Re: [libvirt-users] Using Openvswitch and qemu:///session
On Wed, 23 Mar 2016 13:07:12 -0400
Laine Stump wrote:
What you're trying to do isn't supported and won't work.
the
qemu:///session libvirtd runs as a normal user, and doesn't have the
necessary permissions to create tap devices or connect them to either
Linux host bridges or OVS bridges. qemu added the "qemu-bridge-helper"
which is a suid binary that will create a tap device and connect it to
the named Linux host bridge, and the person who wrote that helper also
made a patch to libvirt to automatically call the qemu-bridge-helper
when a request is made in a qemu:///session guest to connect to a
bridge. Unfortunately, qemu-bridge-helper only knows how to connect to
standard Linux host bridges, it knows nothing about OVS.
Thank you, that answers my questions pretty thoroughly :)
I believe there is an OVS compatibility module that makes the ioctl
used
to connect a tap device to a host bridge also work for OVS bridges. You
may want to look into that.
<snip>
Br-compat module was removed from OVS few releases ago, IIRC, since
libvirt and KVM/QEMU can use Openvswitch bridges natively now.
And it works just fine, just not for my use case :)
Thanks again for the information on inner workings of user session, now I know what I have
to do.
Luckily, I don't have that much domains to migrate.
Pedja