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The reboot() syscall is allowed by new kernels for LXC containers. The LXC controller can detect whether a reboot was requested (instead of a normal shutdown) by looking at the "init" process exit status. If a reboot was triggered, the exit status will record SIGHUP as the kill reason. The LXC controller has cleared all its capabilities, and the veth network devices will no longer exist at this time. Thus it cannot restart the container init process itself. Instead it emits an event which is picked up by the LXC driver in libvirtd. This will then re-create the container, using the same configuration as it was previously running with (ie it will not activate 'newDef'). Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>