Installing and Configuring Nagios

In Lab 8: Installing and Configuring Nagios, participants typically focus on the installation and initial configuration of Nagios, an open-source monitoring and alerting tool. This lab involves setting up the Nagios server, configuring essential parameters such as host definitions and service checks, and integrating plugins to monitor various aspects of the IT infrastructure. Participants may also explore the web interface for visualization and analysis of monitoring data. The lab aims to provide hands-on experience in deploying Nagios, enabling participants to establish a robust monitoring system for tracking the health and performance of network devices, servers, and services. Successful completion of Lab 8 equips participants with the skills to implement effective monitoring solutions using Nagios in their IT environments.

Lab:

Step 1: Disable SELinux

sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
setenforce 0
sestatus

Step 2: Install required Packages

yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
yum install wget php gcc glibc-common gd gd-devel make net-snmp perl perl-devel openssl

Step 3: Download package

wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.4.tar.gz

Step 4: Extract the package

tar -xvf nagios-4.4.4.tar.gz

Step 5: Create and user and Group

groupadd nagcmd
useradd -g nagcmd nagios 
usermod -aG nagcmd apache  
groupadd nagios
usermod -aG nagios nagios
id nagios 

Step 6: Compile the package

cd nagios-4.4.4
./configure --with-command-group=nagcmd 
make all
make install
make install-init
make install-commandmode
make install-config
make install-exfoliation

Step 7: Create nagiosadmin user and password for web console access. Enable and Start Services.

htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
systemctl status httpd
systemctl start httpd
systemctl enable httpd
systemctl start nagios
systemctl enable nagios
systemctl status httpd
systemctl status nagios

Step 8: Download and install Nagios plugins

cd /tmp  
wget https://nagios-plugins.org/download/nagios-plugins-2.3.3.tar.gz  
tar -xvf nagios-plugins-2.3.3.tar.gz  
cd nagios-plugins-2.3.3  
./configure –with-nagios-user=nagios –with-nagios-group=nagios  
make  
make install  
cd /usr/local/nagios/libexec/  
ls  
cd /root/nagios-4.4.4  
ls  
make install-webconf  
systemctl restart httpd

Step 9: Login to Web Console

Step 10: After successful installation of plugins, you can see all services checks completes normally