On 08/21/2014 06:11 AM, Michal Witanowski wrote: > Hi all, > > Is there any possibility (using libvirt C API or whatever else) to > "propagate" shutdown events (reboot, halt, power off) to a host? The API > seems to lack this functionality - there exists function > virConnectDomainEventRegisterAny, but the virDomainEventStoppedDetailType > enum does not distinguish between these 3 different situations. In the host, it's possible to register a domain lifecycle callback with virConnectDomainEventRegisterAny(), and then if that callback is triggered because the guest shut down, the host can take action such as requesting a host shutdown. You'd have to supply the callback that does this (it would be a security issue if a guest action could shut down the host by default, without the use of a callback installed specifically for this reason). > > Moreover, while rebooting a machine, an additional argument can be passed to > reboot() syscall, which will be used by bootloader during the startup. > Ideally, when calling e.g. "reboot recovery" inside an lxc container I'd > like to be informed (inside host) that "reboot" was called with "recovery" > as additional argument, so I can take appropriate actions. Right now, this level of detail is not wired up. However, the callback signature does support a reason field, so you are welcome to write a libvirt patch that adds a new reason field and figures how to wire a guest recovery reboot into reporting a different reason than the default. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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