CentOS7 set host name and IP mapping

In a local area network, each machine has a host name to facilitate the distinction between host and host, so set the hostname for each machine to access each other in an easy to remember way. For example, we can name the function of each machine on the LAN

1. Set host name

To view the host name of this computer, use either of the following three commands

# hostname #
Uname-n #
Cat/proc/sys/kernel/hostname

Using the VI Editor to open/etc/hostname files

# Vi/etc/hostname

Delete the original content in the file, add content host Name: Master, save exit

Master

2. Set host name and IP mapping

Using the VI Editor to open/etc/hosts files

# vi/etc/hosts

Add content to the end of the file, format: IP address host name (separated by a space in the middle), save exit

192.168.242.130 Master

Restart the Network service after Setup completes

# systemctl Restart Network

Ping a host name by using the ping command

# ping Master

If you can ping, the setting is successful