To change centos host name permanantly without restart
/etc/sysconfig/network
# sudo nano /etc/sysconfig/network
HOSTNAME=myserver.domain.com
/etc/hosts
127.0.0.1 localhost localhost.localdomain
192.168.0.20 hostname.domain.com hostname
~
~
~
~
:wq!
Restart network using below command
# /etc/init.d/network restart
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