Method of changing host name (permanent)

Two methods of modifying host names
1、 Method 1 ： Use hostnamectl command

# Permanently set the user name , No failure after shutdown

[[email protected] ~]# hostnamectl set-hostname datbase
[[email protected] ~]# hostname
database

    1
    2
    3

2、 Method 2 ： Modify the configuration file /etc/hostname Save and exit

Get into vi, Delete old hostname , Enter the new host name ,Esc Post colon wq Exit save
[[email protected] ~]# vi /etc/hostname database    
Restart and take effect
[[email protected] ~]#reboot