Though for most of us checkpoint/restart is the least interesting feature about OpenVZ. We'd just hope for a usable container solution which is both root save and has decent userspace tool support, AND a method to join the container from the host! Most of where LXC is just crap.
Beside that, nothing fancy like container in container support, or anything else, just a way to easily separate services on linux, like solaris zones. The thing that makes me sad is, that imho 95% of the infrastructure is already in place in the linux kernel for basic and secure container. And currently there are only out of tree implementation making it usable, openvz and oracle (solaris) zones, afaik in their kernel.
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