How to change the UUID of a Linux(Cent OS/RHEL) ESXi guest machine??

First of all enable ssh service of the host server machine and shutdown the host Cent Os/RHEL machine.

After logging into the host server execute the following commands:-

vi vmInventory.xml

In this entry try find out our machine entry. It should be like this

/vmfs/volumes/5487534f-17adbf16-3578-20256474e0d2/mn01/mn01.vmx

after getting this file you have to edit 

bios.uuid="your desired uuid"

Now restart your guest ..

You are Done. 

check your UUID by 

dmidecode  | grep UUID