How to modify the host name hostname of CentOS

Change host name permanently

Open/etc/sysconfig/network

HOSTNAME = localhost. localdomain modify localhost. localdomain to your host name.

The code is as follows:

/Etc/hosts

127.0.0.1 localhost. localdomain localhost. Here, 127.0.0.1 is the local loop address, and localhost. localdomain is the host name (hostname), that is, what you want to modify. Localhost is the alias of the host name (alias). It appears at the Konsole prompt. Modify the second item to your host name. The third item is optional.

Temporarily modify host name

Show host name:

Oracle @ localhost :~ $ Hostname
Localhost
Modify host name:

Oracle @ localhost :~ $ Sudo hostname orcl1
Oracle @ localhost :~ $ Hostname
Orcl1