[Linux] How to Change Hostname

I’ll introduce how to change the hostname in Linux.

As an example, let’s say we want to set the server hostname to codenote.net.

Add hostname to /etc/hosts

# vim /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4

↓（Add）

127.0.0.1   codenote.net localhost localhost.localdomain localhost4 localhost4.localdomain4

Change HOSTNAME in /etc/sysconfig/network

# vim /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=localhost.localdomain

↓（Change）

NETWORKING=yes
HOSTNAME=condenote.net

Apply hostname settings

If there are no particular issues, let’s restart the server.

# reboot -h now

If you don’t mind the console hostname, just restarting the network is OK.

# service network restart

That’s all from the Gemba.