How to change hostname of a server
    Simply ssh as root and type
hostname s1.boxintense.com
Then to make it permanent, modify this file via vi
vi /etc/sysconfig/network
vi /etc/hosts
Press key i to insert text, and then Esc key and :wq to save.
Change a server's hostname
- Using a text editor, open the server's /etc/sysconfig/network file. ...
 
- Modify the HOSTNAME= value to match your FQDN hostname. ...
 
- For internal networking, change the host that is associated with the main IP address for your server (found at /etc/hosts). ...
 
- Run the hostname command.
 
 
    
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                     Why my drive is slow
                
                First, check to make sure write cache is enabled. On Centos, you type
hdparm -I /dev/sda
Then...