Changing your server hostname must be the first step you do when you're getting a new installation for a webserver or control panel. here's how we can change simply it.
Centos6
You could change the hostname by this simple command
# hostname host.name.com
which is host.name.com is the hostname you want to set
Centos7
on this OS it's a little bit complicated
# sudo nano /etc/sysconfig/network
then you have to write this line on the file
HOSTNAME=host.name.com
then save and exit
You may need to restart the network on server/machine though this command
# /etc/init.d/network restart
#reboot
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Don't forgot to add your hostname to hosts file, by the following command
# nano /etc/hosts
xxx.xxx.xxx.xxx host.name.com
the ip of the server followed by the hostname then save the exit the file
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