LXC isn't a 'feature of the linux kernel' it's a user land library that uses a set of linux kernel features (e.g. cgroups, namespaces, etc) to expose an api for

LXC isn't a 'feature of the linux kernel' it's a user land library that uses a set of linux kernel features (e.g. cgroups, namespaces, etc) to expose an api for creating system containers. LXC isn't part of the kernel. Docker's default driver has been libcontainer, not LXC, for almost a year. libcontainer implements Docker's execution driver api and works with the various linux kernel features needed to implement containers directly, it doesn't use LXC at all. Docker isn't based on nor reliant on LXC in any way anymore and with the execution driver api is designed to run on various platforms.