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@@ -25,6 +25,7 @@ If you cannot or do not want to use the "official" kernels,
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here is some technical background about the features (both optional and
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mandatory) that docker needs to run successfully.
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+
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Linux version 3.8 or above
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--------------------------
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@@ -39,6 +40,15 @@ The symptoms include:
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- kernel crash causing the machine to freeze for a few minutes, or even
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completely.
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+Additionally, kernels prior 3.4 did not implement ``reboot_pid_ns``,
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+which means that the ``reboot()`` syscall could reboot the host machine,
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+instead of terminating the container. To work around that problem,
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+LXC userland tools (since version 0.8) automatically drop the ``SYS_BOOT``
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+capability when necessary. Still, if you run a pre-3.4 kernel with pre-0.8
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+LXC tools, be aware that containers can reboot the whole host! This is
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+not something that Docker wants to address in the short term, since you
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+shouldn't use kernels prior 3.8 with Docker anyway.
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+
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While it is still possible to use older kernels for development, it is
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really not advised to do so.
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Victor Vieux