Nagios Installation on Amazon Linux EC2

Welcome, This repository provides a comprehensive guide to installing Nagios on an Amazon Linux EC2 instance. Whether you’re a seasoned sysadmin or a newcomer devops engineer to monitoring systems, this guide will help you set up Nagios efficiently and effectively.

About Nagios

Nagios is a powerful open-source monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes. With Nagios, you can monitor your entire IT infrastructure, detect problems before they occur, and ensure that your systems, applications, services, networks and business processes are functioning properly.

Prerequisites

• An Amazon Linux EC2 instance
• SSH access to the instance
• sudo privileges
• Ensure your EC2 instance’s security group allows inbound traffic on port 80 (HTTP)

Installation Steps

1. Update the System

   yum update -y

2. Install Prerequisite Software Install Apache, PHP, and other required libraries

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

3. Create account information, you need to setup a Nagios user

   adduser -m nagios

   passwd nagios

   *Now it will ask to enter new password and provide any*
   

4. Now to add group enter these commands

   groupadd nagioscmd

   usermod -a -G nagioscmd nagios

   usermod -a -G nagioscmd apache

5. Download and Install Nagios Core and plugins, now create directories to store the downloaded files

   mkdir ~/downloads

   cd ~/downloads

6. Download the source code tarballs of both nagios and the plugins

   wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.6.tar.gz

   wget https://nagios-plugins.org/download/nagios-plugins-2.3.3.tar.gz

7. Extract the nagios source code tarball and install

   tar -zxvf nagios-4.4.6.tar.gz

   cd nagios-4.4.6

8. Run the configuration script with the name of the group which you have created in above step

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

9. Install binaries, init script, sample config files and set permission on the external command directly

   make all

   make install

   make install-init

   make install-config

   make install-commandmode

10. ---Optional--- You can customize the configuration (e.g. email)

    vim /usr/local/nagios/etc/objects/contacts.cfg

11. Configure the web interface

    make install-webconf

12. Create a nagiosadmin account for login into the nagios web interface & set password

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

13. Restart service

    service httpd restart

14. Compile and install the nagios plugins. Extract the nagios plugins. Source code tarball

    cd ~/downloads

    tar -zxvf nagios-plugins-2.3.3.tar.gz

    cd nagios-plugins-2.3.3

15. Configure and install the nagios plugins

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

    make

    make install

16. Enable and start the Nagios service

    systemctl enable httpd

    systemctl start httpd

    systemctl enable nagios

    systemctl start nagios

17. Verify the sample nagios configuration files (Optional)

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

18. You can now start NAGIOS

    service nagios start

    service httpd restart

19. Now copy the public IP of your ec2 instance and paste the URL on your browser like this ( 12.1.1.1/nagios )

20. Provide your username & password your set earlier then goooo.

Contributions are welcome! Feel free to fork this repository, make improvements, and submit pull requests. Your contributions will help others and enhance the quality of this guide. And if you find this helpful, send me a star ⭐ on GitHub. Your support will be appreciated very much!!!