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How to Change Hostname in centos

$ vi /etc/sysconfig/network

NETWORKING=yes
HOSTNAME=newHostName

and:

$ vi /etc/hosts

127.0.0.1 newHostName
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

and then rebooting the system

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