Nagios setup

Nagios setup

Nagios workflow

Step1:

launch kvm vm and login with ncodeitadm

First install centos in your laptop
Next install kvm in centos and create a bridge network
After creating a bridge open virt-manager and configure the vm by selecting the required image file qcow2
After creating vm open terminal and login with username and password
Username: ncodeitadm
Password: ncodeit123
commands :

1	# virt-manager

1	# brctl show to check the bridge

Step2:

check connectivity
you need to check for ip address
command:

1

ip a

After getting the ip-address

1	# ping google.com

Step3:  Nagios installation

1	yum -y install httpd php gcc glibc glibc-common wget perl gd gd-devel unzip zip

#this command will install all the pre requisites for the VM

1	useradd nagios

1	groupadd nagcmd

1	usermod -a -G nagcmd nagios

1	usermod -a -G nagcmd apache

#adding a user and a group

Step4:

1

cd /tmp/

1	wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.3.4.tar.gz

# downloading nagios version 4.3.4 and extract it with tar as below

1	tar -zxvf /tmp/nagios-4.*.tar.gz

1	cd /tmp/nagios-4.*

#navigate to the extracted folder

1	./configure --with-nagios-group=nagios --with-command-group=nagcmd

1

make all

1	make install

1	make install-init

1	make install-config

1	make install-commandmode

1	make install-webconf

1	make install-exfoliation

# make installing

1	htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

1	systemctl restart httpd

1	systemctl enable httpd

# restart and enable apache server

1	cat /usr/local/nagios/etc/objects/contacts.cfg

Step5:

1

cd /tmp

1	wget https://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz

# download a nagios plugin and extract it

1	tar -zxvf /tmp/nagios-plugins-*.tar.gz

1	cd /tmp/nagios-plugins-*/

1	./configure --with-nagios-user=nagios --with-nagios-group=nagios

1

make

1	make install

#make installing

Step6:

1	/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

1	systemctl start nagios

1	chkconfig nagios on

1	getenforce

1	setenforce 0

open browser IP/nagios/

username=nagiosadmin  password=ncodeit123

Step7:

ssh root@ip of others

1	yum install epel-release -y

1	yum install nrpe nagios-plugins-all -y

1	vi /etc/nagios/nrpe.cfg

1

#add ip of server at

allowed_hosts=127.0.0.1,<server ip address>

1	systemctl start nrpe

1	systemctl enable nrpe

#starting and enabling nrpe

Step8:  It is performed in the server side.

1	mkdir -p /usr/local/nagios/etc/servers

1	sudo vi /usr/local/nagios/etc/nagios.cfg

_{uncomment cfg_dir=/usr/local/nagios/etc/server}

1	sudo vi /usr/local/nagios/etc/servers/clients.cfg

define host{
use                        linux-server
host_name                 your-host-name
alias                     your-host-name
address                    Server IP
max_check_attempts         5
check_period               24×7
notification_interval      30
notification_period        24×7
}

define service{
use                   generic-service
host_name             your-host-name
service_description   SSH
check_command         check_ssh
notifications_enabled 1
}

#edit hostname and IP to your configuration

Step9:

1	systemctl restart nagios

go to nagios browser and left side cilck on services—select ssh