On 12/20/2016 12:48 PM, Jason Miesionczek wrote: > Hi, > > So I see that when i have a qemu vm running, that i created via libvirt, > there is a socket here: > /var/lib/libvirt/qemu/domain-<name>/monitor.sock > > I am trying to connect to this socket via cli or a completely separate > C/C++ application to be able to control the VM, but I can't seem to get it > to work. > > Does anyone know if/how this is possible? Not by connecting directly to the socket, but you CAN use libvirt-qemu.so, which provides the virDomainQemuMonitorCommand() API (also conveniently exposed to shell programming via 'virsh qemu-monitor-command') to do what you want. > > I've tried 'nc', 'socat', and based on the qemu libvirt code, > 'socket'/'connect', but nothing seems to work. Going behind libvirt's back and trying to use the same socket that libvirt is using will never work. But going through libvirt's API should work (we document that use of libvirt-qemu.so is explicitly unsupported, not because it doesn't work, but because it is powerful enough to let you change state of the VM behind libvirt's back in ways that libvirt can't cope with - but as long as you use it for safe actions only, such as QMP commands starting with query-, you should be fine). Ideally, however, if there's something you can currently only accomplish by using libvirt-qemu.so, we should really enhance libvirt to natively provide that through supported APIs that belong to libvirt.so. > > Also, is it possible through libvirt, when creating a qemu VM, one can > specify to enable the QMP socket? Libvirt creates a QMP socket already. If you're asking if it is possible to create a second QMP socket for use in parallel with libvirt's socket, it might be possible using <qemu:commandline> XML in your domain description; but in general, it's usually sufficient to rely on virDomainQemuMonitorCommand() instead of needing a second QMP monitor. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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