How to fix cPanel Install : Installation Error – Invalid Hostname

You can check hostname by inspecting the content of /etc/hostname file using the command:

cat /etc/hostname

In order to change or set a CentOS 7 machine hostname, use the hostnamectl command as shown in the below command excerpt.

hostnamectl set-hostname your-new-hostname

Use the following command to restart networking on your server to ensure
that changes persist on restart:

/etc/init.d/network restart

Now try to install cPanel.

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