Gone from the website ...
Thanks: Stephen Kitt
LWN has a useful and relatively recent introduction to Clear
Containers \url{https://lwn.net/Articles/644675/}.
-If you download the Intel Clear Containers demo
-(\url{https://download.clearlinux.org/demos/containers/clear-containers-demo.tar.xz}),
-unpack it and run \texttt{bash~./boot.sh} then it will boot into a
+Until recently Intel hosted a Clear Containers demo. If you
+downloaded it and ran \texttt{bash~./boot.sh} then it booted into a
full Linux VM in about 150ms, and using 20~MB of RAM.
Intel are using this technology along with a customized Docker driver