Freeze SO Linux, it's possible?

[Bart Silverstrim]

Bart Silverstrim wrote:
> Carlos Carrero Gutierrez wrote:
>> Hi, i would like to freeze my linux in order to freeze the OS, then,
>> when I reboot the computer all changes that i made in the computer
>> dissapears and it returns to the previous OS freezed.
>>
>> In windows there is something similar, called "Deep Freeze" (it's
>> freeware).
> 
> If it's freeware it would only be for personal use...we license it and 
> it's definitely not free.

As a side note, no, I've never found similar-type software for Linux to 
"Freeze" it despite looking around. The closest I've come is imaging 
software or using Linux in a virtual machine (like VirtualBox) and using 
snapshots to revert to a previous state.