Install Nagios on CentOS
Install Nagios on CentOS

In this tutorial, we will show you how to install Nagios on CentOS 7. Nagios is a powerful open-source enterprise-class software that monitors network infrastructures, servers, and applications. It can be used to monitor Linux and Windows servers as well as web applications, Linux and Unix applications and Windows applications. Some of the features include parallelized service checks, plugin system, notifications via email, pager or user-defined service, a web interface for viewing status, log files, problem history and notifications and much more.

Update your CentOS 7 server and install the necessary packages

Log in to your VPS via SSH as a sudo user:

ssh [email protected]_Address

Once you are logged in, issue the following commands to make sure all installed packages are up to date:

sudo yum update

Next, install the pre-requisite packages necessary for building Nagios with the following command:

sudo yum install gcc glibc glibc-common wget unzip httpd php gd gd-devel perl postfix

Install Apache, MariaDB and PHP 7

To install Nginx, MariaDB PHP 7 and all the necessary PHP modules on your CentOS server run the following command:

sudo yum install httpd mariadb-server php php-mysql

When the MariaDB installation is complete, run the following command to secure your MariaDB installation:

sudo mysql_secure_installation

Enable MariaDB and Apache to start on boot with:

sudo systemctl enable httpd.service
sudo systemctl enable mariadb.service

Recommended Reading: How to Install Webmin on CentOS 7

Download and Install Nagios

Download the latest stable version of the Nagios tar archive in the /tmp directory on your server with:

wget https://github.com/NagiosEnterprises/nagioscore/archive/nagios-4.4.1.tar.gz -O /tmp/nagioscore.tar.gz

When the download is completed the change to the tmp directory extract the archive with the following commands:

cd /tmp
sudo tar xf nagioscore.tar.gz

Once the Nagios Plugins archive is extracted, change to the nagioscore-nagios-4.4.1 directory:

cd /tmp/nagioscore-nagios-4.4.1

Next step is to run the ./configure script which will check your system for missing libraries and binaries and prepare the Nagios source code for the build process:

./configure

Now that the configuration is completed start the compilation process using the make all command:

make all

Run the following command to create the nagios user and group and add apache to the nagios group:

sudo make install-groups-users
sudo usermod -a -G nagios apache

The next step is to install Nagios using the make install command:

sudo make install

Run the following command to install the Nagios sample configuration files:

sudo make install-config

Install the initialization script so that you can manage your Nagios service using the systemctl command :

sudo make install-daemoninit

Next, install the Apache webserver configuration files with:

sudo make install-webconf

Restart apache service:

sudo systemctl restart httpd

Use the htpasswd command to create a user account called nagiosadmin

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

Run the following command to install and configure the external command file:

sudo make install-commandmode

Install Nagios Plugins

Before downloading and compiling Nagios plugins install the following dependencies:

sudo yum install gcc glibc glibc-common make gettext automake autoconf wget openssl-devel net-snmp net-snmp-utils epel-release perl-Net-SNMP

Download the latest stable version of the Nagios tar archive in the /tmp directory on your server with:

wget --no-check-certificate -O /tmp/nagios-plugins.tar.gz https://github.com/nagios-plugins/nagios-plugins/archive/release-2.2.1.tar.gz

When the download is completed the change to the tmp directory extract the archive with the following commands:

cd /tmp
sudo tar xf nagios-plugins.tar.gz

Once the Nagios Plugins archive is extracted, change to the nagioscore-nagios-4.4.1 directory:

cd /tmp/nagios-plugins-release-2.2.1/

The following commands will check your system for missing libraries and binaries and prepare the Nagios Plugins source code for the build process:

./tools/setup
./configure

Once the configuration is completed start the compilation process using the make command:

make

Finally, install the Nagios Plugins using the make install command:

sudo make install

Access Nagios

Now that you have both Nagios and Nagios Plugins installed on your CentOS system, start the Nagios service with the following command:

systemctl start nagios

Open your browser and navigate to http://your-domain-or-ip/nagios and you will be presented with the login pop-up.

Enter the login credentials that you created earlier with the htpasswd command and you will be redirected to the Nagios home page as shown on the image below:

That’s it. You have successfully installed Nagios on CentOS 7. For more information about how to manage your Nagios installation, please refer to the official Nagios documentation.

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