[libvir] How to seek a running QEMU instance

Richard W.M. Jones rjones at redhat.com
Tue Mar 18 18:38:44 UTC 2008

On Tue, Mar 18, 2008 at 05:47:38PM +0300, Anton Protopopov wrote:
> I have the following question. How can virsh (or, more accurately, libvirt)
> detect a running QEMU vm, when latter was already started? For example, I
> have got the following:

As Dan says, it doesn't, but this is kind of a bug in libvirt.

It is in theory possible for libvirt to enumerate running qemu/kvm
instances, eg. by looking at the process table.  But this is rather

A better way would be to allow qemu processes to drop a monitor socket
into a well-known directory; something like:

  qemu -monitor unix:/var/run/libvirt/monitors/<uuid>

(and perhaps wrap this up in a shell script to make it simpler for
users to start their own qemu instances and have them transparently
managed by libvirt).

This would also allow libvirtd to be restarted without killing the
qemu guests (I think ...).


Richard Jones, Emerging Technologies, Red Hat  http://et.redhat.com/~rjones
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into Xen guests.

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