[Xen-users] Error: Device 0 (vif) could not be connected. Backend device not found.

[Jens Nachtigall <nachtigall@xxxxxx>]

Hi all,

I setup Xen3 for the first time using debian etch packages as described at 
http://www.debian-administration.org/articles/396 . That is I used the 
Debian xen-create-image to set up a Xen image.

This all went fine, without errors (I can also mount and chroot into the 
image without problems). But when I run

# xm create gerd.cfg -c
Using config file "/etc/xen/gerd.cfg".
Error: Device 0 (vif) could not be connected. Backend device not found.


I do not know what causes this. After some fiddling and searching it 
seems to me like a problem in /etc/xen/scripts/vif-bridge
But I miss the knowhow to tell what exactly goes wrong.

Here is the from daemon.log when I run "xm create gerd.cfg -c" :

/etc/xen/scripts/block: add XENBUS_PATH=backend/vbd/4/2049
/etc/xen/scripts/block: add XENBUS_PATH=backend/vbd/4/2050
/etc/xen/scripts/vif-bridge: online XENBUS_PATH=backend/vif/4/0
/etc/xen/scripts/vif-bridge: Writing backend/vif/4/0/hotplug-status error to 
xenstore.
/etc/xen/scripts/vif-bridge: Could not find bridge, and none was specified
/etc/xen/scripts/vif-bridge: offline XENBUS_PATH=backend/vif/4/0
/etc/xen/scripts/vif-bridge: Writing backend/vif/4/0/hotplug-status error to 
xenstore.
/etc/xen/scripts/vif-bridge: Could not find bridge, and none was specified
/etc/xen/scripts/xen-hotplug-cleanup: XENBUS_PATH=backend/vif/4/0
/etc/xen/scripts/block: Writing backend/vbd/4/2049/node /dev/loop1 to xenstore.
/etc/xen/scripts/block: Writing backend/vbd/4/2049/physical-device 7:1 to 
xenstore.
/etc/xen/scripts/block: Writing backend/vbd/4/2049/hotplug-status connected to 
xenstore.
/etc/xen/scripts/block: remove XENBUS_PATH=backend/vbd/4/2049
/etc/xen/scripts/xen-hotplug-cleanup: XENBUS_PATH=backend/vbd/4/2049
/etc/xen/scripts/block: Writing backend/vbd/4/2050/node /dev/loop1 to xenstore.
/etc/xen/scripts/block: Writing backend/vbd/4/2050/physical-device 7:1 to 
xenstore.
/etc/xen/scripts/block: Writing backend/vbd/4/2050/hotplug-status connected to 
xenstore.
/etc/xen/scripts/block: remove XENBUS_PATH=backend/vbd/4/2050
/etc/xen/scripts/xen-hotplug-cleanup: XENBUS_PATH=backend/vbd/4/2050

Here is what xend.log says when I run "xm create gerd.cfg -c" :

[2006-06-18 20:25:39 xend.XendDomainInfo] DEBUG (XendDomainInfo:178) 
XendDomainInfo.create(['vm', ['name', 'gerd'], ['memory', 196], ['vcpus', 1], 
['image', ['linux', ['kernel', '/boot/vmlinuz-2.6.16-2-xen-686'], ['ramdisk', 
'/boot/initrd.img-2.6.16-2-xen-686'], ['root', '/dev/sda1 ro']]], ['device', 
['vbd', ['uname', 'file:/home/xen/domains/gerd/disk.img'], ['dev', 'sda1'], 
['mode', 'w']]], ['device', ['vbd', ['uname', 
'file:/home/xen/domains/gerd/swap.img'], ['dev', 'sda2'], ['mode', 'w']]], 
['device', ['vif', ['ip', '192.168.10.70']]]])
[2006-06-18 20:25:39 xend.XendDomainInfo] DEBUG (XendDomainInfo:284) 
parseConfig: config is ['vm', ['name', 'gerd'], ['memory', 196], ['vcpus', 1], 
['image', ['linux', ['kernel', '/boot/vmlinuz-2.6.16-2-xen-686'], ['ramdisk', 
'/boot/initrd.img-2.6.16-2-xen-686'], ['root', '/dev/sda1 ro']]], ['device', 
['vbd', ['uname', 'file:/home/xen/domains/gerd/disk.img'], ['dev', 'sda1'], 
['mode', 'w']]], ['device', ['vbd', ['uname', 
'file:/home/xen/domains/gerd/swap.img'], ['dev', 'sda2'], ['mode', 'w']]], 
['device', ['vif', ['ip', '192.168.10.70']]]]
[2006-06-18 20:25:39 xend.XendDomainInfo] DEBUG (XendDomainInfo:380) 
parseConfig: result is {'ssidref': None, 'uuid': None, 'on_crash': None, 
'on_reboot': None, 'image': ['linux', ['kernel', 
'/boot/vmlinuz-2.6.16-2-xen-686'], ['ramdisk', 
'/boot/initrd.img-2.6.16-2-xen-686'], ['root', '/dev/sda1 ro']], 'on_poweroff': 
None, 'cpus': None, 'name': 'gerd', 'backend': [], 'vcpus': 1, 'cpu_weight': 
None, 'vcpu_avail': None, 'memory': 196, 'device': [('vbd', ['vbd', ['uname', 
'file:/home/xen/domains/gerd/disk.img'], ['dev', 'sda1'], ['mode', 'w']]), 
('vbd', ['vbd', ['uname', 'file:/home/xen/domains/gerd/swap.img'], ['dev', 
'sda2'], ['mode', 'w']]), ('vif', ['vif', ['ip', '192.168.10.70']])], 
'bootloader': None, 'cpu': None, 'maxmem': None}
[2006-06-18 20:25:39 xend.XendDomainInfo] DEBUG (XendDomainInfo:1164) 
XendDomainInfo.construct: None 0
[2006-06-18 20:25:39 xend.XendDomainInfo] DEBUG (XendDomainInfo:1196) 
XendDomainInfo.initDomain: 5 1.0
[2006-06-18 20:25:39 xend] DEBUG (balloon:126) Balloon: free 197; need 197; 
done.
[2006-06-18 20:25:39 xend] INFO (image:135) buildDomain os=linux dom=5 vcpus=1
[2006-06-18 20:25:39 xend] DEBUG (image:173) dom            = 5
[2006-06-18 20:25:39 xend] DEBUG (image:174) image          = 
/boot/vmlinuz-2.6.16-2-xen-686
[2006-06-18 20:25:39 xend] DEBUG (image:175) store_evtchn   = 1
[2006-06-18 20:25:39 xend] DEBUG (image:176) console_evtchn = 2
[2006-06-18 20:25:39 xend] DEBUG (image:177) cmdline        =  root=/dev/sda1 ro
[2006-06-18 20:25:39 xend] DEBUG (image:178) ramdisk        = 
/boot/initrd.img-2.6.16-2-xen-686
[2006-06-18 20:25:39 xend] DEBUG (image:179) vcpus          = 1
[2006-06-18 20:25:39 xend] DEBUG (image:180) features       =
[2006-06-18 20:25:39 xend] DEBUG (blkif:24) exception looking up device number 
for sda1: [Errno 2] No such file or directory: '/dev/sda1'
[2006-06-18 20:25:39 xend] DEBUG (DevController:103) DevController: writing 
{'virtual-device': '2049', 'backend-id': '0', 'state': '1', 'backend': 
'/local/domain/0/backend/vbd/5/2049'} to /local/domain/5/device/vbd/2049.
[2006-06-18 20:25:39 xend] DEBUG (DevController:105) DevController: writing 
{'domain': 'gerd', 'frontend': '/local/domain/5/device/vbd/2049', 'dev': 
'sda1', 'state': '1', 'params': '/home/xen/domains/gerd/disk.img', 'mode': 'w', 
'frontend-id': '5', 'type': 'file'} to /local/domain/0/backend/vbd/5/2049.
[2006-06-18 20:25:39 xend] DEBUG (blkif:24) exception looking up device number 
for sda2: [Errno 2] No such file or directory: '/dev/sda2'
[2006-06-18 20:25:39 xend] DEBUG (DevController:103) DevController: writing 
{'virtual-device': '2050', 'backend-id': '0', 'state': '1', 'backend': 
'/local/domain/0/backend/vbd/5/2050'} to /local/domain/5/device/vbd/2050.
[2006-06-18 20:25:39 xend] DEBUG (DevController:105) DevController: writing 
{'domain': 'gerd', 'frontend': '/local/domain/5/device/vbd/2050', 'dev': 
'sda2', 'state': '1', 'params': '/home/xen/domains/gerd/swap.img', 'mode': 'w', 
'frontend-id': '5', 'type': 'file'} to /local/domain/0/backend/vbd/5/2050.
[2006-06-18 20:25:39 xend] DEBUG (DevController:103) DevController: writing 
{'backend-id': '0', 'mac': '00:16:3e:1d:35:5a', 'handle': '0', 'state': '1', 
'backend': '/local/domain/0/backend/vif/5/0'} to /local/domain/5/device/vif/0.
[2006-06-18 20:25:39 xend] DEBUG (DevController:105) DevController: writing 
{'domain': 'gerd', 'handle': '0', 'script': '/etc/xen/scripts/vif-bridge', 
'ip': '192.168.10.70', 'state': '1', 'frontend': 
'/local/domain/5/device/vif/0', 'mac': '00:16:3e:1d:35:5a', 'frontend-id': '5'} 
to /local/domain/0/backend/vif/5/0.
[2006-06-18 20:25:39 xend.XendDomainInfo] DEBUG (XendDomainInfo:671) Storing VM 
details: {'ssidref': '0', 'uuid': '324c5b66-049e-b6c0-28d7-35a3b4a94817', 
'on_reboot': 'restart', 'start_time': '1150655139.67', 'on_poweroff': 
'destroy', 'name': 'gerd', 'vcpus': '1', 'vcpu_avail': '1', 'memory': '196', 
'on_crash': 'restart', 'image': "(linux (kernel /boot/vmlinuz-2.6.16-2-xen-686) 
(ramdisk /boot/initrd.img-2.6.16-2-xen-686) (root '/dev/sda1 ro'))", 'maxmem': 
'196'}
[2006-06-18 20:25:39 xend.XendDomainInfo] DEBUG (XendDomainInfo:696) Storing 
domain details: {'console/ring-ref': '197261', 'console/port': '2', 'name': 
'gerd', 'console/limit': '1048576', 'vm': 
'/vm/324c5b66-049e-b6c0-28d7-35a3b4a94817', 'domid': '5', 'cpu/0/availability': 
'online', 'memory/target': '200704', 'store/ring-ref': '197262', 'store/port': 
'1'}
[2006-06-18 20:25:39 xend.XendDomainInfo] DEBUG (XendDomainInfo:877) 
XendDomainInfo.handleShutdownWatch
[2006-06-18 20:25:39 xend] DEBUG (DevController:132) Waiting for devices vif.
[2006-06-18 20:25:39 xend] DEBUG (DevController:138) Waiting for 0.
[2006-06-18 20:25:39 xend] DEBUG (DevController:403) hotplugStatusCallback 
/local/domain/0/backend/vif/5/0/hotplug-status.
[2006-06-18 20:25:39 xend] DEBUG (DevController:403) hotplugStatusCallback 
/local/domain/0/backend/vif/5/0/hotplug-status.
[2006-06-18 20:25:39 xend] DEBUG (DevController:417) hotplugStatusCallback 2.
[2006-06-18 20:25:39 xend.XendDomainInfo] DEBUG (XendDomainInfo:1327) 
XendDomainInfo.destroy: domid=5
[2006-06-18 20:25:39 xend.XendDomainInfo] DEBUG (XendDomainInfo:1335) 
XendDomainInfo.destroyDomain(5)


Sorry, but that is a bit too much for a Xen beginner ;-) Your help is very much 
appreciated.

Jens


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