How do i install Nagios on Ubuntu?

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How do i install Nagios on Ubuntu?
Feb 26 in DevOps Tools by Kiran
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 Hey @Kiran, installing Nagios requires you to have apache and php installed. 

let's start with installing apache

sudo apt update
sudo apt install apache2

Install PHP

sudo apt install php php-cgi libapache2-mod-php php-common php-pear php-mbstring

Install nagios Server packages

sudo apt install nagios3 nagios-plugins-basic

The above command will prompt you to create a password for your Nagios account

Configure Nagios server

Go to sudo nano /etc/nagios3/nagios.cfg and make the following changes

# EXTERNAL COMMAND OPTION
# This option allows you to specify whether or not Nagios should check
# for external commands (in the command file defined below).  By default
# Nagios will *not* check for external commands, just to be on the
# cautious side.  If you want to be able to use the CGI command interface
# you will have to enable this.
# Values: 0 = disable commands, 1 = enable commands

check_external_commands=1

Open Nagios apache config file and limit the access from the localhost and local subnet

sudo nano /etc/nagios3/apache2.conf

Adjust Nagios folder permission

sudo chgrp -R www-data /var/lib/nagios3 
chmod 750 /var/lib/nagios3/rw

Restart Nagios and Apache

sudo systemctl restart nagios3.service
sudo systemctl restart apache2.service

Open browser with server hostname or IP address

https://localhost/server-ip

It'll prompt for username and password

Username- nagiosadmin

Password - Whatever you've created

answered Feb 26 by Riya

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