Linux Rename host name

First, view the Linux host name
[Root@localhost ~]# hostname
Localhost.localdomain

Second, rename the hostname (take HADOOP1 as the new host name for example)
The first step:
[Root@localhost ~]# hostname HADOOP1
Step Two: Modify the/etc/sysconfig/network configuration file so that the next time you restart, use the new host name
Edit/etc/sysconfig/network file, modify Hostname=hadoop1
The third step: Modify the local domain name resolution file/etc/hosts, so that the native application can resolve the new host name
127.0.0.1 hadoop1 localhost
:: 1 hadoop1 localhost

Linux Rename host name