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Yes, the nova-compute service has to run on a domU.
You need to install XenServer's plugins on dom0 (have a look here:
http://wiki.openstack.org/XenServerDevelopment).
The domU will tell the dom0 to deploy images via xenapi.
You need to extract you vhd image, rename it image.vhd and then gzip it.
Glance plugin on XenServer expect vhd images to be gzipped, so if you
don't compress them the deploy process will fail.

Cheers,
Giuseppe






2011/10/26 Roberto Dalas Z. Benavides <betodalas at gmail.com>:
> A doubt, the new server, compute, must be within a XenServer virtual
> machine?
> The image must actually be as gzip, or you can get on the same Glance as
> vhd?
>
> 2011/10/26 Giuseppe Civitella <giuseppe.civitella at gmail.com>
>>
>> Hi,
>>
>> did you check what happens on XenServer's dom0?
>> Are there some pending gzip processes?
>> Deploy of vhd images can fail if they're are not properly created.
>> You can find the rigth procedure here:
>> https://answers.launchpad.net/nova/+question/161683
>>
>> Hope it helps
>> Giuseppe
>>
>>
>>
>> 2011/10/26 Roberto Dalas Z. Benavides <betodalas at gmail.com>:
>> > Hello, I installed Compute and New Glance a separate server. I'm trying
>> > to
>> > create VM on Xen by Dashboard. The panel is the pending status logs and
>> > shows that XenServer's picking up the image of the Glance, but the
>> > machine
>> > is not created. Follow the log:
>> >
>> >
>> > [20111024T14:18:04.052Z|debug|xenserver-opstack|746566|Async.host.call_plugin
>> > R:cdbc860b307a|audit] Host.call_plugin host =
>> > '9b3736e1-18ef-4147-8564-a9c64ed3
>> > 4f1b (xenserver-opstack)'; plugin = 'glance'; fn = 'download_vhd'; args
>> > = [
>> > params: (dp0
>> > S'auth_token'
>> > p1
>> > NsS'glance_port'
>> > p2
>> > I9292
>> > sS'uuid_stack'
>> > p3
>> > (lp4
>> > S'a343ec2f-ad1c-4632-b7d9-1add8051c241'
>> > p5
>> > aS'4b27c364-6626-4541-896a-65fb0d0b01d3'
>> > p6
>> > asS'image_id'
>> > p7
>> > S'4'
>> > p8
>> > sS'glance_host'
>> > p9
>> > S'10.168.1.30'
>> > p10
>> > sS'sr_path'
>> > p11
>> > S'/var/run/sr-mount/536897fe-f37b-c2b0-6eb1-4763bb3bd667'
>> > p12
>> > s. ]
>> > [20111024T14:18:24.251Z|
>> > info|xenserver-opstack|746637|Async.host.call_plugin
>> > R:223f6eebc13d|dispatcher] spawning a new thread to handle the current
>> > task
>> > (tr
>> > ackid=a043138728544674d13b8d4a8ff673f7)
>> >
>> > [20111024T14:18:24.251Z|debug|xenserver-opstack|746637|Async.host.call_plugin
>> > R:223f6eebc13d|audit] Host.call_plugin host =
>> > '9b3736e1-18ef-4147-8564-a9c64ed3
>> > 4f1b (xenserver-opstack)'; plugin = 'xenhost'; fn = 'host_data'; args =
>> > [ ]
>> > [20111024T14:18:24.402Z|debug|xenserver-opstack|746640 unix-RPC||cli] xe
>> > host-list username=root password=null
>> >
>> > Follow the nova.conf:
>> >
>> > --dhcpbridge_flagfile=/etc/nova/nova.conf
>> > --dhcpbridge=/usr/bin/nova-dhcpbridge
>> > --logdir=/var/log/nova
>> > --state_path=/var/lib/nova
>> > --lock_path=/var/lock/nova
>> > --verbose
>> >
>> > #--libvirt_type=xen
>> > --s3_host=10.168.1.32
>> > --rabbit_host=10.168.1.32
>> > --cc_host=10.168.1.32
>> > --ec2_url=http://10.168.1.32:8773/services/Cloud
>> > --fixed_range=192.168.1.0/24
>> > --network_size=250
>> > --ec2_api=10.168.1.32
>> > --routing_source_ip=10.168.1.32
>> > --verbose
>> > --sql_connection=mysql://root:status64@10.168.1.32/nova
>> > --network_manager=nova.network.manager.FlatManager
>> > --glance_api_servers=10.168.1.32:9292
>> > --image_service=nova.image.glance.GlanceImageService
>> > --flat_network_bridge=xenbr0
>> > --connection_type=xenapi
>> > --xenapi_connection_url=https://10.168.1.31
>> > --xenapi_connection_username=root
>> > --xenapi_connection_password=status64
>> > --reboot_timeout=600
>> > --rescue_timeout=86400
>> > --resize_confirm_window=86400
>> > --allow_resize_to_same_host
>> >
>> > New log-in information compute.log shows cpu, memory, about Xen Sevres,
>> > but
>> > does not create machines.
>> >
>> > Thanks
>> > _______________________________________________
>> > Openstack-operators mailing list
>> > Openstack-operators at lists.openstack.org
>> > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
>> >
>> >
>
>