There are two ways to install Nagios XI manually on linux server.
Way 1:
Run the following command on your linux machine. This one command will download and run Nagios XI in your machine.
curl https://assets.nagios.com/downloads/nagiosxi/install.sh | sh
Way 2:
This is the way to download and install nagios step by step.
$ cd /tmp
$ wget https://assets.nagios.com/downloads/nagiosxi/xi-latest.tar.gz
$ tar xzf xi-latest.tar.gz
$ cd nagiosxi/
$ ./fullinstall
Once you are done with installation, whichever way you choose
Follow the below steps to finish your installation process
Navigate to the user interface by using following URL
You will see the screen like this
Click the Access nagiosXI button to begin this
Give the general settings according to your location and then click next
This page is for Admin account details
Give the password and mail
If you want notification from Nagios XI tick the checkbox in notification settings
And then click on finish install to save all settings.
Finally Installation complete screen will show your Username and Password to login to your nagiosXi server.
Click the Login to Nagios XI button to start your experience with nagioXI