CoreOS
http://linux.softpedia.com/get/Linux-Distributions/CoreOS-103458.shtml#download




CoreOS is an open source software project that provides system administrators and experienced users with a  modern and minimal operating system designed for massive server deployments. It is not based on any existing distribution of Linux and features the latest Linux kernel and Docker technologies for enabling warehouse-scale computing with minimum effort as possible.

Great availability, amazing technologies

The product is distributed as a standard ISO image, which can be burned onto a CD disc or written on a USB flash drive in order to boot it from the BIOS of a PC and install the operating system (detailed installation instructions are provided on the project's homepage).