I have three identical hardware machine. I want to install and configure centos server on all machine. I need to have exactly same configuration. After some research,I know there is a way of making replica after installing in one machine by using bare metal hypervisor but i dont know how? what are the hypervisor used for this and what is the procedure? can we use KVM hypervisor for this purpose?
Since you are going to deploy CentOS on a identical hardware machine, you don't require Hypervisor. In your requirement, you need to just clone the HDD ( identical ), and you can use clonezilla like diskimage or cloning program.
Hypervisor is something different, where you can install multiple operating systems on a single hardware, wherein operating systems runs independetanly, and uses shared CPU,Network, and storage on the server.