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How to rename Linux Hostname

CentOS:

Logon to server via putty
Type      vi /etc/hosts      Enter
Press     I
Rename machine and Press escape press Shift colon
Type   wq!      Enter
Type   vi /etc/sysconfig/network   enter
Press i
Rename machine and Press escape press Shift colon
Type   wq!      Enter
service network restart
chkconfig network on
If you want to reboot the server type    init  6
 
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Ubuntu:
sudo vim /etc/hostname

Press     I
Rename machine and Press escape press Shift colon
Type   wq!      Enter
Sudo reboot


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