Hostname Change
There are 4 steps in a hostname change, luckily all the steps are easy.Sysconfig/Network
Open the /etc/sysconfig/network file with your favorite text editor. Modify the HOSTNAME= value to match your FQDN host name.Hosts File
Change the host that is associated to your main IPaddress for your server, this is for internal networking (found at /etc/hosts):Run Hostname
The 'hostname' command will let you change the hostname on the server that the commandline remembers, but it will not actively update all programs that are running under the old hostname.Restart Networking
At this point all the necessary changes that needed to be made have been made, you will want to restart networking on your server to make sure that changes will be persistent on reboot:# /etc/init.d/network restart
Now RESTART the CENTOS.
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