Nagios

Nagios:

What is it?

Nagios is like a watchful guardian for computer systems. Imagine it as a superhero for your servers and devices.

What does it do?

It keeps a close eye on all the important things happening in your computer world. Is your server working well? Is your website up? Is your email service running smoothly? Nagios answers these questions.

How does it work?

Nagios regularly checks in with your devices and services. It asks, "Hey, are you okay?" If everything is fine, great! If there's a problem, Nagios raises an alarm, like a superhero sensing trouble.

Why is it useful?

It helps you avoid disasters. If something is about to go wrong, Nagios warns you so you can fix it before it becomes a big issue. It's like having a superhero sidekick that gives you a heads-up when trouble is brewing.

In simple terms, Nagios is your digital superhero, always watching over your computer systems to make sure everything is running smoothly. If anything goes wrong, it lets you know before it becomes a big problem.

sudo su
yum install httpd php
yum install gcc glibc glibc-common
yum install gd gd-devel

adduser -m nagios
passwd nagios

groupadd nagioscmd
usermod -a -G nagioscmd nagios
usermod -a -G nagioscmd apache

mkdir ~/downloads
cd ~/downloads


wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.8.tar.gz
wget http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz

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

./configure --with-command-group=nagioscmd
make all


make install
make install-init
make install-config
make install-commandmode


make install-webconf

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


cd ~/downloads
tar zxvf nagios-plugins-2.0.3.tar.gz
cd nagios-plugins-2.0.3

./configure --with-nagios-user=nagios --with-nagios-group=nagios
make
make install


chkconfig --add nagios
chkconfig nagios on

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
(If above command not run properly then need to follow below steps :)


sudo mkdir -p /usr/local/nagios/var/spool/checkresults
sudo chown -R nagios:nagios /usr/local/nagios/var/spool/checkresults
check_result_path=/usr/local/nagios/var/spool/checkresults
sudo service nagios restart
sudo systemctl restart nagios


service nagios start
service httpd restart

Heyyyy!!!!! Below is the snippet for successfully execution.

Use public ip with 43.205.214.90/nagios/

It will ask for username and Password enter the details which you have created for me I have used username as nagiosadmin and enter the password. A Nagios monitoring page will open which will monitor all your server and its condition.

Reffered from https://www.youtube.com/watch?v=H9uRoLS_8ks for complete video for this. Thank You!!!!!