[libvirt-users] bridge could not be initialized

[Laine Stump]

On 06/18/2014 04:43 PM, abhishek jain wrote:
> Hi
>
> I'm trying to run VM using libvirt.xml file and getting following error...
>
> virsh start instance-00000003
>
> error: Failed to start domain instance-00000003
> error: internal error Process exited while reading console log output:
> failed to launch bridge helper
> kvm: -netdev bridge,br=qbr1f2191ce-38,id=hostnet0: Device 'bridge'
> could not be initialized

1) The qemu "bridge helper" is only used if you are running virsh as a
non-privileged user (i.e. non-root). Are you sure that's what you want
to do? If that really is the proper thing to do, the bridge device would
need to exist in advance of starting the domain, and you would have to
read up on the qemu bridge helper to learn how to setup ACLs such that
the uid you are using to start the domain have permission to use the
bridge helper (not using it myself, I don't have a pointer to that info
handy, but Google is your friend :-)

2) it looks like this config was generated by OpenStack. Why are you
starting it via virsh? I don't use OpenStack myself, but am assuming
that a lot of the objects referenced in an OpenStack-generated libvirt
domain config are auto-created by some piece of OpenStack code just
prior to starting the domain. For example, the bridge device (there is a
separate bridge device created per guest interface) and the filter that
is applied to that interface (likewise). I was of the impression that
OpenStack instances needed to be started from some sort of OpenStack
management app, *not* from virsh.

>
>
> Below is the libvirt.xml file..
>
> domain type="kvm">
>   <uuid>d9f007b9-584f-41c8-a706-e096f354575b</uuid>
>   <name>instance-00000003</name>
>   <memory>524288</memory>
>   <vcpu>1</vcpu>
>   <os>
>     <type>hvm</type>
>    
> <kernel>/opt/stack/data/nova/instances/d9f007b9-584f-41c8-a706-e096f354575b/kernel</kernel>
>    
> <initrd>/opt/stack/data/nova/instances/d9f007b9-584f-41c8-a706-e096f354575b/ramdisk</initrd>
>     <cmdline>root=/dev/vda console=tty0 console=ttyS0</cmdline>
>   </os>
>   <features>
>     <acpi/>
>     <apic/>
>   </features>
>   <clock offset="utc">
>     <timer name="pit" tickpolicy="delay"/>
>     <timer name="rtc" tickpolicy="catchup"/>
>   </clock>
>   <devices>
>     <disk type="file" device="disk">
>       <driver name="qemu" type="qcow2" cache="none"/>
>       <source
> file="/opt/stack/data/nova/instances/d9f007b9-584f-41c8-a706-e096f354575b/disk"/>
>       <target bus="virtio" dev="vda"/>
>     </disk>
>     <interface type="bridge">
>       <mac address="fa:16:3e:26:55:ff"/>
>       <model type="virtio"/>
>       <source bridge="qbr1f2191ce-38"/>
>       <target dev="tap1f2191ce-38"/>
>       <filterref filter="nova-instance-instance-00000003-fa163e2655ff"/>
>     </interface>
>     <serial type="file">
>       <source
> path="/opt/stack/data/nova/instances/d9f007b9-584f-41c8-a706-e096f354575b/console.log"/>
>     </serial>
>     <serial type="pty"/>
>   </devices>
> </domain>
>
>
> Please help regarding this.
>
> Thanks
> Abhishek Jain
>
>
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