c = shift unless ($opt_c);
if (! $opt_c && ! $opt_w) {
print "Warning and Critical must be specified\n";
exit 3;
}
if ($opt_c$opt_c){
print "Memory usage is: CRITICAL: ${ram_percent}% used | used=$ram_percent;$opt_w;$opt_c\n";
exit 2;
}elsif ($ram_percent > $opt_w) {
print "Memory usage is: WARNING: ${ram_percent}% used | used=$ram_percent;$opt_w;$opt_c\n";
exit 1;
}
else{
print "Memory usage is: $result: ${ram_percent}% used | used=$ram_percent;$opt_w;$opt_c\n";
exit 0;
}
sub print_usage () {
print "Usage:\n";
print "$PROGNAME -f\n";
print "$PROGNAME -c\n";
print "$PROGNAME -w\n";
print "$PROGNAME [-h | --help]\n";
print "$PROGNAME [-V | --version]\n";
}
sub print_help () {
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