How to Install a Production Ready Naemon Monitoring Server-Arnold

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　　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.
[root@naemon ~]# sestatus　　
SELinux status:                 disabled
　　
[root@naemon ~]#
　　Installing the repo:
　　[root@naemon ~]# 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:
　　[root@naemon ~]# yum install naemon*
　　Naemon uses the same Nagios plugin and nrpe to monitor hosts. We will now install them:
　　[root@naemon ~]# yum install nagios-plugins nagios-plugins-all nagios-plugins-nrpe nrpe -y
　　We will add the firewall rules:
   [root@naemon ~]# firewall-cmd --add-service=http --permanent　　
success
　　
[root@naemon ~]# firewall-cmd --add-service=https --permanent
　　
success
　　
[root@naemon ~]# firewall-cmd --reload
　　
success
　　
[root@naemon ~]# 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:
　　

　　
[root@naemon ~]#
　　Installation of pnp4nagios.
　　yum install gcc-c++ rrdtool perl-Time-HiRes perl-rrdtool php-gd php php-cli wget
　　Downloading pnp4nagios.
[root@naemon ~]# wget https://svwh.dl.sourceforge.net/project/pnp4nagios/PNP-0.6/pnp4nagios-0.6.25.tar.gz　　
    [root@naemon ~]# tar -zxvf pnp4nagios-0.6.25.tar.gz
　　
    [root@naemon ~]# cd pnp4nagios-0.6.25/
　　
[root@naemon pnp4nagios-0.6.25]# ./configure --with-nagios-user=naemon --with-nagios-group=naemon
　　
[root@naemon pnp4nagios-0.6.25]# make all
　　
[root@naemon pnp4nagios-0.6.25]# make fullinstall
　　
[root@naemon pnp4nagios-0.6.25]# make install-webconf
　　
[root@naemon pnp4nagios-0.6.25]# make install-config
　　
[root@naemon pnp4nagios-0.6.25]# make install-init
　　Restarting and enabling the service.
    [root@naemon ~]# systemctl enable httpd && systemctl restart httpd　　
[root@naemon ~]# systemctl enable naemon && systemctl restart naemon
　　
[root@naemon ~]# systemctl enable thruk && systemctl restart thruk
　　
[root@naemon ~]# 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:
　　[root@naemon ~]# 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:
　　[root@centos6 ~]# yum install nagios-plugins nagios-plugins-all nagios-plugins-nrpe nrpe -y
　　Take a backup of the nrpe.cfg:
　　[root@centos6 ~]# cp /etc/nagios/nrpe.cfg /etc/nagios/nrpe.cfg.bkp
　　Replace the content of the nrpe.conf file with the below content:
[root@centos6 ~]# 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/
　　

　　
[root@centos6 ~]#
　　Under allowed_host add the naemon server ipaddress here it is 192.168.1.170.
　　Now we need to restart the nrpe service:
[root@centos6 ~]# service nrpe restart　　[root@centos6 ~]# 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:
　　[root@ubuntu ~]# 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
[root@naemon ~]# /usr/lib64/nagios/plugins/check_nrpe -H 192.168.1.182　　
NRPE v2.15
　　
[root@naemon ~]# /usr/lib64/nagios/plugins/check_nrpe -H 192.168.1.21
　　
NRPE v2.15
　　
[root@naemon ~]#
[root@naemon ~]# /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
　　
[root@naemon ~]#
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
  [root@centos6 ~]# cat /etc/nrpe.d/base.cfg　　
command[check_disks]=/usr/lib64/nagios/plugins/check_disk -w $ARG1$ -c $ARG2$ -p $ARG3$
　　
command[check_disk]=/usr/lib64/nagios/plugins/check_disk -X nfs -X cifs -X none -X tmpfs -w $ARG1$ -c $ARG2$
　　
command[memory]=/usr/lib64/nagios/plugins/check_memory -w $ARG1$ -c $ARG2$
　　
command[load]=/usr/lib64/nagios/plugins/check_load -w $ARG1$ -c $ARG2$
　　
command[check_total_procs]=/usr/lib64/nagios/plugins/check_procs -w $ARG1$ -c $ARG2$
　　
command[check_procs_c]=/usr/lib64/nagios/plugins/check_procs -c $ARG1$ -C $ARG2$
　　
command[check_procs_a]=/usr/lib64/nagios/plugins/check_procs -c $ARG1$ -a $ARG2$
　　Save and restart the file, then restart nrpe.
[root@centos6 ~]# /etc/init.d/nrpe restart　　
Shutting down nrpe:                                        [FAILED]
　　
Starting nrpe:                                             [  OK  ]
　　
[root@centos6 ~]#
　　Memory plugin will not be available as default plugin. We will use the below plugin.
[root@centos6 ~]# cd  /usr/lib64/nagios/plugins/　　
[root@centos6 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 () {
　　
        print