@@ -25,6 +25,7 @@ If you cannot or do not want to use the "official" kernels,

 here is some technical background about the features (both optional and

 mandatory) that docker needs to run successfully.

+

 Linux version 3.8 or above

 --------------------------

@@ -39,6 +40,15 @@ The symptoms include:

 - kernel crash causing the machine to freeze for a few minutes, or even

   completely.

+Additionally, kernels prior 3.4 did not implement ``reboot_pid_ns``,

+which means that the ``reboot()`` syscall could reboot the host machine,

+instead of terminating the container. To work around that problem,

+LXC userland tools (since version 0.8) automatically drop the ``SYS_BOOT``

+capability when necessary. Still, if you run a pre-3.4 kernel with pre-0.8

+LXC tools, be aware that containers can reboot the whole host! This is

+not something that Docker wants to address in the short term, since you

+shouldn't use kernels prior 3.8 with Docker anyway.

+

 While it is still possible to use older kernels for development, it is

 really not advised to do so.