Another example is OpenVZ, which offers an alternative to lxc for Linux. It requires patching the kernel, but is considered solid enough that multiple VPS provi

Another example is OpenVZ, which offers an alternative to lxc for Linux. It requires patching the kernel, but is considered solid enough that multiple VPS providers actually use OpenVZ under the hood. Note: there will probably be an OpenVZ backend available for Docker at some point :)