How to Install Nagios on Linux RHEL/CentOS 8

Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems Nagios monitoring tool run on the Linux operating system and you can monitor devices running Linux, Windows and Unix operating systems. that provide a web-based graphical user interface (GUI).

Step: Installation Nagios monitoring tool

• Install require package (Ex: https, php, gcc glibc glibc-common etc…)
• Create User and group
• Downloads Nigios package and plaguing
• Install configure package and compile
• Set login user and password
• Install configure plaguing and compile
• Verify install package
• Troubleshooting Command ( if not open web GUI interface )
• Additional Configuration

Step 1: Install require package

Use “sudo su” command for change administrator mode

# sudo su

# yum install httpd php
# yum install gcc glibc glibc-common
# yum install gd gd-devel

Step 2: Create User and group

Use both command for create nagios user and set password

# adduser -m nagios
# passwd nagios

Create group and add nagios, apache user of that group

# groupadd nagioscmd

# usermod -a -G nagioscmd nagios
# usermod -a -G nagioscmd apache

Step 3: Downloads Nigios package and plaguing

Create and change directory for package and plaguing download

# mkdir ~/downloads
# cd ~/downloads

Use ” wget” for download package and plaguing

# wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.5.tar.gz
# wget https://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz

step 4: Install configure package and compile

Use those command for extract file and change directory

# tar zxvf nagios-4.0.8.tar.gz
# cd nagios-4.0.8

Install configuration package

# ./configure –with-command-group=nagioscmd

Use “make ” command for compile configuration package

# make all
# make install
# make install-init
# make install-config
# make install-commandmode
# make install-webconf

Step 5 : Set login user and password

# htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
# service httpd restart

# cd ~/downloads

Step 6: Install configure plaguing and compile

Use those command for extract file and change directory

# tar zxvf nagios-plugins-2.0.3.tar.gz
# cd nagios-plugins-2.0.3

Install configuration plaguing

# ./configure –with-nagios-user=nagios –with-nagios-group=nagios

Use “make ” command for compile configuration package

# make
# make install

enable boot time Use “chkconfig or systemctl” command

# chkconfig –add nagios
# chkconfig nagios on
————OR————–
# systemctl enable nagios

Step 7: Verify install package

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

Restart or start Nagios and http services

# service nagios start
# service httpd restart

Finally, you can login nagios web GUI interface on browser ( open: chrome )

http://192.168.1.10/nagios
user Name: nagiosadmin
password: “which have you set”

Troubleshooting Command

POSSIBLE ERRORS:**If Nagios web interface not working then following those step other wish can skip.

“/usr/local/nagios” are nagios Home files location

# ls -al /usr/local/nagios
# ls -alR /usr/local/nagios/var
—-Output—-
SELINUX:
setenforce 0

Plaguing location

# cd /usr/local/nagios/libexec/

Can’t access web page? Check firewalld and at port 80 through.

# firewall-cmd –zone=public –add-port=80/tcp –permanent
# firewall-cmd –reload

Still can’t access web page? Check IPV6 listening in the apache configuration.

# vi /etc/httpd/conf/httpd.conf
—— check and set ——-
Listen 0.0.0.0:80

# service httpd restart

Additional Configuration

If want to change contract details

# vi /usr/local/nagios/etc/objects/contacts.cfg

host machine add

# vi /usr/local/nagios/etc/objects/localhost.cfg
——–add Host ———

define host {
use linux-server
host_name localhost
alias localhost
address 127.0.0.1
}

———add services at last ———-

define service{
use local-service
host_name ftpserver.com
service_description FTP
check_command check_ftp
notifications_enabled 0
}

HOST DEFINITION

ADD SERVICE

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