Nagios is an awesome Open Source monitoring tool, its provides you more comprehensive monitoring environment to always keep an eye on your all machines / networks whether you are in a your data center or just your small labs.

With Nagios, you can monitor your remote hosts and their services remotely on a single window. It shows warnings and indicates if something goes wrong in your servers which eventually helps us to detect some problems before they occur. It helps us to reduce downtime and business losses.

Recently, Nagios released its latest versions Nagios Core 4.3.4 and its latest stable release of Nagios plugins 2.2.1 on April 19, 2017.

Aug 13, 2013 - In this how-to let us learn how to install NagVis add-on that can be used to. That (hopefully) includes RedHat, Fedora, CentOS, OpenSuSE.

This article is intended to guide you with easy instructions on how to install latest Nagios Core 4.3.4 from source (tarball) on RHEL 7.x/6.x/5.x, CentOS 7.x/6.x/5.x and Fedora 26-20 distributions.

Within 30 minutes you will be monitoring your local machine, no any advanced installation procedure only basic installation that will work 100% on most of the today’s Linux servers.

Please Note: The installation instructions were shown in here are written based on CentOS 7.2 Linux distribution.

Installing Nagios 4.3.4 and Nagios Plugin 2.2.1

If you follow these instructions correctly, you will end up with following information.

1. Nagios and its plugins will be installed under /usr/local/nagios directory.
2. Nagios will be configured to monitor few services of your local machine (Disk Usage, CPU Load, Current Users, Total Processes, etc.)
3. Nagios web interface will be available at http://localhost/nagios

Step 1: Install Required Dependencies

We need to install Apache, PHP and some libraries like gcc, glibc, glibc-common and GD libraries and its development libraries before installing Nagios 4.3.4 with source. And to do so, we can use yum default package installer.

Step 2: Create Nagios User and Group

Create a new nagios user and nagcmd group account and set a password.

Next, add both the nagios user and the apache user to the nagcmd group.

Step 3: Download Nagios Core 4.3.4 and Nagios Plugin 2.2.1

Create a directory for your Nagios installation and all its future downloads.

Now download latest Nagios Core 4.3.4 and Nagios plugins 2.2.1 packages with wget command.

Step 4: Extract Nagios Core and its Plugins

We need to extract downloaded package with tar command as follows.

Billy joel album. When you extract these tarballs with tar command, two new folders will appear in that directory.

Configure Nagios Core

Now, first we will configure Nagios Core and to do so we need to go to Nagios directory and run configure file and if everything goes fine, it will show the output in the end as sample output. Please see below.

Sample output:

After configuring, we need to compile and install all the binaries with make all and make install command, it will install all the needed libraries in your machine and we can proceed further.

Sample output:

Following command will install the init scripts for Nagios.

To make nagios work from command line we need to install command-mode.

Next, install sample nagios files, please run following command.

Sample output:

Step 5: Customizing Nagios Configuration

Open the “contacts.cfg” file with your choice of editor and set the email address associated with the nagiosadmin contact definition to receiving email alerts.

Sample Output

Step 6: Install and Configure Web Interface for Nagios

We are done with all configuration in the backend, now we will configure Web Interface For Nagios with following command. The below command will Configure Web interface for Nagios and a web admin user will be created “nagiosadmin”.

In this step, we will be creating a password for “nagiosadmin”. After executing this command, please provide a password twice and keep it remember because this password will be used when you login in the Nagios Web interface.

Restart Apache to make the new settings take effect.

Step 7: Compile and Install Nagios Plugin

We have downloaded nagios plugins in /root/nagios, Go there and configure and install it as directed below.

Step 8: Verify Nagios Configuration Files

Now we are all done with Nagios configuration and its time to verify it and to do so please insert following command. If everything goes smooth it will show up similar to below output.

Sample Output

Step 9: Add Nagios Services to System Startup

To make Nagios work across reboots, we need to add nagios and httpd with chkconfig and systemctl command.

On RHEL/CentOS 6/5 and Fedora

On RHEL/CentOS 7 and Fedora 19-26

Restart Nagios to make the new settings take effect.

Step 10: Login to the Nagios Web Interface

Your nagios is ready to work, please open it in your browser with “http://Your-server-IP-address/nagios” or “http://FQDN/nagios” and Provide the username “nagiosadmin” and password.

Nagios Web Dashboard

Host View

Nagios Host View

Nagios Overview

Service View

Nagios Hos Services Monitoring

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Process View

Congratulations! You’ve successfully installed and configured Nagios and its Plugins. You’ve just begin your journey into monitoring.

Upgrade Nagios 3.x to Nagios 4.3.4

If you are already running an older version of Nagios, you can upgrade it anytime. To do so, you just need to download the latest tar archive of it and configure it as shown below.

That’s it for now, in my upcoming articles, I will show you how to add Linux, Windows, Printers, Switches and Devices to Nagios monitoring Server. If you’re having any trouble while installing, please do contact us via comments. Till then stay tuned and connected to Tecmint and don’t forget to Like and Share us to spread around.

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