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
In addition to hostname command you can also use hostnamectl command to display a Linux machine hostname.
# hostnamectl
In order to apply the new hostname, a system reboot is required, issue one of the below commands in order to reboot a CentOS 7 machine.
# init 6 # systemctl reboot # shutdown -r
