Change hostname in Linux
Here are some methods to change hostname for a certain Linux system.
One-time Change
Side effect, ineffective after reboot
hostname {NEW host name}
Permanently Change
1 revise /etc/hosts
127.0.0.1 localhost {NEW host name}
2 revise /etc/sysconfig/network
HOSTNAME={NEW host name}
Using hostnamectl
hostnamectl set-hostname NAME