[Pkg-libvirt-maintainers] Bug#520088: Bug#520088: virt-manager: adding additional network adapter - inconsistency between libvirt and xend

[Andreas Unterkircher]

> Could you try to reproduce this behaviour with virsh instead of
> virt-manager? You can add new interfaces with attach-interface. This
> might be a bug in libvirt not in virt-manager itself.

I tried that now by adding an interface with virsh and powered the 
domain up:


virsh # attach-interface app-vmtest-02 bridge virbr1
Interface attached successfully

virsh # start app-vmtest-02
Domain app-vmtest-02 started


The XML dump still contains just one network interface:


<domain type='xen' id='67'>
   <name>app-vmtest-02</name>
   <uuid>3a0e5f42-8f84-87ac-bd7d-dc64243b1e14</uuid>
   <memory>524288</memory>
   <currentMemory>524288</currentMemory>
   <vcpu>1</vcpu>
   <os>
     <type>hvm</type>
     <loader>/usr/lib/xen/boot/hvmloader</loader>
     <boot dev='hd'/>
   </os>
   <features>
     <pae/>
   </features>
   <clock offset='localtime'/>
   <on_poweroff>destroy</on_poweroff>
   <on_reboot>restart</on_reboot>
   <on_crash>restart</on_crash>
   <devices>
     <emulator>/usr/lib64/xen/bin/qemu-dm</emulator>
     <disk type='file' device='disk'>
       <driver name='file'/>
       <source file='/srv/guests/bunch1/app-vmtest-02.img'/>
       <target dev='hda' bus='ide'/>
     </disk>
     <interface type='bridge'>
       <mac address='52:54:00:d8:65:c9'/>
       <source bridge='virbr1'/>
       <target dev='vif67.1'/>
     </interface>
     <serial type='pty'>
       <source path='/dev/pts/6'/>
       <target port='0'/>
     </serial>
     <console type='pty' tty='/dev/pts/6'>
       <source path='/dev/pts/6'/>
       <target port='0'/>
     </console>
     <input type='tablet' bus='usb'/>
     <input type='mouse' bus='ps2'/>
     <graphics type='vnc' port='5905' autoport='no' listen='127.0.0.1' 
keymap='en-us'/>
   </devices>
</domain>


The corresponding domain file in /var/lib/xend/domains got the second
interface as it was told:

     (device
         (vif
             (bridge br0)
             (mac 00:16:36:49:d2:dc)
             (script vif-bridge)
             (uuid 130ee858-ca90-4d16-9be2-3b3e36f54f2a)
             (backend 0)
         )
     )
     (device
         (vif
             (bridge virbr1)
             (mac 52:54:00:d8:65:c9)
             (script vif-bridge)
             (uuid 0bdde717-9966-e85c-1cdb-8e3b4f9e5f09)
             (backend 0)
         )
     )


As libvirt does not report back the additional interface, also 
virt-manager does not know about. And - as soon as I delete the first 
interface (here bridge br0) via virt-manager - also virbr1 gets removed 
from the xend domain file (I guess it gets rewritten then...).


Cheers,
Andreas