Xen devel - Jun 2006 - Re: [Xen-users] Error: Device 0 (vif) could not be connected. Backend device not found.

I am having the same problem, however on RHEL 2.6.16. 
I have tried setting up the bridge manually but it does not work. 
Can someone give some clues on what we should do to solve this problem in RHEL

Thanks
P. Krishna
-------------- Original message -------------- 
From: Jens Nachtigall <nachtigall@web.de> 
> I found this at http://julien.danjou.info/xen.html 
> 
> Set up the bridge 
> =-=-=-=-=-=-=-=-=-=-=-=- 
> By default the Debian Xen package does not modify your network
configuration.
> You will have to add a bridge to your /etc/network/interfaces file. 
> auto br-xen 
> iface br-xen inet static 
> address 192.168.12.25 
> netmask 255.255.255.0 
> gateway 192.168.12.1 
> bridge_ports eth0 
> # optional 
> bridge_maxwait 0 
> 
> Doing an "ifup br-xen" it I can boot my xen image. Strange seems
to be a bug
> that this is not handled automatically by xen-tools. 
> 
> Am Sonntag, 18. Juni 2006 20:29 schrieb Jens Nachtigall: 
> > Hi all, 
> > 
> > I setup X en3 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 
& gt; > /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-stat us 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} [20 06-06-18 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.Xen dDomainInfo] 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/hotp lug-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 
> > 
> > 
> > _______________________________________________ 
> > Xen-users mailing list 
> > Xen-users@lists.xensource.com 
> > http://lists.xensource.com/xen-users 
> 
> -- 
> jabber-chat: nachtigall@amessage.de 
> 
> 
> _______________________________________________ 
> Xen-users mailing list 
> Xen-users@lists.xensource.com 
> http://lists.xensourc e.com/xen-users 

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